What is CVE-2026-31631?

CVE-2026-31631 is a High severity Linux kernel vulnerability with a CVSS score of 8.2 out of 10, classified as a Out-of-bounds Write flaw (CWE-787), affecting Linux kernel versions from 6.16 onward and patched in 6.18.23, 6.19.13 and 7.0. CVE-2026-31631 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-31631?

CVE-2026-31631 has a CVSS score of 8.2 out of 10, rated High severity. The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H.

Is there a patch available for CVE-2026-31631?

Yes, CVE-2026-31631 has been patched. Fixed versions include 6.18.23, 6.19.13 and 7.0. If you are running Linux kernel 6.16 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-31631 actively exploited?

CVE-2026-31631 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Out-of-bounds Write (CWE-787)?

The product writes data past the end or before the beginning of the intended buffer. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/787.html

CVE-2026-31631

High

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix buffer overread in rxgk_do_verify_authenticator() Fix rxgk_do_verify_authenticator() to check the buffer size before checking the nonce.

Package Linux Kernel

Published 2026-04-24

Last modified 2026-04-27

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

8.2

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:L/I:N/A:H

Weakness type

CWE-787

CVE-2026-31631 is a Out-of-bounds Write vulnerability

What is Out-of-bounds Write?

The product writes data past the end or before the beginning of the intended buffer. Learn more on MITRE CWE

Affected versions

Linux kernel versions 6.16 and later are affected. Fixed in 6.18.23, 6.19.13, 7.0 and their respective stable series.

Affected from

≥ 6.16

Fixed in

✓ 6.18.23 6.18.x ✓ 6.19.13 6.19.x ✓ 7.0

References

The following references provide additional information about CVE-2026-31631 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/1c4422d8be81718ecb15d79aedff607323085201
Patch
Kernel patch commit
https://git.kernel.org/stable/c/794586789800b16dcbe235452494f4223ac80413
Patch
Kernel patch commit
https://git.kernel.org/stable/c/f564af387c8c28238f8ebc13314c589d7ba8475d
Patch

Details

CVE ID CVE-2026-31631

Severity High

CVSS score 8.2 / 10

CVSS version 3.1

Published 2026-04-24

Modified 2026-04-27

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-31631?

CVE-2026-31631 is a High severity Linux kernel vulnerability with a CVSS score of 8.2 out of 10 , classified as an Out-of-bounds Write flaw (CWE-787) . It affects Linux kernel versions from 6.16 onward and has been patched in 6.18.23, 6.19.13 and 7.0. CVE-2026-31631 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-31631?

CVE-2026-31631 has a CVSS score of 8.2 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:L/I:N/A:H.
Is there a patch available for CVE-2026-31631?

Yes — CVE-2026-31631 has been patched. Fixed versions include 6.18.23, 6.19.13 and 7.0. If you are running Linux kernel 6.16 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-31631 actively exploited?

No — CVE-2026-31631 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Out-of-bounds Write (CWE-787)?

The product writes data past the end or before the beginning of the intended buffer. View CWE-787 on MITRE CWE →