SB2026052818 - Improper control of a resource through its lifetime in Linux kernel selftests landlock

Description

This security bulletin contains information about 1 vulnerability.

1) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-46057)

CWE-ID: CWE-664 - Improper control of a resource through its lifetime

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to cause unexpected audit records.

The vulnerability exists due to improper state management in the Landlock credential blob handling across fork() when transferring credentials for a child process after muting subdomain logs without creating a domain. A local user can fork a process with crafted Landlock credential state to cause unexpected audit records.

The issue occurs when LOG_SUBDOMAINS_OFF is set through the ruleset_fd=-1 path, which commits the field without creating a Landlock domain.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/1c513b8a00df13d231021e74ad92babb3fedf64a
• https://git.kernel.org/stable/c/2fcde49092aac55d5beef43fdd3633217672f7d1
• https://git.kernel.org/stable/c/874c8f83826c95c62c21d9edfe9ef43e5c346724