SB20260815266 - Use of Uninitialized Variable in Linux kernel apparmor

Description

This security bulletin contains information about 1 vulnerability.

1) Use of Uninitialized Variable (CVE-ID: CVE-2026-72455)

CWE-ID: CWE-457 - Use of Uninitialized Variable

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 use of an uninitialized pointer in the AppArmor path handling logic when auditing file paths after a dentry has been replaced with aa_null.dentry. A local user can trigger file open operations that reach the affected audit path to cause a denial of service.

The issue can result in a kernel page fault during processing in audit_log_untrustedstring().

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2791dd42d41e38805572b12116f721c97c4fcc0c
• https://git.kernel.org/stable/c/a5c79d44ef19203bd7cf6f3de8ff088112ebff95
• https://git.kernel.org/stable/c/bcd1b34c21748531a3febaf7440632b89d8deab7