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ALSA-2026:72623 — Important: kernel security, bug fix, and enhancement update

Affected: AlmaLinux:9: kernel, AlmaLinux:9: kernel-64k, AlmaLinux:9: kernel-64k-core, AlmaLinux:9: kernel-64k-debug, AlmaLinux:9: kernel-64k-debug-core, AlmaLinux:9: kernel-64k-debug-devel, AlmaLinux:9: kernel-64k-debug-devel-matched, AlmaLinux:9: kernel-64k-debug-modules, AlmaLinux:9: kernel-64k-debug-modules-core, AlmaLinux:9: kernel-64k-debug-modules-extra and 64 more

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

* kernel: ext4: fix e4b bitmap inconsistency reports (CVE-2026-45942) * kernel: RDMA/rxe: Fix iova-to-va conversion for MR page sizes != PAGE_SIZE (CVE-2026-46325) * kernel: crypto: af_alg - Cap AEAD AD length to 0x80000000 (CVE-2026-52972) * kernel: fhandle: fix UAF due to unlocked ->mnt_ns read in may_decode_fh() (CVE-2026-53341) * kernel: arm64: tlb: Flush walk cache when unsharing PMD tables (CVE-2026-63875) * kernel: RDMA/siw: Reject MPA FPDU length underflow before signed receive math (CVE-2026-64102) * kernel: perf/core: Detach event groups during remove_on_exec (CVE-2026-64556) * kernel: crypto: tegra - fix rctx->cryptlen calculation in tegra_gcm_do_one_req() (CVE-2026-80522) * kernel: perf: Reject exited events as group leaders (CVE-2026-74753)

Bug Fix(es) and Enhancement(s):

* KVM: s390: Limit adapter indicator access to mapped page [almalinux-9.8.z] (JIRA:AlmaLinux-188656) * crypto: xxhash64 should not be fips approved [almalinux-9.8.z] (JIRA:AlmaLinux-256437)

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.

BELL-CVE-2026-53341

Affected: Alpaquita:25: linux-lts, Alpaquita:stream: linux-lts

certfr-2026-avi-0862 — De multiples vulnérabilités ont été découvertes dans le noyau Linux de Debian LTS. Certaines d'entre elles permettent à…

certfr-2026-avi-0862

EUVD-2026-348234

fkie_cve-2026-53341

In the Linux kernel, the following vulnerability has been resolved:

fhandle: fix UAF due to unlocked ->mnt_ns read in may_decode_fh()

may_decode_fh() accesses mount::mnt_ns without holding any locks; that means the mount can concurrently be unmounted, and the mnt_namespace can concurrently be freed after an RCU grace period.

This race can happens as follows, assuming that the mount point was created by open_tree(..., OPEN_TREE_CLONE):

thread 1 thread 2 RCU __do_sys_open_by_handle_at do_handle_open handle_to_path may_decode_fh is_mounted [mount::mnt_ns access] [mount::mnt_ns access] __do_sys_close fput_close_sync __fput dissolve_on_fput umount_tree class_namespace_excl_destructor namespace_unlock free_mnt_ns mnt_ns_tree_remove call_rcu(mnt_ns_release_rcu) mnt_ns_release_rcu mnt_ns_release kfree [mnt_namespace::user_ns access] **UAF**

Fix it by taking rcu_read_lock() around the mount::mnt_ns access, like in __prepend_path(). Additionally, document the semantics of mount::mnt_ns, and use WRITE_ONCE() for writers that can race with lockless readers…

GHSA-r4cc-8gxc-2cxh

In the Linux kernel, the following vulnerability has been resolved:

fhandle: fix UAF due to unlocked ->mnt_ns read in may_decode_fh()

may_decode_fh() accesses mount::mnt_ns without holding any locks; that means the mount can concurrently be unmounted, and the mnt_namespace can concurrently be freed after an RCU grace period.

This race can happens as follows, assuming that the mount point was created by open_tree(..., OPEN_TREE_CLONE):

openSUSE-SU-2026:21910-1 — Security update for the Linux Kernel

Security update for the Linux Kernel

RHSA-2026:72624 — Red Hat Security Advisory: kernel security, bug fix, and enhancement update

kernel: ext4: fix e4b bitmap inconsistency reports kernel: KVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1 kernel: KVM: arm64: Reassign nested_mmus array behind mmu_lock kernel: fhandle: fix UAF due to unlocked ->mnt_ns read in may_decode_fh() kernel: perf/core: Detach event groups during remove_on_exec kernel: vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets kernel: perf: Reject exited events as group leaders kernel: crypto: tegra - fix rctx->cryptlen calculation in tegra_gcm_do_one_req() kernel: nvme-tcp: reject a read that transferred too few bytes kernel: KVM: arm64: Handle negative S1 walk levels in VNCR TLB size evaluation

RLSA-2026:72623 — Important: kernel security, bug fix, and enhancement update

Affected: Rocky Linux:9: kernel

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

* kernel: ext4: fix e4b bitmap inconsistency reports (CVE-2026-45942)

* kernel: RDMA/rxe: Fix iova-to-va conversion for MR page sizes != PAGE_SIZE (CVE-2026-46325)

* kernel: crypto: af_alg - Cap AEAD AD length to 0x80000000 (CVE-2026-52972)

* kernel: fhandle: fix UAF due to unlocked ->mnt_ns read in may_decode_fh() (CVE-2026-53341)

* kernel: arm64: tlb: Flush walk cache when unsharing PMD tables (CVE-2026-63875)

* kernel: RDMA/siw: Reject MPA FPDU length underflow before signed receive math (CVE-2026-64102)

* kernel: perf/core: Detach event groups during remove_on_exec (CVE-2026-64556)

* kernel: crypto: tegra - fix rctx->cryptlen calculation in tegra_gcm_do_one_req() (CVE-2026-80522)

* kernel: perf: Reject exited events as group leaders (CVE-2026-74753)

Bug Fix(es) and Enhancement(s):

* KVM: s390: Limit adapter indicator access to mapped page [rhel-9.8.z] (JIRA:Rocky Linux-188656)

* crypto: xxhash64 should not be fips approved [rhel-9.8.z] (JIRA:Rocky Linux-256437)

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.

SUSE-SU-2026:23881-1 — Security update for the Linux Kernel

Security update for the Linux Kernel

UBUNTU-CVE-2026-53341

Affected: Ubuntu:16.04:LTS: linux-hwe-edge, Ubuntu:18.04:LTS: linux-aws-5.0, Ubuntu:18.04:LTS: linux-aws-5.3, Ubuntu:18.04:LTS: linux-azure, Ubuntu:18.04:LTS: linux-azure-5.3, Ubuntu:18.04:LTS: linux-azure-edge, Ubuntu:18.04:LTS: linux-gcp, Ubuntu:18.04:LTS: linux-gcp-5.3, Ubuntu:18.04:LTS: linux-gke-4.15, Ubuntu:18.04:LTS: linux-gke-5.4 and 128 more

In the Linux kernel, the following vulnerability has been resolved: fhandle: fix UAF due to unlocked ->mnt_ns read in may_decode_fh() may_decode_fh() accesses mount::mnt_ns without holding any locks; that means the mount can concurrently be unmounted, and the mnt_namespace can concurrently be freed after an RCU grace period. This race can happens as follows, assuming that the mount point was created by open_tree(..., OPEN_TREE_CLONE): thread 1 thread 2 RCU __do_sys_open_by_handle_at do_handle_open handle_to_path may_decode_fh is_mounted [mount::mnt_ns access] [mount::mnt_ns access] __do_sys_close fput_close_sync __fput dissolve_on_fput umount_tree class_namespace_excl_destructor namespace_unlock free_mnt_ns mnt_ns_tree_remove call_rcu(mnt_ns_release_rcu) mnt_ns_release_rcu mnt_ns_release kfree [mnt_namespace::user_ns access] **UAF** Fix it by taking rcu_read_lock() around the mount::mnt_ns access, like in __prepend_path(). Additionally, document the semantics of mount::mnt_ns, and use WRITE_ONCE() for writers that can race with lockless readers. Thi…

WID-SEC-W-2026-2175 — Linux Kernel: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen im Linux Kernel ausnutzen, um einen nicht näher spezifizierten Angriff durchzuführen, darunter möglicherweise das Auslösen eines Denial-of-Service-Zustands, die Umgehung von Sicherheitsmaßnahmen oder das Verursachen von Speicherbeschädigungen.