RHSA-2026:34757

Vulnerability from csaf_redhat - Published: 2026-07-09 13:52 - Updated: 2026-07-09 23:01
Summary
Red Hat Security Advisory: OpenShift Container Platform 4.19.37 bug fix and security update
Severity
Moderate
Notes
Topic: Red Hat OpenShift Container Platform release 4.19.37 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 4.19. 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 4.19.37. See the following advisory for the RPM packages for this release: https://access.redhat.com/errata/RHSA-2026:34755 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/4.19/html/release_notes/ Security Fix(es): * kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions (CVE-2026-46243) * crun: crun: Privilege escalation due to incorrect parsing of the `--user` option (CVE-2026-30892) 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 4.19 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/4.19/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-2026-30892

A flaw was found in crun, an open-source OCI Container Runtime. A local user can exploit this vulnerability due to incorrect parsing of the `--user` option when using `crun exec`. The value `1` is misinterpreted as root privileges (User ID 0 and Group ID 0) instead of the intended User ID 1 and Group ID 0. This allows a process to run with higher privileges than expected, leading to privilege escalation.

7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-115 - Misinterpretation of Input
Affected products
Product Identifier Version Remediation
Unresolved product id: 9Base-RHOSE-4.19:rhcos-aarch64-4.19.9.6.202606302000-0 —
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202606302000-0 —
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202606302000-0 —
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202606302000-0 —
Vendor Fix fix
Workaround
Threats
Impact Moderate
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
Product Identifier Version Remediation
Unresolved product id: 9Base-RHOSE-4.19:rhcos-aarch64-4.19.9.6.202606302000-0 —
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202606302000-0 —
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202606302000-0 —
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202606302000-0 —
Vendor Fix fix
Workaround
Threats
Impact Low
References
To clipboard 

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      "discovery_date": "2026-03-26T01:01:25.312958+00:00",
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          "text": "2451576"
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          "category": "description",
          "text": "A flaw was found in crun, an open-source OCI Container Runtime. A local user can exploit this vulnerability due to incorrect parsing of the `--user` option when using `crun exec`. The value `1` is misinterpreted as root privileges (User ID 0 and Group ID 0) instead of the intended User ID 1 and Group ID 0. This allows a process to run with higher privileges than expected, leading to privilege escalation.",
          "title": "Vulnerability description"
        },
        {
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          "text": "crun: crun: Privilege escalation due to incorrect parsing of the `--user` option",
          "title": "Vulnerability summary"
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          "text": "Red Hat has rated this vulnerability as Moderate because the flaw exists in the OCI container runtime crun. When crun exec -u 1 is used, crun incorrectly interprets UID 1 as UID 0 (root), causing the executed process to run with root privileges inside the container instead of as the intended unprivileged user.\n\nSuccessful exploitation requires local access to container management operations. An attacker must already have the ability to invoke crun exec against an existing container. The vulnerability is not remotely exploitable and cannot be triggered by an unauthenticated attacker.\n\nAdditionally, the privilege escalation is limited to the container context. While the flaw allows an attacker to obtain root privileges within the affected container, there is no demonstrated container escape or direct compromise of the host system resulting from this issue alone.",
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          "summary": "RHBZ#2451576",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451576"
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          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-30892",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-30892"
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          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-30892",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-30892"
        },
        {
          "category": "external",
          "summary": "https://github.com/containers/crun/commit/1bd7f42446999b0e76bc3d575392e05c943b0b01",
          "url": "https://github.com/containers/crun/commit/1bd7f42446999b0e76bc3d575392e05c943b0b01"
        },
        {
          "category": "external",
          "summary": "https://github.com/containers/crun/releases/tag/1.27",
          "url": "https://github.com/containers/crun/releases/tag/1.27"
        },
        {
          "category": "external",
          "summary": "https://github.com/containers/crun/security/advisories/GHSA-4vg2-xjqj-7chj",
          "url": "https://github.com/containers/crun/security/advisories/GHSA-4vg2-xjqj-7chj"
        }
      ],
      "release_date": "2026-03-25T23:57:01.741000+00:00",
      "remediations": [
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          "date": "2026-07-09T13:52:43+00:00",
          "details": "For OpenShift Container Platform 4.19 see the following documentation,\nwhich will be updated shortly for this release, for important instructions\non how to upgrade your cluster and fully apply this asynchronous errata\nupdate:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata\nfor x86_64, s390x, ppc64le, and aarch64 architectures. The image digests\nmay be found at\nhttps://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 sha256:79dbf4584baf7b1dc523add340b02a22edd635c6c275a4f9124574a334b7310f\n\n      (For s390x architecture)\n      The image digest is sha256:187d99cc0aa359369ed2ab906f1bd80074a23789813adb0b077a13ae3d6e4ef3\n\n      (For ppc64le architecture)\n      The image digest is sha256:0ff726e23ec140f6af03a2aaaeaa7ec10c98b115cc0cd7355f7442551bc038f2\n\n      (For aarch64 architecture)\n      The image digest is sha256:a7b6e859ba988dc3e3c1679bd4710a1f2b0c3c62ccafdd6a66867fe264ad5bd5\n\nAll OpenShift Container Platform 4.19 users are advised to upgrade to these\nupdated packages and images when they are available in the appropriate\nrelease channel. To check for available updates, use the OpenShift CLI (oc)\nor web console. Instructions for upgrading a cluster are available at\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html-single/updating_clusters/index#updating-cluster-cli.",
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        },
        {
          "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.",
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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"
          },
          "products": [
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            "9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202606302000-0",
            "9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202606302000-0",
            "9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202606302000-0"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "crun: crun: Privilege escalation due to incorrect parsing of the `--user` option"
    },
    {
      "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.",
          "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-4.19:rhcos-aarch64-4.19.9.6.202606302000-0",
          "9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202606302000-0",
          "9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202606302000-0",
          "9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202606302000-0"
        ]
      },
      "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": "2026-07-09T13:52:43+00:00",
          "details": "For OpenShift Container Platform 4.19 see the following documentation,\nwhich will be updated shortly for this release, for important instructions\non how to upgrade your cluster and fully apply this asynchronous errata\nupdate:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata\nfor x86_64, s390x, ppc64le, and aarch64 architectures. The image digests\nmay be found at\nhttps://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 sha256:79dbf4584baf7b1dc523add340b02a22edd635c6c275a4f9124574a334b7310f\n\n      (For s390x architecture)\n      The image digest is sha256:187d99cc0aa359369ed2ab906f1bd80074a23789813adb0b077a13ae3d6e4ef3\n\n      (For ppc64le architecture)\n      The image digest is sha256:0ff726e23ec140f6af03a2aaaeaa7ec10c98b115cc0cd7355f7442551bc038f2\n\n      (For aarch64 architecture)\n      The image digest is sha256:a7b6e859ba988dc3e3c1679bd4710a1f2b0c3c62ccafdd6a66867fe264ad5bd5\n\nAll OpenShift Container Platform 4.19 users are advised to upgrade to these\nupdated packages and images when they are available in the appropriate\nrelease channel. To check for available updates, use the OpenShift CLI (oc)\nor web console. Instructions for upgrading a cluster are available at\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html-single/updating_clusters/index#updating-cluster-cli.",
          "product_ids": [
            "9Base-RHOSE-4.19:rhcos-aarch64-4.19.9.6.202606302000-0",
            "9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202606302000-0",
            "9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202606302000-0",
            "9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202606302000-0"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:34757"
        },
        {
          "category": "workaround",
          "details": "See the security bulletin for a detailed mitigation procedure.",
          "product_ids": [
            "9Base-RHOSE-4.19:rhcos-aarch64-4.19.9.6.202606302000-0",
            "9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202606302000-0",
            "9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202606302000-0",
            "9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202606302000-0"
          ]
        }
      ],
      "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-4.19:rhcos-aarch64-4.19.9.6.202606302000-0",
            "9Base-RHOSE-4.19:rhcos-ppc64le-4.19.9.6.202606302000-0",
            "9Base-RHOSE-4.19:rhcos-s390x-4.19.9.6.202606302000-0",
            "9Base-RHOSE-4.19:rhcos-x86_64-4.19.9.6.202606302000-0"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions"
    }
  ]
}



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Tags
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.


Detection rules are retrieved from Rulezet.