CVE-2026-98423
Published Oct 14, 2026
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.
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References
Other References
https://git.kernel.org/stable/c/2f59be7585dc81baa6f36b0035dd6848ea43d318
https://git.kernel.org/stable/c/5c79ef616aa16af582fb2cb93b0f750975a0004f
https://git.kernel.org/stable/c/5ce9b2bc9e73213e316a8c72400256a76bf41814
https://git.kernel.org/stable/c/87840d4a3a21b1c19b867a80e16ba69dff284de2
https://git.kernel.org/stable/c/c4e4fe330294e3936e0f4e15d6996468f8a45fb2
https://git.kernel.org/stable/c/d7fa45d8123a7f794b93fc22dbcf19f38dc4d8cb
Frequently Asked Questions
What is CVE-2026-98423? +
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.
How do I check if I'm vulnerable to CVE-2026-98423? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.