CVE-2022-49942

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().

• linux linux kernel (>= 3.13 < 4.9.328) • linux linux kernel (>= 4.10 < 4.14.293) • linux linux kernel (>= 4.15 < 4.19.258) • linux linux kernel (>= 4.20 < 5.4.213) • linux linux kernel (>= 5.5 < 5.10.142) • linux linux kernel (>= 5.11 < 5.15.66) • linux linux kernel (>= 5.16 < 5.19.8) • linux linux kernel 6.0