SB20260720193 - Use-after-free in Linux kernel net ovpn driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-64045)

CWE-ID: CWE-416 - Use After Free

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 use-after-free in ovpn_tcp_close() in the OpenVPN TCP transport handling code when closing a TCP socket concurrently with peer removal. A local user can trigger peer removal while closing the TCP file descriptor to cause a denial of service.

The issue occurs because a peer pointer obtained during an RCU read-side critical section is used after that section has ended.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/775d8d7ad02aa345e1588424a6a8b9ae49fb9012
• https://git.kernel.org/stable/c/d3ef441907fca7c340979e577a3db3bb634bf166
• https://git.kernel.org/stable/c/e5460eb7238c19d651a9b22b2378b587033a4095