SB2026111249 - Anolis OS update for util-linux

Description

This security bulletin contains information about 1 vulnerability.

1) Time-of-check Time-of-use (TOCTOU) Race Condition (CVE-ID: CVE-2026-53612)

CWE-ID: CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

CVSSv4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to escalate privileges.

The vulnerability exists due to a time-of-check time-of-use race condition in the mount(8) hook_owner.c post-mount hook when performing path-based chmod() and lchown() operations on the mount target after mount() completes. A local user can swap a path component with renameat2(RENAME_EXCHANGE) to escalate privileges.

Exploitation requires an /etc/fstab entry with both user and X-mount.mode=, X-mount.owner=, or X-mount.group= options, and the mount target path must have a writable ancestor directory.

Remediation

Install update from vendor's website.

References

• https://anas.openanolis.cn/errata/detail/ANSA-2026:1728