CVE-2026-123876
Podman: containers-common: containers-common: default seccomp af_vsock/netlink_audit deny rules bypassable via 32-bit truncation
CVSS Score
4.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-184 |
| Vendor | red hat |
| Product | red hat enterprise linux 10 |
| Published | Nov 6, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
Red Hat / Red Hat Enterprise Linux 10
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Hardened Images
All versions affected Red Hat / Red Hat Hardened Images
All versions affected Red Hat / Red Hat Hardened Images
All versions affected Red Hat / Red Hat OpenShift Container Platform 4
All versions affected Red Hat / Red Hat OpenShift Container Platform 4
All versions affected Red Hat / Red Hat OpenShift Container Platform 4
All versions affected Red Hat / Red Hat OpenShift Container Platform 5
All versions affected References
access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-123876 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2566536 github.com: https://github.com/podman-container-tools/container-libs/issues/1248 github.com: https://github.com/podman-container-tools/container-libs/pull/1249 openwall.com: https://www.openwall.com/lists/oss-security/2026/10/27/3
Credits
Red Hat would like to thank Ricardo Branco (SUSE) for reporting this issue.