CVE-2026-45966

MEDIUM EPSS 2.2%
Published May 27, 20261mo ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published May 27, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

Description

In the Linux kernel, the following vulnerability has been resolved: apparmor: fix NULL pointer dereference in __unix_needs_revalidation When receiving file descriptors via SCM_RIGHTS, both the socket pointer and the socket's sk pointer can be NULL during socket setup or teardown, causing NULL pointer dereferences in __unix_needs_revalidation(). This is a regression in AppArmor 5.0.0 (kernel 6.17+) where the new __unix_needs_revalidation() function was added without proper NULL checks. The crash manifests as: BUG: kernel NULL pointer dereference, address: 0x0000000000000018 RIP: aa_file_perm+0xb7/0x3b0 (or +0xbe/0x3b0, +0xc0/0x3e0) Call Trace: apparmor_file_receive+0x42/0x80 security_file_receive+0x2e/0x50 receive_fd+0x1d/0xf0 scm_detach_fds+0xad/0x1c0 The function dereferences sock->sk->sk_family without checking if either sock or sock->sk is NULL first. Add NULL checks for both sock and sock->sk before accessing sk_family.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
2.2% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 2

VendorProductVersionRange
linuxlinux_kernel*≥6.17  –  <6.18.14
linuxlinux_kernel*≥6.19  –  <6.19.4

References 3

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

Remediation

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