RHSA-2026:27729
Vulnerability from csaf_opensuse - Published: 2026-06-22 04:35 - Updated: 2026-09-01 12:03Summary
Red Hat Security Advisory: kernel security, bug fix, and enhancement update
Severity
Critical
Notes
Topic: An update for kernel is now available for Red Hat Enterprise Linux 7 Extended Lifecycle Support.
Red Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* kernel: Linux kernel: Denial of service and memory corruption in RDMA umad (CVE-2026-23243)
* kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err() (CVE-2026-43037)
* kernel: wifi: brcmfmac: validate bsscfg indices in IF events (CVE-2026-43110)
* kernel: netfilter: xt_tcpmss: check remaining length before reading optlen (CVE-2026-43190)
* kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks (CVE-2026-43158)
* kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions (CVE-2026-46243)
Bug Fix(es) and Enhancement(s):
* RHEL-124698 missed the last line of the backport (JIRA:RHEL-168608)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in the Linux kernel's Remote Direct Memory Access (RDMA) `umad` (User Mode Access Device) component. A local user can exploit this vulnerability by manipulating input, causing an integer underflow that leads to an out-of-bounds memory write. This memory corruption can result in a denial of service (DoS) by crashing the system, and may also lead to limited information disclosure or data integrity issues.
7.3 (High)
Affected products
Fixed
93 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 7Server-ELS:bpftool-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-ELS:bpftool-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-ELS:bpftool-0:3.10.0-1160.153.1.el7.s390x | — |
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| Unresolved product id: 7Server-ELS:bpftool-0:3.10.0-1160.153.1.el7.x86_64 | — |
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| Unresolved product id: 7Server-ELS:bpftool-debuginfo-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-ELS:bpftool-debuginfo-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-ELS:bpftool-debuginfo-0:3.10.0-1160.153.1.el7.s390x | — |
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| Unresolved product id: 7Server-ELS:bpftool-debuginfo-0:3.10.0-1160.153.1.el7.x86_64 | — |
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| Unresolved product id: 7Server-ELS:kernel-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-ELS:kernel-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-ELS:kernel-0:3.10.0-1160.153.1.el7.s390x | — |
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| Unresolved product id: 7Server-ELS:kernel-0:3.10.0-1160.153.1.el7.src | — |
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| Unresolved product id: 7Server-ELS:kernel-0:3.10.0-1160.153.1.el7.x86_64 | — |
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| Unresolved product id: 7Server-ELS:kernel-abi-whitelists-0:3.10.0-1160.153.1.el7.noarch | — |
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| Unresolved product id: 7Server-ELS:kernel-bootwrapper-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-ELS:kernel-bootwrapper-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-ELS:kernel-debug-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-ELS:kernel-debug-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-ELS:kernel-debug-0:3.10.0-1160.153.1.el7.s390x | — |
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| Unresolved product id: 7Server-ELS:kernel-debug-0:3.10.0-1160.153.1.el7.x86_64 | — |
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| Unresolved product id: 7Server-ELS:kernel-debug-debuginfo-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-ELS:kernel-debug-debuginfo-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-ELS:kernel-debug-debuginfo-0:3.10.0-1160.153.1.el7.s390x | — |
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| Unresolved product id: 7Server-ELS:kernel-debug-debuginfo-0:3.10.0-1160.153.1.el7.x86_64 | — |
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| Unresolved product id: 7Server-ELS:kernel-debug-devel-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-ELS:kernel-debug-devel-0:3.10.0-1160.153.1.el7.s390x | — |
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| Unresolved product id: 7Server-ELS:kernel-debug-devel-0:3.10.0-1160.153.1.el7.x86_64 | — |
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| Unresolved product id: 7Server-ELS:kernel-debuginfo-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-ELS:kernel-debuginfo-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-ELS:kernel-debuginfo-0:3.10.0-1160.153.1.el7.s390x | — |
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| Unresolved product id: 7Server-ELS:kernel-debuginfo-0:3.10.0-1160.153.1.el7.x86_64 | — |
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| Unresolved product id: 7Server-ELS:kernel-debuginfo-common-ppc64-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-ELS:kernel-debuginfo-common-ppc64le-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-ELS:kernel-debuginfo-common-s390x-0:3.10.0-1160.153.1.el7.s390x | — |
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| Unresolved product id: 7Server-ELS:kernel-debuginfo-common-x86_64-0:3.10.0-1160.153.1.el7.x86_64 | — |
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| Unresolved product id: 7Server-ELS:kernel-devel-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-ELS:kernel-devel-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-ELS:kernel-devel-0:3.10.0-1160.153.1.el7.s390x | — |
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| Unresolved product id: 7Server-ELS:kernel-devel-0:3.10.0-1160.153.1.el7.x86_64 | — |
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| Unresolved product id: 7Server-ELS:kernel-doc-0:3.10.0-1160.153.1.el7.noarch | — |
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| Unresolved product id: 7Server-ELS:kernel-kdump-0:3.10.0-1160.153.1.el7.s390x | — |
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| Unresolved product id: 7Server-ELS:kernel-kdump-debuginfo-0:3.10.0-1160.153.1.el7.s390x | — |
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| Unresolved product id: 7Server-ELS:kernel-kdump-devel-0:3.10.0-1160.153.1.el7.s390x | — |
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| Unresolved product id: 7Server-ELS:kernel-tools-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-ELS:kernel-tools-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-ELS:kernel-tools-0:3.10.0-1160.153.1.el7.x86_64 | — |
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| Unresolved product id: 7Server-ELS:kernel-tools-debuginfo-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-ELS:kernel-tools-debuginfo-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-ELS:kernel-tools-debuginfo-0:3.10.0-1160.153.1.el7.x86_64 | — |
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| Unresolved product id: 7Server-ELS:kernel-tools-libs-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-ELS:kernel-tools-libs-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-ELS:kernel-tools-libs-0:3.10.0-1160.153.1.el7.x86_64 | — |
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| Unresolved product id: 7Server-ELS:perf-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-ELS:perf-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-ELS:perf-0:3.10.0-1160.153.1.el7.s390x | — |
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| Unresolved product id: 7Server-ELS:perf-0:3.10.0-1160.153.1.el7.x86_64 | — |
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| Unresolved product id: 7Server-ELS:perf-debuginfo-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-ELS:perf-debuginfo-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-ELS:perf-debuginfo-0:3.10.0-1160.153.1.el7.s390x | — |
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| Unresolved product id: 7Server-ELS:perf-debuginfo-0:3.10.0-1160.153.1.el7.x86_64 | — |
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| Unresolved product id: 7Server-ELS:python-perf-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-ELS:python-perf-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-ELS:python-perf-0:3.10.0-1160.153.1.el7.s390x | — |
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| Unresolved product id: 7Server-ELS:python-perf-0:3.10.0-1160.153.1.el7.x86_64 | — |
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| Unresolved product id: 7Server-ELS:python-perf-debuginfo-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-ELS:python-perf-debuginfo-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-ELS:python-perf-debuginfo-0:3.10.0-1160.153.1.el7.s390x | — |
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| Unresolved product id: 7Server-ELS:python-perf-debuginfo-0:3.10.0-1160.153.1.el7.x86_64 | — |
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| Unresolved product id: 7Server-optional-ELS:bpftool-debuginfo-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-optional-ELS:bpftool-debuginfo-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-optional-ELS:bpftool-debuginfo-0:3.10.0-1160.153.1.el7.x86_64 | — |
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| Unresolved product id: 7Server-optional-ELS:kernel-debug-debuginfo-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-optional-ELS:kernel-debug-debuginfo-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-optional-ELS:kernel-debug-debuginfo-0:3.10.0-1160.153.1.el7.x86_64 | — |
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| Unresolved product id: 7Server-optional-ELS:kernel-debug-devel-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-optional-ELS:kernel-debuginfo-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-optional-ELS:kernel-debuginfo-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-optional-ELS:kernel-debuginfo-0:3.10.0-1160.153.1.el7.x86_64 | — |
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| Unresolved product id: 7Server-optional-ELS:kernel-debuginfo-common-ppc64-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-optional-ELS:kernel-debuginfo-common-ppc64le-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-optional-ELS:kernel-debuginfo-common-x86_64-0:3.10.0-1160.153.1.el7.x86_64 | — |
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| Unresolved product id: 7Server-optional-ELS:kernel-tools-debuginfo-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-optional-ELS:kernel-tools-debuginfo-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-optional-ELS:kernel-tools-debuginfo-0:3.10.0-1160.153.1.el7.x86_64 | — |
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| Unresolved product id: 7Server-optional-ELS:kernel-tools-libs-devel-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-optional-ELS:kernel-tools-libs-devel-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-optional-ELS:kernel-tools-libs-devel-0:3.10.0-1160.153.1.el7.x86_64 | — |
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| Unresolved product id: 7Server-optional-ELS:perf-debuginfo-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-optional-ELS:perf-debuginfo-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-optional-ELS:perf-debuginfo-0:3.10.0-1160.153.1.el7.x86_64 | — |
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| Unresolved product id: 7Server-optional-ELS:python-perf-debuginfo-0:3.10.0-1160.153.1.el7.ppc64 | — |
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| Unresolved product id: 7Server-optional-ELS:python-perf-debuginfo-0:3.10.0-1160.153.1.el7.ppc64le | — |
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| Unresolved product id: 7Server-optional-ELS:python-perf-debuginfo-0:3.10.0-1160.153.1.el7.x86_64 | — |
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Threats
Impact
Moderate
A flaw was found in the Linux kernel's IPv6 tunnel implementation. A remote attacker could exploit this flaw by sending malicious ICMPv6 error messages to cause a stack-based buffer overflow in the kernel's IPv4-over-IPv6 tunnel error handling code. This could result in a kernel crash (denial of service) or potentially allow arbitrary code execution with kernel privileges.
8.8 (High)
Affected products
Fixed
93 products, the same list as for
CVE-2026-23243
Threats
Impact
Critical
A flaw was found in the Linux kernel's brcmfmac Wi-Fi driver. This vulnerability occurs because the driver fails to properly validate bsscfg indices in interface (IF) events. An attacker could exploit this by sending a specially crafted IF event with an invalid bsscfg index, which could lead to an out-of-bounds write or read, potentially causing a system crash and resulting in a denial of service (DoS).
7.5 (High)
Affected products
Fixed
93 products, the same list as for
CVE-2026-23243
Threats
Impact
Moderate
A flaw was found in the Linux kernel's XFS filesystem. When adding extended attributes (xattrs), which are metadata associated with files, to leaf blocks, incorrect adjustments to the freemap can occur. This inconsistency allows the entries array and free space to overlap, leading to an assertion failure. A local user can exploit this to cause the filesystem to shut down, resulting in a Denial of Service (DoS).
7.0 (High)
Affected products
Fixed
93 products, the same list as for
CVE-2026-23243
Threats
Impact
Moderate
A flaw was found in the Linux kernel, specifically within the netfilter: xt_tcpmss module. A remote attacker could exploit this vulnerability by sending a specially crafted TCP packet. The TCP option parser does not properly validate the remaining option length, which results in an out-of-bounds read. This allows an attacker to access memory beyond the intended buffer, potentially leading to information disclosure.
7.5 (High)
Affected products
Fixed
93 products, the same list as for
CVE-2026-23243
Threats
Impact
Moderate
A privilege escalation vulnerability was found in the Linux kernel's CIFS client implementation. This could allow a local attacker to impersonate other users, bypass authentication in SMB mount operations, and potentially gain unauthorized access to network file shares or escalate privileges.
7.8 (High)
Affected products
Fixed
93 products, the same list as for
CVE-2026-23243
Threats
Impact
Important
References
41 references
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"text": "An update for kernel is now available for Red Hat Enterprise Linux 7 Extended Lifecycle Support.\n\nRed Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
"title": "Topic"
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"text": "The kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* kernel: Linux kernel: Denial of service and memory corruption in RDMA umad (CVE-2026-23243)\n\n* kernel: ip6_tunnel: clear skb2-\u003ecb[] in ip4ip6_err() (CVE-2026-43037)\n\n* kernel: wifi: brcmfmac: validate bsscfg indices in IF events (CVE-2026-43110)\n\n* kernel: netfilter: xt_tcpmss: check remaining length before reading optlen (CVE-2026-43190)\n\n* kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks (CVE-2026-43158)\n\n* kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions (CVE-2026-46243)\n\nBug Fix(es) and Enhancement(s):\n\n* RHEL-124698 missed the last line of the backport (JIRA:RHEL-168608)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
"title": "Details"
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"name": "Incorrect Calculation of Buffer Size"
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"discovery_date": "2026-03-18T00:00:00+00:00",
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"text": "2448594"
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"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s Remote Direct Memory Access (RDMA) `umad` (User Mode Access Device) component. A local user can exploit this vulnerability by manipulating input, causing an integer underflow that leads to an out-of-bounds memory write. This memory corruption can result in a denial of service (DoS) by crashing the system, and may also lead to limited information disclosure or data integrity issues.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Linux kernel: Denial of service and memory corruption in RDMA umad",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This bug is a kernel out-of-bounds write in the RDMA umad write path caused by a user-controlled length calculation that could underflow and pass an invalid data_len into MAD send buffer creation.\nA local user with access to the umad interface can trigger the issue by supplying mismatched MAD and RMPP header sizes, which leads to an out-of-bounds memset in the send MAD allocation path and can corrupt kernel memory.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-23243"
},
{
"category": "external",
"summary": "RHBZ#2448594",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2448594"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-23243",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-23243"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-23243",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23243"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026031816-CVE-2026-23243-b88e@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026031816-CVE-2026-23243-b88e@gregkh/T"
}
],
"release_date": "2026-03-18T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-22T04:35:46+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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{
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"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.3,
"baseSeverity": "HIGH",
"confidentialityImpact": "LOW",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H",
"version": "3.1"
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{
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"details": "Moderate"
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"title": "kernel: Linux kernel: Denial of service and memory corruption in RDMA umad"
},
{
"cve": "CVE-2026-43037",
"cwe": {
"id": "CWE-843",
"name": "Access of Resource Using Incompatible Type (\u0027Type Confusion\u0027)"
},
"discovery_date": "2026-05-01T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2464351"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s IPv6 tunnel implementation. A remote attacker could exploit this flaw by sending malicious ICMPv6 error messages to cause a stack-based buffer overflow in the kernel\u0027s IPv4-over-IPv6 tunnel error handling code. This could result in a kernel crash (denial of service) or potentially allow arbitrary code execution with kernel privileges.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: ip6_tunnel: clear skb2-\u003ecb[] in ip4ip6_err()",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Critical flaw in the Linux kernel\u0027s IPv6 tunneling error handling can lead to a stack buffer overflow. An unauthenticated remote attacker could exploit this by sending specially crafted network packets, potentially resulting in a denial of service or information disclosure on affected Red Hat Enterprise Linux systems.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-43037"
},
{
"category": "external",
"summary": "RHBZ#2464351",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464351"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-43037",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-43037"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-43037",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43037"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026050102-CVE-2026-43037-0346@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026050102-CVE-2026-43037-0346@gregkh/T"
}
],
"release_date": "2026-05-01T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-22T04:35:46+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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{
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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"details": "Critical"
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"title": "kernel: ip6_tunnel: clear skb2-\u003ecb[] in ip4ip6_err()"
},
{
"cve": "CVE-2026-43110",
"cwe": {
"id": "CWE-1285",
"name": "Improper Validation of Specified Index, Position, or Offset in Input"
},
"discovery_date": "2026-05-06T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2467014"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s brcmfmac Wi-Fi driver. This vulnerability occurs because the driver fails to properly validate bsscfg indices in interface (IF) events. An attacker could exploit this by sending a specially crafted IF event with an invalid bsscfg index, which could lead to an out-of-bounds write or read, potentially causing a system crash and resulting in a denial of service (DoS).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: wifi: brcmfmac: validate bsscfg indices in IF events",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "brcmfmac IF event handling validates the firmware provided ifidx but still uses the raw bsscfgidx value as an index into the driver iflist array. A malformed firmware IF event with an out of range bsscfgidx can cause an out of bounds pointer read and may lead to an invalid pointer dereference or broader memory corruption depending on how the resulting ifp is used. For the CVSS the PR:N is used in the paranoid score because a practical attacker model may involve adjacent Wi-Fi influence over FullMAC firmware events rather than a local privileged user on the host. The issue is not reachable over a normal routed IP network. It is adjacent network or device firmware mediated. Impact is at least denial of service through a kernel crash or Wi-Fi driver failure. In the paranoid case, the unchecked firmware controlled array index potentially could lead to possible confidentiality and integrity impact (but primarily only Availability impact).",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-43110"
},
{
"category": "external",
"summary": "RHBZ#2467014",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467014"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-43110",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-43110"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-43110",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43110"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026050624-CVE-2026-43110-7309@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026050624-CVE-2026-43110-7309@gregkh/T"
}
],
"release_date": "2026-05-06T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-22T04:35:46+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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{
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"attackComplexity": "HIGH",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"title": "kernel: wifi: brcmfmac: validate bsscfg indices in IF events"
},
{
"cve": "CVE-2026-43158",
"cwe": {
"id": "CWE-617",
"name": "Reachable Assertion"
},
"discovery_date": "2026-05-06T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2467210"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s XFS filesystem. When adding extended attributes (xattrs), which are metadata associated with files, to leaf blocks, incorrect adjustments to the freemap can occur. This inconsistency allows the entries array and free space to overlap, leading to an assertion failure. A local user can exploit this to cause the filesystem to shut down, resulting in a Denial of Service (DoS).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A local user with the ability to set extended attributes on an XFS filesystem can trigger inconsistent xattr leaf freemap accounting through crafted xattr insertion patterns. This can cause xattr metadata regions to overlap, leading to filesystem corruption detection and XFS shutdown via a reachable assertion. The issue requires the creation of a specific filesystem metadata layout through repeated setxattr operations.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-43158"
},
{
"category": "external",
"summary": "RHBZ#2467210",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467210"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-43158",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-43158"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-43158",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43158"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026050631-CVE-2026-43158-cc20@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026050631-CVE-2026-43158-cc20@gregkh/T"
}
],
"release_date": "2026-05-06T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-22T04:35:46+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"title": "kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks"
},
{
"cve": "CVE-2026-43190",
"cwe": {
"id": "CWE-125",
"name": "Out-of-bounds Read"
},
"discovery_date": "2026-05-06T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2467064"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel, specifically within the netfilter: xt_tcpmss module. A remote attacker could exploit this vulnerability by sending a specially crafted TCP packet. The TCP option parser does not properly validate the remaining option length, which results in an out-of-bounds read. This allows an attacker to access memory beyond the intended buffer, potentially leading to information disclosure.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: netfilter: xt_tcpmss: check remaining length before reading optlen",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "xt_tcpmss can read one byte past the TCP option boundary when the last option byte is not EOL or NOP. The parser may evaluate op i plus 1 while i is already the final byte of the option area, so a crafted TCP packet can trigger an out of bounds read in the netfilter match path. If the attacker can send packets through a ruleset that uses the tcpmss match, then it can trigger this bug. The issue is network reachable only on systems with an applicable xt_tcpmss or iptables rule, and it is not a generic TCP stack exposure. Impact is primarily limited confidentiality risk from a one byte out of bounds read and possible low availability impact.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-43190"
},
{
"category": "external",
"summary": "RHBZ#2467064",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467064"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-43190",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-43190"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-43190",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43190"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026050642-CVE-2026-43190-f1c9@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026050642-CVE-2026-43190-f1c9@gregkh/T"
}
],
"release_date": "2026-05-06T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-22T04:35:46+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: netfilter: xt_tcpmss: check remaining length before reading optlen"
},
{
"cve": "CVE-2026-46243",
"cwe": {
"id": "CWE-825",
"name": "Expired Pointer Dereference"
},
"discovery_date": "2026-05-26T15:07:49.955000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2481486"
}
],
"notes": [
{
"category": "description",
"text": "A privilege escalation vulnerability was found in the Linux kernel\u0027s CIFS client implementation. This could allow a local attacker to impersonate other users, bypass authentication in SMB mount operations, and potentially gain unauthorized access to network file shares or escalate privileges.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue is classified as Important severity primarily because a low-privileged local user can achieve full privilege escalation to root without any user interaction. The attack requires local access, which prevents remote exploitation and is the primary factor keeping the rating at Important rather than Critical.\n\nExploitation requires three components to be present on the system: the `cifs` kernel module (loaded or loadable), the `cifs-utils` package with its default `cifs.spnego` request-key rule, and the ability to create unprivileged user and mount namespaces. All three must be present for the attack chain to succeed. Environments that do not use SMB/CIFS file shares or Active Directory integration are unlikely to have `cifs-utils` installed, reducing their exposure.\n\nIn OpenShift Container Platform 4, this flaw is rated Low. The default `restricted-v2` Security Context Constraint (SCC) sets `allowPrivilegeEscalation: false` on all pods, which causes the kernel to ignore setuid file bits, preventing privilege escalation. Under non-default SCCs such as `anyuid` that permit privilege escalation, the vulnerability is constrained by PID and mount namespace isolation to the container\u0027s own filesystem. An attacker would only be able to escalate privileges within the container, not on the host or across pods.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-46243"
},
{
"category": "external",
"summary": "RHBZ#2481486",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2481486"
},
{
"category": "external",
"summary": "RHSB-2026-005",
"url": "https://access.redhat.com/security/vulnerabilities/RHSB-2026-005"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-46243",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-46243"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-46243",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46243"
},
{
"category": "external",
"summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3da1fdf4efbc490041eb4f836bf596201203f8f2",
"url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3da1fdf4efbc490041eb4f836bf596201203f8f2"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026060140-CVE-2026-46243-3d1c@gregkh/",
"url": "https://lore.kernel.org/linux-cve-announce/2026060140-CVE-2026-46243-3d1c@gregkh/"
}
],
"release_date": "2026-05-26T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-22T04:35:46+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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