---
id: CVE-2026-31676
title: |-
  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
summary: |-
  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 …
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 2.6.22, < 6.6.136'
  - 'linux_kernel >= 6.7, < 6.12.84'
  - 'linux_kernel >= 6.13, < 6.18.23'
  - 'linux_kernel >= 6.19, < 6.19.13'
  - linux_kernel = 7.0
patched:
  - linux_kernel 6.19.13
published: '2026-04-25'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T02:19:16.680'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-31676'
references:
  - url: 'https://git.kernel.org/stable/c/03fd2ef73cb4ffd0af100a95b634af54f474414e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/0afdfd4941c1b60a1f5c361760daa970edca60cd'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/29b44d904dceb832be880def08b8cb17a0aba91c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6c3a0fbdafef8316e34ae22333e317a341e737cd'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a1a8efde03a40b6c658d580e96644d9b9a2a0d3a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a6bcf8010af093fe04f7100562e9542ab7882585'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c43ffdcfdbb5567b1f143556df8a04b4eeea041c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d0035e634dae83237ab7f5681eb52b2f65d0ceb8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-784472.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00716
epssPercentile: 0.52719
ingestedAt: '2026-10-15T03:30:12.864Z'
---

## Overview

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.

## Affected

- `linux_kernel >= 2.6.22, < 6.6.136`
- `linux_kernel >= 6.7, < 6.12.84`
- `linux_kernel >= 6.13, < 6.18.23`
- `linux_kernel >= 6.19, < 6.19.13`
- `linux_kernel = 7.0`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.19.13`