SB20260727153 - Race condition in Linux kernel mm

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-64418)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

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.

Remediation

Install update from vendor's website.

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