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.
Affected versions
Linux kernel versions
3.1
and later are affected. Fixed in
6.1.189,
6.6.158,
6.12.112,
6.18.54,
7.2.8,
7.3-rc4
and their respective stable series.
References
6 totalFrequently asked questions
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What is CVE-2026-98423?
CVE-2026-98423 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 3.1 onward and has been patched in 6.1.189, 6.6.158, 6.12.112 and others. CVE-2026-98423 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-98423?
Yes. CVE-2026-98423 has been patched. Fixed versions include 6.1.189, 6.6.158, 6.12.112 and others. If you are running Linux kernel 3.1 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-98423 actively exploited?
No. CVE-2026-98423 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.