wifi: mac80211: drain PS delivery work during station teardown
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.6.160, 6.12.113, 6.18.56, 7.2.10
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: drain PS delivery work during station teardown Removing an AP or mesh station can notify the driver and wake TXQs after the station has already been removed from the driver, and can update num_sta_ps and the power-save queues after station cleanup has purged them. sta_deliver_ps_frames() tests sta->dead only before it starts delivery. A worker that passes that test can be delayed while teardown sets sta->dead and removes the station from the driver; when it resumes it still runs the full delivery. The existing cancel_work_sync() sits near the end of __cleanup_single_sta(), after the final driver state transition and after PS accounting and queue purging, so it drains the worker only once the state it has to protect has already changed. Before commit d34ba2168a3c ("mac80211: don't delay station destruction") cleanup was deferred through the same ordered workqueue as the delivery work, which kept the two ordered. Cancel the work after setting sta->dead and before moving the driver state, and move the existing cancellation to the start of __cleanup_single_sta(). The first drain closes the driver-lifetime window; driver callbacks during the remaining state transitions can still queue drv_deliver_wk through ieee80211_sta_block_awake(), so retain the second drain at the start of __cleanup_single_sta(). That drain also covers insertion failures, which reach cleanup without setting sta->dead.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From d34ba2168a3c10e7301cca06069c39865b4c3ec6 · fixed in cbff71fe689f359ebd6a3eaded035ef75226afce; From d34ba2168a3c10e7301cca06069c39865b4c3ec6 · fixed in 843d3a1e6f25027ac85f88f67b95d82c67306dee; From d34ba2168a3c10e7301cca06069c39865b4c3ec6 · fixed in 772bd89304ecf057cc51ce4ce24a1a96ac9c8de3; From d34ba2168a3c10e7301cca06069c39865b4c3ec6 · fixed in 097460fcdd8ab9ef6f6018b2fdc29ba0ea499298; From d34ba2168a3c10e7301cca06069c39865b4c3ec6 · fixed in 67a9e80c3ca20c9044cd6ee72cd6278dd19b5023
- Linux Linux
3.14
- KernelLinux
From 3.14.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.113; From 6.13.0 · fixed in 6.18.56; From 6.19.0 · fixed in 7.2.10