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CVE-2026-123876VulnerabilityPublished Updated

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Affects Red HatSource GCVE Database

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Authoritative record:CVE-2026-123876· Medium 4.4

Not known to be exploited · CVSS 4.4 Medium.

Data as of 13 Nov 2026, 14:33 UTC

CVSS 3.1 base score
4.4Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (redhat)CVSS 3.14.4
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Red Hat Hardened Imagescontainers-common-mainAffected–Fixed in–
Red Hat Enterprise Linux 10containers-commonAffected–Fixed in–
Red Hat Enterprise Linux 8container-tools:rhel8/containers-commonAffected–Fixed in–
Red Hat Enterprise Linux 9containers-commonAffected–Fixed in–
Red Hat Hardened ImagespodmanAffected–Fixed in–
Red Hat Hardened ImagesskopeoAffected–Fixed in–

AI-suggested

A fix is available in the updated containers-common packages (version 0.70.0-1.hum1). Users should apply this update to receive the corrected seccomp profiles with masked equality comparisons. Until the update is applied, enforcing SELinux may provide some denial of vsock usage, but relying solely on the unfixed seccomp denies is not recommended.

Description

A flaw exists in the default seccomp profile used by Podman via containers-common, where deny rules for AF_VSOCK and NETLINK_AUDIT socket arguments compare unmasked 64-bit values. The Linux kernel truncates these arguments to 32 bits, allowing bypass of the deny rules by setting upper bits. Enforcing SELinux may still block vsock, but relying solely on the unfixed seccomp denies is insufficient. Updated seccomp profiles with masked comparisons are recommended.

References

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