What is CVE-2026-31418?

CVE-2026-31418 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 5.4.24 onward and patched in 5.10.253, 5.15.203, 6.1.168 and others. CVE-2026-31418 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-31418?

CVE-2026-31418 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2026-31418?

Yes, CVE-2026-31418 has been patched. Fixed versions include 5.10.253, 5.15.203, 6.1.168 and others. If you are running Linux kernel 5.4.24 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-31418 actively exploited?

CVE-2026-31418 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-31418

Medium

In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: drop logically empty buckets in mtype_del mtype_del() counts empty slots below n->pos in k, but it only drops the bucket when both n->pos and k are zero. This misses buckets whose live entries have all been removed while n->pos still points past deleted slots. Treat a bucket as empty when all positions below n->pos are unused and release it directly instead of shrinking it further.

Package Linux Kernel

Published 2026-04-13

Last modified 2026-05-20

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

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

Affected versions

Linux kernel versions 5.4.24, 5.5.8, 5.6 and later are affected. Fixed in 5.10.253, 5.15.203, 6.1.168, 6.6.134, 6.12.81, 6.18.22, 6.19.12, 7.0 and their respective stable series.

Affected from

≥ 5.4.24 ≥ 5.5.8 ≥ 5.6

Fixed in

✓ 5.10.253 5.10.x ✓ 5.15.203 5.15.x ✓ 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-2026-31418 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/58f3a14826d4e6b0d5421f1a64be280b48601ea2
Patch
Kernel patch commit
https://git.kernel.org/stable/c/68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4
Patch
Kernel patch commit
https://git.kernel.org/stable/c/6cea34d7ec6829b62f521a37a287f670144a2233
Patch

8 patch commits total View all on NVD

Details

CVE ID CVE-2026-31418

Severity Medium

CVSS score 5.5 / 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-2026-31418?

CVE-2026-31418 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 5.4.24 onward and has been patched in 5.10.253, 5.15.203, 6.1.168 and others. CVE-2026-31418 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-31418?

CVE-2026-31418 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2026-31418?

Yes — CVE-2026-31418 has been patched. Fixed versions include 5.10.253, 5.15.203, 6.1.168 and others. If you are running Linux kernel 5.4.24 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-31418 actively exploited?

No — CVE-2026-31418 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.