Use-after-free in Linux kernel - CVE-2026-64563
Published: August 4, 2026
Vulnerability identifier: #VU140934
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-2026-64563
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 a use-after-free in rhashtable_walk_next in the rhashtable iterator logic when resuming multi-fragment rhashtable walks across walk_stop and walk_start boundaries after a table restart. A local user can trigger a stale iterator pointer dereference to cause a denial of service.
Concrete affected call paths include netlink_diag and TIPC.
Affected software
Linux kernel
How to mitigate CVE-2026-64563
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3