What is CVE-2025-40169?

CVE-2025-40169 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, 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 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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

High

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 2026-07-30

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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

4 total

Details

CVE ID CVE-2025-40169

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2025-11-12

Modified 2026-07-30

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-40169?

CVE-2025-40169 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . 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.
What is the CVSS score for CVE-2025-40169?

CVE-2025-40169 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
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.