Vulnerability in Linux

[ Description ]Official description

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211_hwsim: don't hand frames to mac80211 while stopping The code checks ->started for frames coming from wmediumd, but the radio can be stopped after the check and before frame delivery, causing mac80211 to hit the WARN_ON(!local->started). Expand the mutex for this case and synchronise against it when the radio is stopped to avoid being able to hit the warning with hwsim. Drop the error print that would've complicated the error path, it only triggers for allocation failures (already noisy) and malformed frames anyway.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund14 Oct 2026WID-SEC-2026-3951

  Linux Kernel: Multiple vulnerabilities Translated from German

  CVE-2026-98426CVE-2026-98416CVE-2026-98393+43 more CVEs

[ References ]References

• git.kernel.org/stable/c/2f59be7585dc81baa6f36b0035dd6848ea43d318
• git.kernel.org/stable/c/5c79ef616aa16af582fb2cb93b0f750975a0004f
• git.kernel.org/stable/c/5ce9b2bc9e73213e316a8c72400256a76bf41814
• git.kernel.org/stable/c/87840d4a3a21b1c19b867a80e16ba69dff284de2
• git.kernel.org/stable/c/c4e4fe330294e3936e0f4e15d6996468f8a45fb2
• git.kernel.org/stable/c/d7fa45d8123a7f794b93fc22dbcf19f38dc4d8cb