RHSA-2025:20957 - Security Advisory

Topic

An update for runc is now available for Red Hat Enterprise Linux 9.

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.

Description

The runC tool is a lightweight, portable implementation of the Open Container Format (OCF) that provides container runtime.

Security Fix(es):

• runc: container escape via 'masked path' abuse due to mount race conditions (CVE-2025-31133)
• runc: container escape with malicious config due to /dev/console mount and related races (CVE-2025-52565)
• runc: container escape and denial of service due to arbitrary write gadgets and procfs write redirects (CVE-2025-52881)

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.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 9 x86_64
• Red Hat Enterprise Linux for IBM z Systems 9 s390x
• Red Hat Enterprise Linux for Power, little endian 9 ppc64le
• Red Hat Enterprise Linux for ARM 64 9 aarch64

Fixes

• BZ - 2404705 - CVE-2025-31133 runc: container escape via 'masked path' abuse due to mount race conditions
• BZ - 2404708 - CVE-2025-52565 runc: container escape with malicious config due to /dev/console mount and related races
• BZ - 2404715 - CVE-2025-52881 runc: opencontainers/selinux: container escape and denial of service due to arbitrary write gadgets and procfs write redirects

CVEs

• CVE-2025-31133
• CVE-2025-52565
• CVE-2025-52881

References

• https://access.redhat.com/security/updates/classification/#important