SB20260720104 - Use-after-free in Linux kernel mac80211

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-64117)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 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]

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2fb64f94f9afb774f2fa0c7835727d7a67f89f07
• https://git.kernel.org/stable/c/d71c841be5d9e586ee7f36c0dc8ed4db0d9a1349