Race condition in Linux kernel - CVE-2026-64418

Vulnerability details

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a race condition leading to use-after-free or double-free in shrinker_info teardown in mm/shrinker.c when handling memcg shrinker_info expansion and teardown during memory cgroup online and shrinker allocation operations. A local user can trigger concurrent memory cgroup and shrinker operations to cause a denial of service.

The issue occurs when a partially initialized or already published shrinker_info array remains visible to iteration during teardown.

Affected software

How to mitigate CVE-2026-64418

External References

• https://git.kernel.org/stable/c/284c267f013e45d8c89d9fb9373105dc8e6c0947
• https://git.kernel.org/stable/c/6465ff3ce65131c774a312d450abe10f4b9f3875
• https://git.kernel.org/stable/c/65476d31d8056e859c48580f82295ce159196ffe
• https://git.kernel.org/stable/c/b9a280a9a454ed514636351d53fe2a233dc5054b

Related Security Bulletins

• Race condition in Linux kernel mm
• Red Hat Enterprise Linux 10 update for kernel
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux
• Ubuntu update for linux-gcp-7.0