What is CVE-2026-31633?

CVE-2026-31633 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10, classified as a Integer Overflow flaw (CWE-190), affecting Linux kernel versions from 6.16 onward and patched in 6.18.23, 6.19.13 and 7.0. CVE-2026-31633 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-31633?

CVE-2026-31633 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-2026-31633?

Yes, CVE-2026-31633 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-2026-31633 actively exploited?

CVE-2026-31633 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Integer Overflow (CWE-190)?

The product performs a calculation that can produce an integer overflow, leading to unexpected values. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/190.html

CVE-2026-31633

Critical

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix integer overflow in rxgk_verify_response() In rxgk_verify_response(), there's a potential integer overflow due to rounding up token_len before checking it, thereby allowing the length check to be bypassed. Fix this by checking the unrounded value against len too (len is limited as the response must fit in a single UDP packet).

Package Linux Kernel

Published 2026-04-24

Last modified 2026-04-27

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

Weakness type

CWE-190

CVE-2026-31633 is a Integer Overflow vulnerability

What is Integer Overflow?

The product performs a calculation that can produce an integer overflow, leading to unexpected values. 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-2026-31633 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/1f864d9daaf622aeaa774404fd51e7d6a435b046
Patch
Kernel patch commit
https://git.kernel.org/stable/c/699e52180f4231c257821c037ed5c99d5eb0edb8
Patch
Kernel patch commit
https://git.kernel.org/stable/c/c1e242beb6b1efc3c286f617e8d940c8fbf2ed41
Patch

Details

CVE ID CVE-2026-31633

Severity Critical

CVSS score 9.8 / 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-2026-31633?

CVE-2026-31633 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10 , classified as an Integer Overflow flaw (CWE-190) . It affects Linux kernel versions from 6.16 onward and has been patched in 6.18.23, 6.19.13 and 7.0. CVE-2026-31633 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-31633?

CVE-2026-31633 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-2026-31633?

Yes — CVE-2026-31633 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-2026-31633 actively exploited?

No — CVE-2026-31633 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Integer Overflow (CWE-190)?

The product performs a calculation that can produce an integer overflow, leading to unexpected values. View CWE-190 on MITRE CWE →