Tracker / CVE-2022-49942
CVE-2022-49942
Medium 5.5
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 and versions
| linux | linux_kernel |
|---|---|
| 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 · 5.11 → 5.15.66 |
| linux | linux_kernel · 5.16 → 5.19.8 |
| linux | linux_kernel · 5.5 → 5.10.142 |
Analysis
This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.