RHSA-2026:34764

Vulnerability from csaf_redhat - Published: 2026-07-07 14:25 - Updated: 2026-10-13 00:45
Summary
Red Hat Security Advisory: OpenShift Container Platform 4.21.23 bug fix and security update
Severity
Important
Notes
Topic: Red Hat OpenShift Container Platform release 4.21.23 is now available with updates to packages and images that fix several bugs and add enhancements. This release includes a security update for Red Hat OpenShift Container Platform 4.21. Red Hat Product Security has rated this update as having a security impact of Important. 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: Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments. This advisory contains the container images for Red Hat OpenShift Container Platform 4.21.23. See the following advisory for the RPM packages for this release: https://access.redhat.com/errata/RHBA-2026:34759 Space precludes documenting all of the container images in this advisory. See the following Release Notes documentation, which will be updated shortly for this release, for details about these changes: https://docs.redhat.com/en/documentation/openshift_container_platform/4.21/html/release_notes/ Security Fix(es): * gnutls: gnutls: Denial of Service via DTLS packet reordering vulnerability (CVE-2026-42009) * gnutls: gnutls: Authentication Bypass via NUL Character in Username (CVE-2026-42010) * kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions (CVE-2026-46243) 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. All OpenShift Container Platform 4.21 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.21/html-single/updating_clusters/index#updating-cluster-cli.
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.
CVE-2026-42009

A flaw was found in gnutls. A remote attacker could exploit an issue in the Datagram Transport Layer Security (DTLS) packet reordering logic. The comparator function, responsible for ordering DTLS packets by sequence numbers, did not correctly handle packets with duplicate sequence numbers. This could lead to unstable packet ordering or undefined behavior, resulting in a denial of service.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-475 - Undefined Behavior for Input to API
Affected products
Product Identifier Version Remediation
Unresolved product id: 9Base-RHOSE-4.21:rhcos-aarch64-4.21.9.6.202607011303-0 —
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:rhcos-ppc64le-4.21.9.6.202607011303-0 —
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:rhcos-s390x-4.21.9.6.202607011303-0 —
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:rhcos-x86_64-4.21.9.6.202607011303-0 —
Vendor Fix fix
Workaround
Threats
Impact Important
CVE-2026-42010

A flaw was found in gnutls. Servers configured with RSA-PSK (Rivest–Shamir–Adleman – Pre-Shared Key) wrongfully matched usernames containing a NUL character with truncated usernames. A remote attacker could exploit this by sending a specially crafted username, leading to an authentication bypass. This vulnerability allows an attacker to gain unauthorized access by circumventing the authentication process.

7.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
CWE-170 - Improper Null Termination
Affected products
Fixed 4 products, the same list as for CVE-2026-42009
Threats
Impact Important
CVE-2026-46243

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)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-825 - Expired Pointer Dereference
Affected products
Fixed 4 products, the same list as for CVE-2026-42009
Threats
Impact Low
References
Acknowledgments
AISLE Research Team Joshua Rogers
To clipboard 

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        {
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          "summary": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-2",
          "url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-2"
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          "date": "2026-07-07T14:25:30+00:00",
          "details": "For OpenShift Container Platform 4.21 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.21/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests may be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags.\n\nThe sha values for the release are as follows:\n\n      (For x86_64 architecture)\n      The image digest is sha256:c58d65eeaf399b6850e5cc637a199ed44066819ccbc25877a6afd44ff861d841\n\n      (For s390x architecture)\n      The image digest is sha256:5c89334e4cf13c60df32762ea475b863c7eeb5bc2cc5dafbbf65fc5351f520c6\n\n      (For ppc64le architecture)\n      The image digest is sha256:d723c3c1ca165d75bbef247f412664c36bee48ac9ce26cbddf37553c9bb736f1\n\n      (For aarch64 architecture)\n      The image digest is sha256:588cfd15da44d83f3f6375545de8c3e08c4a10f02a6f591a4b5d2e8ffe427497\n\nAll OpenShift Container Platform 4.21 users are advised to upgrade to these updated packages and images when they are available in the appropriate\nrelease channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.21/html-single/updating_clusters/index#updating-cluster-cli.",
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          "url": "https://access.redhat.com/errata/RHSA-2026:34764"
        },
        {
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          "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
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      "scores": [
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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            "9Base-RHOSE-4.21:rhcos-x86_64-4.21.9.6.202607011303-0"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "gnutls: gnutls: Denial of Service via DTLS packet reordering vulnerability"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Joshua Rogers"
          ],
          "organization": "AISLE Research Team"
        }
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      "cwe": {
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        "name": "Improper Null Termination"
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          "text": "A flaw was found in gnutls. Servers configured with RSA-PSK (Rivest\u2013Shamir\u2013Adleman \u2013 Pre-Shared Key) wrongfully matched usernames containing a NUL character with truncated usernames. A remote attacker could exploit this by sending a specially crafted username, leading to an authentication bypass. This vulnerability allows an attacker to gain unauthorized access by circumventing the authentication process.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "gnutls: gnutls: Authentication Bypass via NUL Character in Username",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability is rated as an Important severity flaw because an unauthenticated remote attacker could circumvent authentication mechanisms on exposed TLS endpoints, compromising access control and potentially gaining unauthorized access. Exploitation requires servers to be explicitly set up with RSA Pre-Shared Key (RSA-PSK) key exchange, which is an uncommon configuration that is not enabled by default across standard Red Hat deployments. Deployments utilizing standard certificate-based authentication or public key infrastructure remain unaffected by this issue.",
          "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": {
        "fixed": [
          "9Base-RHOSE-4.21:rhcos-aarch64-4.21.9.6.202607011303-0",
          "9Base-RHOSE-4.21:rhcos-ppc64le-4.21.9.6.202607011303-0",
          "9Base-RHOSE-4.21:rhcos-s390x-4.21.9.6.202607011303-0",
          "9Base-RHOSE-4.21:rhcos-x86_64-4.21.9.6.202607011303-0"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-42010"
        },
        {
          "category": "external",
          "summary": "RHBZ#2467289",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467289"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-42010",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-42010"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42010",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42010"
        },
        {
          "category": "external",
          "summary": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-4",
          "url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-4"
        }
      ],
      "release_date": "2026-04-29T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-07-07T14:25:30+00:00",
          "details": "For OpenShift Container Platform 4.21 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.21/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests may be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags.\n\nThe sha values for the release are as follows:\n\n      (For x86_64 architecture)\n      The image digest is sha256:c58d65eeaf399b6850e5cc637a199ed44066819ccbc25877a6afd44ff861d841\n\n      (For s390x architecture)\n      The image digest is sha256:5c89334e4cf13c60df32762ea475b863c7eeb5bc2cc5dafbbf65fc5351f520c6\n\n      (For ppc64le architecture)\n      The image digest is sha256:d723c3c1ca165d75bbef247f412664c36bee48ac9ce26cbddf37553c9bb736f1\n\n      (For aarch64 architecture)\n      The image digest is sha256:588cfd15da44d83f3f6375545de8c3e08c4a10f02a6f591a4b5d2e8ffe427497\n\nAll OpenShift Container Platform 4.21 users are advised to upgrade to these updated packages and images when they are available in the appropriate\nrelease channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.21/html-single/updating_clusters/index#updating-cluster-cli.",
          "product_ids": [
            "9Base-RHOSE-4.21:rhcos-aarch64-4.21.9.6.202607011303-0",
            "9Base-RHOSE-4.21:rhcos-ppc64le-4.21.9.6.202607011303-0",
            "9Base-RHOSE-4.21:rhcos-s390x-4.21.9.6.202607011303-0",
            "9Base-RHOSE-4.21:rhcos-x86_64-4.21.9.6.202607011303-0"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:34764"
        },
        {
          "category": "workaround",
          "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
          "product_ids": [
            "9Base-RHOSE-4.21:rhcos-aarch64-4.21.9.6.202607011303-0",
            "9Base-RHOSE-4.21:rhcos-ppc64le-4.21.9.6.202607011303-0",
            "9Base-RHOSE-4.21:rhcos-s390x-4.21.9.6.202607011303-0",
            "9Base-RHOSE-4.21:rhcos-x86_64-4.21.9.6.202607011303-0"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N",
            "version": "3.1"
          },
          "products": [
            "9Base-RHOSE-4.21:rhcos-aarch64-4.21.9.6.202607011303-0",
            "9Base-RHOSE-4.21:rhcos-ppc64le-4.21.9.6.202607011303-0",
            "9Base-RHOSE-4.21:rhcos-s390x-4.21.9.6.202607011303-0",
            "9Base-RHOSE-4.21:rhcos-x86_64-4.21.9.6.202607011303-0"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "gnutls: gnutls: Authentication Bypass via NUL Character in Username"
    },
    {
      "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": {
        "fixed": [
          "9Base-RHOSE-4.21:rhcos-aarch64-4.21.9.6.202607011303-0",
          "9Base-RHOSE-4.21:rhcos-ppc64le-4.21.9.6.202607011303-0",
          "9Base-RHOSE-4.21:rhcos-s390x-4.21.9.6.202607011303-0",
          "9Base-RHOSE-4.21:rhcos-x86_64-4.21.9.6.202607011303-0"
        ]
      },
      "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": "2026-07-07T14:25:30+00:00",
          "details": "For OpenShift Container Platform 4.21 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.21/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests may be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags.\n\nThe sha values for the release are as follows:\n\n      (For x86_64 architecture)\n      The image digest is sha256:c58d65eeaf399b6850e5cc637a199ed44066819ccbc25877a6afd44ff861d841\n\n      (For s390x architecture)\n      The image digest is sha256:5c89334e4cf13c60df32762ea475b863c7eeb5bc2cc5dafbbf65fc5351f520c6\n\n      (For ppc64le architecture)\n      The image digest is sha256:d723c3c1ca165d75bbef247f412664c36bee48ac9ce26cbddf37553c9bb736f1\n\n      (For aarch64 architecture)\n      The image digest is sha256:588cfd15da44d83f3f6375545de8c3e08c4a10f02a6f591a4b5d2e8ffe427497\n\nAll OpenShift Container Platform 4.21 users are advised to upgrade to these updated packages and images when they are available in the appropriate\nrelease channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.21/html-single/updating_clusters/index#updating-cluster-cli.",
          "product_ids": [
            "9Base-RHOSE-4.21:rhcos-aarch64-4.21.9.6.202607011303-0",
            "9Base-RHOSE-4.21:rhcos-ppc64le-4.21.9.6.202607011303-0",
            "9Base-RHOSE-4.21:rhcos-s390x-4.21.9.6.202607011303-0",
            "9Base-RHOSE-4.21:rhcos-x86_64-4.21.9.6.202607011303-0"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:34764"
        },
        {
          "category": "workaround",
          "details": "See the security bulletin for a detailed mitigation procedure.",
          "product_ids": [
            "9Base-RHOSE-4.21:rhcos-aarch64-4.21.9.6.202607011303-0",
            "9Base-RHOSE-4.21:rhcos-ppc64le-4.21.9.6.202607011303-0",
            "9Base-RHOSE-4.21:rhcos-s390x-4.21.9.6.202607011303-0",
            "9Base-RHOSE-4.21:rhcos-x86_64-4.21.9.6.202607011303-0"
          ]
        }
      ],
      "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"
          },
          "products": [
            "9Base-RHOSE-4.21:rhcos-aarch64-4.21.9.6.202607011303-0",
            "9Base-RHOSE-4.21:rhcos-ppc64le-4.21.9.6.202607011303-0",
            "9Base-RHOSE-4.21:rhcos-s390x-4.21.9.6.202607011303-0",
            "9Base-RHOSE-4.21:rhcos-x86_64-4.21.9.6.202607011303-0"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions"
    }
  ]
}



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Taxonomy of the tags.





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.



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.