wifi: mac80211: ibss: wait for in-flight TX on disconnect

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Summary

CVECVE-2026-93804
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-24 17:17:13 UTC
Updated2026-09-25 13:17:21 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: ibss: wait for in-flight TX on disconnect While leaving an IBSS in ieee80211_ibss_disconnect() mac80211 flushes stations, turns the carrier off and immediately tells the driver to leave as well. While there may be synchronize_net() in station flush and in this code later, packets can still be transmitted due to cross-CPU race conditions after carrier off is set. Therefore, it's possible for a race to happen where a TX to the driver occurs while or after telling it to leave the IBSS. This can be confusing to drivers, and in the case of iwlwifi leads to an attempt to use invalid queues. Move netif_carrier_off() to occur before sta_info_flush() during IBSS disconnect, and add synchronize_net() if flushing didn't, so that the synchronize_net() always happens between turning the carrier off and telling the driver, avoiding this race.

Risk And Classification

EPSS: 0.001660000 probability, percentile 0.051790000 (date 2026-09-25)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 86a2ea4134b48f6371103cfceb521bf2d2bf76cd 20a3fb5e1a95caa34896853ca17a50d21c754969 git Not specified
CNA Linux Linux affected 86a2ea4134b48f6371103cfceb521bf2d2bf76cd b3451e6971248250312ad32dd7f63cc9f0a925f5 git Not specified
CNA Linux Linux affected 86a2ea4134b48f6371103cfceb521bf2d2bf76cd d0e69d9afa59b93c30294eba89b1f15f69e91105 git Not specified
CNA Linux Linux affected 3.3 Not specified
CNA Linux Linux unaffected 3.3 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d0e69d9afa59b93c30294eba89b1f15f69e91105 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/20a3fb5e1a95caa34896853ca17a50d21c754969 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b3451e6971248250312ad32dd7f63cc9f0a925f5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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