CVE-2026-31579

Service hang via WireGuard namespace teardown deadlock

Published Apr 24, 2026 · Updated Apr 24, 2026

Denial of service in the Linux Kernel allows attackers to hang network-namespace cleanup during WireGuard device teardown. The wg_netns_pre_exit() callback manually takes rtnl_lock() inside pernet .pre_exit, so cleanup waits indefinitely when another thread holds rtnl_mutex. Public records do not specify the privileges needed to reach the triggering teardown; the cleanup workqueue or setup rollback path can remain blocked indefinitely.

CVSS severityUnavailable
Unscored
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Denial of service in the Linux Kernel allows attackers to hang network-namespace cleanup during WireGuard device teardown. The wg_netns_pre_exit() callback manually takes rtnl_lock() inside pernet .pre_exit, so cleanup waits indefinitely when another thread holds rtnl_mutex. Public records do not specify the privileges needed to reach the triggering teardown; the cleanup workqueue or setup rollback path can remain blocked indefinitely.

The record

CVE
CVE-2026-31579
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1c52ef00e391144334f10995985c2f256d4be982
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9a9e69155b2091b8297afaf1533b8d68a3096841
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a1d0f6cbb962af29586e3e65a4bced1a5e39221f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1c52ef00e391144334f10995985c2f256d4be982; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9a9e69155b2091b8297afaf1533b8d68a3096841; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a1d0f6cbb962af29586e3e65a4bced1a5e39221f

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo