SB20260528110 - NULL pointer dereference in Linux kernel apparmor

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2026-45966)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 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/E:U/U:Clear

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a NULL pointer dereference in __unix_needs_revalidation() when receiving file descriptors via SCM_RIGHTS during socket setup or teardown. A local user can send file descriptors in this state to cause a denial of service.

The issue is triggered because the function accesses sock->sk->sk_family without checking whether sock or sock->sk is NULL.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/e2938ad00b21340c0362562dfedd7cfec0554d67
• https://git.kernel.org/stable/c/e85bc9101afc4202aa2269967ce9d3ffbecd0994
• https://git.kernel.org/stable/c/fea017a7f6abe179decf575a2d8464c74edb3964