Race condition in Linux kernel - CVE-2026-64119
Published: July 20, 2026
Vulnerability identifier: #VU138518
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-64119
CWE-ID: CWE-362
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 improper concurrent modification of an rcu-protected list in l2tp_session_unhash() when handling concurrent L2TP session get, create, and delete operations on the same tunnel. A local user can issue crafted concurrent netlink commands to cause a denial of service.
Exploitation can pin a host CPU indefinitely and stall RCU grace periods, and the issue is reachable from a standard unshare sandbox when l2tp_core is loaded.
How to mitigate CVE-2026-64119
Install security update from vendor's repository.