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Vulnerability record · CVE-2026-31633 · published 24 April 2026

CVE-2026-31633: Linux kernel integer overflow vulnerability

Linux · Linux Kernel

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).

9.8 CVSS 3.1 Critical EPSS 0.69% · top 49.2% CWE-190 · Integer overflow
9.8CVSS 3.1 base score
0.69%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

Description

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).

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/1f864d9daaf622aeaa774404fd51e7d6a435b046 Patch
https://git.kernel.org/stable/c/699e52180f4231c257821c037ed5c99d5eb0edb8 Patch
https://git.kernel.org/stable/c/c1e242beb6b1efc3c286f617e8d940c8fbf2ed41 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-31633), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.