Use-after-free in Linux kernel - CVE-2026-43374
Published: May 9, 2026
Vulnerability identifier: #VU130809
CSH Severity: Low
CVSS v4: 5.7 [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]
CVE-ID: CVE-2026-43374
CWE-ID: CWE-416
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 use-after-free in remove_nh_grp_entry when removing a nexthop from a group while RCU readers still reference the old group. A local user can trigger concurrent nexthop group updates and access the stale entry to cause a denial of service.
The issue involves freed percpu statistics being dereferenced by RCU readers before the grace period completes.
Affected software
Linux kernel
How to mitigate CVE-2026-43374
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3