What is CVE-2025-40169?

CVE-2025-40169 is a unscored severity Linux kernel vulnerability, affecting Linux kernel versions from 6.6 onward and patched in 6.6.112, 6.12.53, 6.17.3 and others. CVE-2025-40169 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-40169?

CVE-2025-40169 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2025-40169?

Yes, CVE-2025-40169 has been patched. Fixed versions include 6.6.112, 6.12.53, 6.17.3 and others. If you are running Linux kernel 6.6 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-40169 actively exploited?

CVE-2025-40169 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-40169

In the Linux kernel, the following vulnerability has been resolved: bpf: Reject negative offsets for ALU ops When verifying BPF programs, the check_alu_op() function validates instructions with ALU operations. The 'offset' field in these instructions is a signed 16-bit integer. The existing check 'insn->off > 1' was intended to ensure the offset is either 0, or 1 for BPF_MOD/BPF_DIV. However, because 'insn->off' is signed, this check incorrectly accepts all negative values (e.g., -1). This commit tightens the validation by changing the condition to '(insn->off != 0 && insn->off != 1)'. This ensures that any value other than the explicitly permitted 0 and 1 is rejected, hardening the verifier against malformed BPF programs.

Package Linux Kernel

Published 2025-11-12

Last modified 2026-04-15

Patch available

Yes

Affected versions

Linux kernel versions 6.6 and later are affected. Fixed in 6.6.112, 6.12.53, 6.17.3, 6.18 and their respective stable series.

Affected from

≥ 6.6

Fixed in

✓ 6.6.112 6.6.x ✓ 6.12.53 6.12.x ✓ 6.17.3 6.17.x ✓ 6.18

References

The following references provide additional information about CVE-2025-40169 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/21167bf70dbe400563e189ac632258d35eda38b5
Patch
Kernel patch commit
https://git.kernel.org/stable/c/3bce44b344040e5eef3d64d38b157c15304c0aab
Patch
Kernel patch commit
https://git.kernel.org/stable/c/5017c302ca4b2a45149ad64e058fa2d5623c068f
Patch

4 patch commits total View all on NVD

Frequently asked questions

What is CVE-2025-40169?

CVE-2025-40169 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.6 onward and has been patched in 6.6.112, 6.12.53, 6.17.3 and others. CVE-2025-40169 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2025-40169?

Yes — CVE-2025-40169 has been patched. Fixed versions include 6.6.112, 6.12.53, 6.17.3 and others. If you are running Linux kernel 6.6 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-40169 actively exploited?

No — CVE-2025-40169 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.