Bug 2348349 (CVE-2022-49479)

Summary: CVE-2022-49479 kernel: mt76: fix tx status related use-after-free race on station removal
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-02-26 03:26:19 UTC 
In the Linux kernel, the following vulnerability has been resolved:

mt76: fix tx status related use-after-free race on station removal

There is a small race window where ongoing tx activity can lead to a skb
getting added to the status tracking idr after that idr has already been
cleaned up, which will keep the wcid linked in the status poll list.
Fix this by only adding status skbs if the wcid pointer is still assigned
in dev->wcid, which gets cleared early by mt76_sta_pre_rcu_remove
Comment 1 Avinash Hanwate 2025-02-26 07:16:32 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022604-CVE-2022-49479-520e@gregkh/T