CVE-2026-93804

/// Technical description

In 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.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References