SB20260928345 - Use-after-free in Linux kernel landlock

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-97594)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to compromise confidentiality, integrity, and availability.

The vulnerability exists due to use-after-free in current_check_refer_path() in the Landlock filesystem access-control implementation when racing linkat(2) calls against concurrent rename(2) and rmdir(2) operations. A local user can race a linkat(2) loop against rename(2) and rmdir(2) to compromise confidentiality, integrity, and availability.

Exploitation requires entering a Landlock domain that handles at least one filesystem access right.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2c6dc792538260a8087ac5b22c31b3b8e47c85d6
• https://git.kernel.org/stable/c/379efd2ce8b26fd35feb13ccc2f671ff105a5052
• https://git.kernel.org/stable/c/ba29c46ccfe3ebadfb8aa18149186c49f84b14f8