What is CVE-2026-31414?

CVE-2026-31414 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10, affecting Linux kernel versions from 2.6.30 onward and patched in 6.1.168, 6.6.134, 6.12.81 and others. CVE-2026-31414 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-31414?

CVE-2026-31414 has a CVSS score of 9.8 out of 10, rated Critical severity. The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2026-31414?

Yes, CVE-2026-31414 has been patched. Fixed versions include 6.1.168, 6.6.134, 6.12.81 and others. If you are running Linux kernel 2.6.30 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-31414 actively exploited?

CVE-2026-31414 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-31414

Critical

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_expect: use expect->helper Use expect->helper in ctnetlink and /proc to dump the helper name. Using nfct_help() without holding a reference to the master conntrack is unsafe. Use exp->master->helper in ctnetlink path if userspace does not provide an explicit helper when creating an expectation to retain the existing behaviour. The ctnetlink expectation path holds the reference on the master conntrack and nf_conntrack_expect lock and the nfnetlink glue path refers to the master ct that is attached to the skb.

Package Linux Kernel

Published 2026-04-13

Last modified 2026-05-20

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

9.8

out of 10

Critical

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Affected versions

Linux kernel versions 2.6.30 and later are affected. Fixed in 6.1.168, 6.6.134, 6.12.81, 6.18.22, 6.19.12, 7.0 and their respective stable series.

Affected from

≥ 2.6.30

Fixed in

✓ 6.1.168 6.1.x ✓ 6.6.134 6.6.x ✓ 6.12.81 6.12.x ✓ 6.18.22 6.18.x ✓ 6.19.12 6.19.x ✓ 7.0

References

The following references provide additional information about CVE-2026-31414 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/3dfd3f7712b5a800f2ba632179e9b738076a51f0
Patch
Kernel patch commit
https://git.kernel.org/stable/c/4bd1b3d839172724b33d8d02c5a4ff6a1c775417
Patch
Kernel patch commit
https://git.kernel.org/stable/c/847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781
Patch

6 patch commits total View all on NVD

Details

CVE ID CVE-2026-31414

Severity Critical

CVSS score 9.8 / 10

CVSS version 3.1

Published 2026-04-13

Modified 2026-05-20

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-31414?

CVE-2026-31414 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10 . It affects Linux kernel versions from 2.6.30 onward and has been patched in 6.1.168, 6.6.134, 6.12.81 and others. CVE-2026-31414 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-31414?

CVE-2026-31414 has a CVSS score of 9.8 out of 10, rated Critical severity (CVSS 3.1). The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2026-31414?

Yes — CVE-2026-31414 has been patched. Fixed versions include 6.1.168, 6.6.134, 6.12.81 and others. If you are running Linux kernel 2.6.30 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-31414 actively exploited?

No — CVE-2026-31414 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.