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  4. CVE 2026 123876 podman containers common containers common
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Back to active CVEs
Medium · CVSS 4.4CVE-2026-123876

Podman: containers-common: containers-common: default seccomp af_vsock/netlink_audit deny rules bypassable via 32-bit truncationCVE-2026-123876

Answer in brief

CVE-2026-123876 records a Medium severity (CVSS 4.4) vulnerability in Podman: containers-common: containers-common: default seccomp af_vsock/netlink_audit deny rules bypassable via 32-bit truncation. The current sources do not mark it as known exploited. The current feed maps Red Hat/containers-common (generic), Red Hat/container-tools:rhel8/containers-common (generic), Red Hat/openshift/ose-rhel-coreos-8 (generic), Red Hat/openshift/ose-rhel-coreos-9 (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 6, 2026Updated Nov 6, 2026Source checked Nov 6, 2026First seen by HOL Nov 6, 2026Material review Nov 6, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 4.4
Exploitation
Not marked as known exploited
Affected software
5 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 4.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/containers-common (generic), Red Hat/container-tools:rhel8/containers-common (generic), Red Hat/openshift/ose-rhel-coreos-8 (generic), Red Hat/openshift/ose-rhel-coreos-9 (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/containers-commongeneric*Not reported
Red Hat/container-tools:rhel8/containers-commongeneric*Not reported
Red Hat/openshift/ose-rhel-coreos-8generic*Not reported
Red Hat/openshift/ose-rhel-coreos-9generic*Not reported
Red Hat/podmangeneric*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/containers-common, Red Hat/container-tools:rhel8/containers-common, Red Hat/openshift/ose-rhel-coreos-8.
  2. 2Review the reported fix. Source-reported workaround: Enforcing SELinux may still deny vsock; do not rely on the unfixed seccomp denies; ship SCMP_CMP_MASKED_EQ profile updates.

Evidence timeline and material changes

  1. Published upstream

    Nov 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 6, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referenceopenwall.com
Upstream source description

A flaw was found in the default seccomp profile used by Podman via containers-common. Deny rules for AF_VSOCK and NETLINK_AUDIT compared socket arguments with unmasked 64-bit equality. Because the kernel truncates those int arguments to 32 bits, setting upper bits can bypass the deny rules.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-184
Source
CVE List V5
Source checked
Nov 6, 2026
References
5 linked sources
Open source record