What’s Vulnerable › Vulnerabilities

CVE-2026-45848: apparmor: fix NULL sock in aa_sock_file_perm

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-27 · updated 2026-06-25
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: apparmor: fix NULL sock in aa_sock_file_perm Deal with the potential that sock and sock-sk can be NULL during socket setup or teardown. This could lead to an oops. The fix for NULL pointer dereference in __unix_needs_revalidation shows this is at least possible for af_unix sockets. While the fix for af_unix sockets applies for newer mediation this is still the fall back path for older af_unix mediation and other sockets, so ensure it is covered.

Affected products

• Linux kernel: from 4.17 before 5.10.252; from 5.11 before 5.15.202; from 5.16 before 6.1.165; from 6.2 before 6.6.128; from 6.7 before 6.12.75; from 6.13 before 6.18.14 — fixed in 5.10.252, 5.15.202, 6.1.165, 6.12.75, 6.18.14, 6.19.4

How to fix

Upgrade to a fixed version: Linux kernel 5.10.252, 5.15.202, 6.1.165, 6.12.75. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/00b67657535dfea56e84d11492f5c0f61d0af297
• https://git.kernel.org/stable/c/0dc19bca22606f7a61d5988408f74e3ae0ef3486
• https://git.kernel.org/stable/c/3852eb9a0392eb435c03dcb47d581bcfe6a9a95b
• https://git.kernel.org/stable/c/5121b7283f1c46e4c06b88b1dda7b064429d77de
• https://git.kernel.org/stable/c/68538ec34fcb4194c7961dc4eca6f5537fec8067
• https://git.kernel.org/stable/c/8a0ededbfcff74598f82f1d4b8ef9db28878b317
• https://git.kernel.org/stable/c/c11b7c3280d000376e27ebfed17ec7046699eab4
• https://git.kernel.org/stable/c/ccb66a3c6c8f51b3ed1bc003b70bb9ff99e8d835

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