Double free in Linux kernel - CVE-2026-64581
Published: August 6, 2026
Vulnerability identifier: #VU141026
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-64581
CWE-ID: CWE-415
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a double free in xfrm_user_policy() when racing a per-socket policy change with packet transmission on a connected UDP socket. A local user can trigger concurrent socket operations to cause a denial of service.
The issue is reachable by an unprivileged user via a user and network namespace.
Affected software
Linux kernel
How to mitigate CVE-2026-64581
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3