Use-after-free in Linux kernel - CVE-2026-64117
Published: July 20, 2026
Vulnerability identifier: #VU138516
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-2026-64117
CWE-ID: CWE-416
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 use-after-free in ieee80211_invoke_fast_rx() when processing mesh forwarding in the unicast forward path. A local user can trigger mesh data handling that causes freed memory to be accessed to cause a denial of service.
The issue occurs because skb->cb storage is reused by mesh forwarding code before the caller finishes consuming the RX status, and the no-route path can free the skb before the stale status is accessed.
How to mitigate CVE-2026-64117
Install security update from vendor's repository.