Race condition in Linux kernel - CVE-2026-63858
Published: July 20, 2026
Vulnerability identifier: #VU138799
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-2026-63858
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 a race condition in nf_tables hook handling when deleting device hooks for chains or flowtables while netlink dump path readers access the RCU-protected hook list. A local user can trigger hook deletion and concurrent netlink dump operations to cause a denial of service.
The issue affects the netfilter nf_tables subsystem and involves device hook deletion transactions.
How to mitigate CVE-2026-63858
Install security update from vendor's repository.