What is CVE-2026-31676?

CVE-2026-31676 is a High severity Linux kernel vulnerability with a CVSS score of 7.5 out of 10, affecting Linux kernel versions from 2.6.22 onward and patched in 5.10.258, 5.15.209, 6.1.175 and others. CVE-2026-31676 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-31676?

CVE-2026-31676 has a CVSS score of 7.5 out of 10, rated High severity. The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2026-31676?

Yes, CVE-2026-31676 has been patched. Fixed versions include 5.10.258, 5.15.209, 6.1.175 and others. If you are running Linux kernel 2.6.22 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-31676 actively exploited?

CVE-2026-31676 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-31676

High

In the Linux kernel, the following vulnerability has been resolved: rxrpc: only handle RESPONSE during service challenge Only process RESPONSE packets while the service connection is still in RXRPC_CONN_SERVICE_CHALLENGING. Check that state under state_lock before running response verification and security initialization, then use a local secured flag to decide whether to queue the secured-connection work after the state transition. This keeps duplicate or late RESPONSE packets from re-running the setup path and removes the unlocked post-transition state test.

Package Linux Kernel

Published 2026-04-25

Last modified 2026-06-01

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.5

out of 10

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

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

Affected versions

Linux kernel versions 2.6.22 and later are affected. Fixed in 5.10.258, 5.15.209, 6.1.175, 6.6.136, 6.12.84, 6.18.23, 6.19.13, 7.0 and their respective stable series.

Affected from

≥ 2.6.22

Fixed in

✓ 5.10.258 5.10.x ✓ 5.15.209 5.15.x ✓ 6.1.175 6.1.x ✓ 6.6.136 6.6.x ✓ 6.12.84 6.12.x ✓ 6.18.23 6.18.x ✓ 6.19.13 6.19.x ✓ 7.0

References

The following references provide additional information about CVE-2026-31676 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/03fd2ef73cb4ffd0af100a95b634af54f474414e
Patch
Kernel patch commit
https://git.kernel.org/stable/c/0afdfd4941c1b60a1f5c361760daa970edca60cd
Patch
Kernel patch commit
https://git.kernel.org/stable/c/29b44d904dceb832be880def08b8cb17a0aba91c
Patch

8 patch commits total View all on NVD

Details

CVE ID CVE-2026-31676

Severity High

CVSS score 7.5 / 10

CVSS version 3.1

Published 2026-04-25

Modified 2026-06-01

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-31676?

CVE-2026-31676 is a High severity Linux kernel vulnerability with a CVSS score of 7.5 out of 10 . It affects Linux kernel versions from 2.6.22 onward and has been patched in 5.10.258, 5.15.209, 6.1.175 and others. CVE-2026-31676 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-31676?

CVE-2026-31676 has a CVSS score of 7.5 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2026-31676?

Yes — CVE-2026-31676 has been patched. Fixed versions include 5.10.258, 5.15.209, 6.1.175 and others. If you are running Linux kernel 2.6.22 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-31676 actively exploited?

No — CVE-2026-31676 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.