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Unrated severityNVD Advisory· Published Jun 18, 2025

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

CVE-2022-49942

Description

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().

Affected products

119

Patches

0

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

8

News mentions

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