RHSA-2026:0425 - Security Advisory

Topic

An update for runc is now available for Red Hat Enterprise Linux 9.4 Extended Update Support.

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)
• github.com/sirupsen/logrus: github.com/sirupsen/logrus: Denial-of-Service due to large single-line payload (CVE-2025-65637)

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 - Extended Update Support 9.4 x86_64
• Red Hat Enterprise Linux Server - AUS 9.4 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 9.4 s390x
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 9.4 ppc64le
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 9.4 aarch64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.4 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.4 x86_64
• Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.4 aarch64
• Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.4 s390x

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
• BZ - 2418900 - CVE-2025-65637 github.com/sirupsen/logrus: github.com/sirupsen/logrus: Denial-of-Service due to large single-line payload

CVEs

• CVE-2025-31133
• CVE-2025-52565
• CVE-2025-52881
• CVE-2025-65637

References

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