SB20260720191 - Race condition in Linux kernel net ovpn driver

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-64043)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a race condition in the ovpn interface peer management code when adding a new peer via netlink during interface deletion. A local user can send a specially crafted netlink message to cause a denial of service.

The issue can cause the netdevice to hang and prevent its unregistration during teardown.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/097d62df38314c14b88fab9096f3461baf158e2b
• https://git.kernel.org/stable/c/982422b11e6f95f766a8cd2c2b1cbdb77e234a61
• https://git.kernel.org/stable/c/de9fec2a6645f5b4d23398cd870a33e2703728d9