CVE-2026-64043

Netdevice hang via ovpn peer-add race

Published Jul 19, 2026 · Updated Jul 19, 2026

Race condition in Linux Kernel 6.16 allows local users to hang an ovpn netdevice by racing peer creation with interface deletion. ovpn_dellink() frees existing peers and queues deregistration, but a concurrent CMD_PEER_NEW request in ovpn_peer_add() reacquires a netdevice reference after that cleanup. Triggering requires local netlink control of an ovpn interface; the retained reference prevents device unregistration rather than crashing or rebooting the host.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux Kernel 6.16 allows local users to hang an ovpn netdevice by racing peer creation with interface deletion. ovpn_dellink() frees existing peers and queues deregistration, but a concurrent CMD_PEER_NEW request in ovpn_peer_add() reacquires a netdevice reference after that cleanup. Triggering requires local netlink control of an ovpn interface; the retained reference prevents device unregistration rather than crashing or rebooting the host.

The record

CVE
CVE-2026-64043
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=6.16
  2. Affected versionversion=80747caef33d77f5c1b3d24644e6d7dae69066b5 <097d62df38314c14b88fab9096f3461baf158e2b
  3. Affected versionversion=80747caef33d77f5c1b3d24644e6d7dae69066b5 <982422b11e6f95f766a8cd2c2b1cbdb77e234a61
  4. Affected versionversion=80747caef33d77f5c1b3d24644e6d7dae69066b5 <de9fec2a6645f5b4d23398cd870a33e2703728d9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.16; version=80747caef33d77f5c1b3d24644e6d7dae69066b5 <097d62df38314c14b88fab9096f3461baf158e2b; version=80747caef33d77f5c1b3d24644e6d7dae69066b5 <982422b11e6f95f766a8cd2c2b1cbdb77e234a61; version=80747caef33d77f5c1b3d24644e6d7dae69066b5 <de9fec2a6645f5b4d23398cd870a33e2703728d9

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.

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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

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

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Your stack

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