Use-after-free in Linux kernel - CVE-2026-80519
Published: August 27, 2026
Vulnerability identifier: #VU145969
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80519
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to a use-after-free in the ovpn crypto completion callback handling in drivers/net/ovpn/io.c when processing crafted network packets. A remote attacker can send crafted packets that trigger asynchronous callback cleanup after peer release to execute arbitrary code.
The issue is caused by releasing the peer reference before key-slot cleanup and skb freeing are completed in the callback path.
Affected software
Linux kernel
How to mitigate CVE-2026-80519
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3