---
id: CVE-2026-31579
title: >-
  wireguard: device: use exit_rtnl callback instead of manual rtnl_lock in
  pre_exit
summary: >-
  In the Linux kernel, the following vulnerability has been resolved:


  wireguard: device: use exit_rtnl callback instead of manual rtnl_lock in
  pre_exit


  wg_netns_pre_exit() manually acquires rtnl_lock() inside the

  pernet .pre_exit callbac…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 900575aa33a3eaaef802b31de187a85c4a4b4bd0 <
    707607db2193591b68c0e70f814133472c185b1e
  - >-
    Linux >= 900575aa33a3eaaef802b31de187a85c4a4b4bd0 <
    9a9e69155b2091b8297afaf1533b8d68a3096841
  - >-
    Linux >= 900575aa33a3eaaef802b31de187a85c4a4b4bd0 <
    1c52ef00e391144334f10995985c2f256d4be982
  - >-
    Linux >= 900575aa33a3eaaef802b31de187a85c4a4b4bd0 <
    a1d0f6cbb962af29586e3e65a4bced1a5e39221f
  - >-
    Linux >= 900575aa33a3eaaef802b31de187a85c4a4b4bd0 <
    60a25ef8dacb3566b1a8c4de00572a498e2a3bf9
  - Linux 363cc6efdbb54bb06cd5034a69b41aae974a736f
  - Linux >= 5.7.7 < 5.8
  - Linux 5.8
published: '2026-04-24'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T12:39:33.170Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-31579'
references:
  - url: 'https://git.kernel.org/stable/c/707607db2193591b68c0e70f814133472c185b1e'
  - url: 'https://git.kernel.org/stable/c/9a9e69155b2091b8297afaf1533b8d68a3096841'
  - url: 'https://git.kernel.org/stable/c/1c52ef00e391144334f10995985c2f256d4be982'
  - url: 'https://git.kernel.org/stable/c/a1d0f6cbb962af29586e3e65a4bced1a5e39221f'
  - url: 'https://git.kernel.org/stable/c/60a25ef8dacb3566b1a8c4de00572a498e2a3bf9'
tags:
  - cve.org
epss: 0.00162
epssPercentile: 0.04997
ingestedAt: '2026-10-21T12:48:53.662Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

wireguard: device: use exit_rtnl callback instead of manual rtnl_lock in pre_exit

wg_netns_pre_exit() manually acquires rtnl_lock() inside the
pernet .pre_exit callback.  This causes a hung task when another
thread holds rtnl_mutex - the cleanup_net workqueue (or the
setup_net failure rollback path) blocks indefinitely in
wg_netns_pre_exit() waiting to acquire the lock.

Convert to .exit_rtnl, introduced in commit 7a60d91c690b ("net:
Add ->exit_rtnl() hook to struct pernet_operations."), where the
framework already holds RTNL and batches all callbacks under a
single rtnl_lock()/rtnl_unlock() pair, eliminating the contention
window.

The rcu_assign_pointer(wg->creating_net, NULL) is safe to move
from .pre_exit to .exit_rtnl (which runs after synchronize_rcu())
because all RCU readers of creating_net either use maybe_get_net()
- which returns NULL for a dying namespace with zero refcount - or
access net->user_ns which remains valid throughout the entire
ops_undo_list sequence.

[ Jason: added __net_exit and __read_mostly annotations that were missing. ]

## Affected

- `Linux >= 900575aa33a3eaaef802b31de187a85c4a4b4bd0 < 707607db2193591b68c0e70f814133472c185b1e`
- `Linux >= 900575aa33a3eaaef802b31de187a85c4a4b4bd0 < 9a9e69155b2091b8297afaf1533b8d68a3096841`
- `Linux >= 900575aa33a3eaaef802b31de187a85c4a4b4bd0 < 1c52ef00e391144334f10995985c2f256d4be982`
- `Linux >= 900575aa33a3eaaef802b31de187a85c4a4b4bd0 < a1d0f6cbb962af29586e3e65a4bced1a5e39221f`
- `Linux >= 900575aa33a3eaaef802b31de187a85c4a4b4bd0 < 60a25ef8dacb3566b1a8c4de00572a498e2a3bf9`
- `Linux 363cc6efdbb54bb06cd5034a69b41aae974a736f`
- `Linux >= 5.7.7 < 5.8`
- `Linux 5.8`

## Remediation

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