Use-after-free in Linux kernel - CVE-2026-64044
Published: July 20, 2026
Vulnerability identifier: #VU138605
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-64044
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in ovpn_nl_peer_new_doit() and the ovpn peer reference handling when processing peer creation error paths for TCP peers. A local user can trigger concurrent socket activity during peer creation failure handling to cause a denial of service.
The issue affects the TCP path, where the peer may remain reachable through sk_user_data before detachment, and exploitation depends on concurrent in-flight userspace or strparser-driven access to the peer.
How to mitigate CVE-2026-64044
Install security update from vendor's repository.