Bug 2373421 (CVE-2022-49942)

Summary: CVE-2022-49942 kernel: wifi: mac80211: Don't finalize CSA in IBSS mode if state is disconnected
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-06-18 12:01:59 UTC 
In the Linux kernel, the following vulnerability has been resolved:

wifi: mac80211: Don't finalize CSA in IBSS mode if state is disconnected

When we are not connected to a channel, sending channel "switch"
announcement doesn't make any sense.

The BSS list is empty in that case. This causes the for loop in
cfg80211_get_bss() to be bypassed, so the function returns NULL
(check line 1424 of net/wireless/scan.c), causing the WARN_ON()
in ieee80211_ibss_csa_beacon() to get triggered (check line 500
of net/mac80211/ibss.c), which was consequently reported on the
syzkaller dashboard.

Thus, check if we have an existing connection before generating
the CSA beacon in ieee80211_ibss_finish_csa().
Comment 1 Avinash Hanwate 2025-06-20 09:58:26 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025061807-CVE-2022-49942-8f93@gregkh/T