---
id: CVE-2026-31631
title: 'rxrpc: Fix buffer overread in rxgk_do_verify_authenticator()'
summary: |-
  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.
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a <
    794586789800b16dcbe235452494f4223ac80413
  - >-
    Linux >= 9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a <
    1c4422d8be81718ecb15d79aedff607323085201
  - >-
    Linux >= 9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a <
    f564af387c8c28238f8ebc13314c589d7ba8475d
  - Linux 6.16
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-16T15:11:20.356548Z'
published: '2026-04-24'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:20:17.371Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-31631'
references:
  - url: 'https://git.kernel.org/stable/c/794586789800b16dcbe235452494f4223ac80413'
  - url: 'https://git.kernel.org/stable/c/1c4422d8be81718ecb15d79aedff607323085201'
  - url: 'https://git.kernel.org/stable/c/f564af387c8c28238f8ebc13314c589d7ba8475d'
tags:
  - cve.org
epss: 0.00551
epssPercentile: 0.44867
ingestedAt: '2026-10-16T17:24:46.664Z'
---

## Overview

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.

## Affected

- `Linux >= 9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a < 794586789800b16dcbe235452494f4223ac80413`
- `Linux >= 9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a < 1c4422d8be81718ecb15d79aedff607323085201`
- `Linux >= 9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a < f564af387c8c28238f8ebc13314c589d7ba8475d`
- `Linux 6.16`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.