Use-after-free in Linux kernel - CVE-2026-97940
Published: September 28, 2026
Vulnerability identifier: #VU152531
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-97940
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, disclose sensitive information, or modify information.
The vulnerability exists due to a use-after-free in the IPv6 FIB route iterator walker handling when stopping an IPv6 route iterator while routes are deleted. A local user can trigger a race that leaves a freed walker on the IPv6 FIB walker list to cause a denial of service, disclose sensitive information, or modify information.
The same stop helper is used by /proc/net/ipv6_route and the BPF IPv6 route iterator.
Affected software
Linux kernel
How to mitigate CVE-2026-97940
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3