CVE-2022-49942 Information

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\nannouncement 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().

Reference

https://git.kernel.org/stable/c/15bc8966b6d3a5b9bfe4c9facfa02f2b69b1e5f0 https://git.kernel.org/stable/c/1691a48aef0a82d1754b9853dae7e3f5cacdf70b https://git.kernel.org/stable/c/552ba102a6898630a7d16887f29e606d6fabe508 https://git.kernel.org/stable/c/66689c5c02acd4d76c28498fe220998610aec61e https://git.kernel.org/stable/c/864e280cb3a9a0f5212b16ef5057c4e692f7039d https://git.kernel.org/stable/c/cdb9a8da9b84800eb15506cd9363cf0cf059e677 https://git.kernel.org/stable/c/d9eb37db6a28b59a95a3461450ee209654c5f95b https://git.kernel.org/stable/c/dd649b49219a0388cc10fc40e4c2ea681566a780

Related CNNVD

CNNVD-202506-2229 (Published: 2025-06-18)