CVE-2022-49942: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.3% chance of exploitation in the next 30 days.

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

• Linux Linux Kernel: from 3.13, before 4.9.328 (fixed in 4.9.328); from 4.10, before 4.14.293 (fixed in 4.14.293); from 4.15, before 4.19.258 (fixed in 4.19.258); from 4.20, before 5.4.213 (fixed in 5.4.213); from 5.5, before 5.10.142 (fixed in 5.10.142); from 5.11, before 5.15.66 (fixed in 5.15.66); …

Published 2025-06-18. Last modified 2026-06-17.