wifi: mac80211: Fix UAF in ieee80211_scan_rx()
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.8epss 0.3%
exploitation probability
0.3%top 83% of all CVEs
observed exploitation
nono source reports it
In the Linux kernel, the following vulnerability has been resolved:
wifi: mac80211: Fix UAF in ieee80211_scan_rx()
ieee80211_scan_rx() tries to access scan_req->flags after a
null check, but a UAF is observed when the scan is completed
and __ieee80211_scan_completed() executes, which then calls
cfg80211_scan_done() leading to the freeing of scan_req.
Since scan_req is rcu_dereference()'d, prevent the racing in
__ieee80211_scan_completed() by ensuring that from mac80211's
POV it is no longer accessed from an RCU read critical section
before we call cfg80211_scan_done().
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/4abc8c07a065ecf771827bde3c63fbbe4aa0c08bhttps://git.kernel.org/stable/c/5d20c6f932f2758078d0454729129c894fe353e7https://git.kernel.org/stable/c/60deb9f10eec5c6a20252ed36238b55d8b614a2chttps://git.kernel.org/stable/c/6eb181a64fdabf10be9e54de728876667da20255https://git.kernel.org/stable/c/78a07732fbb0934d14827d8f09b9aa6a49ee1aa9https://git.kernel.org/stable/c/9ad48cbf8b07f10c1e4a7a262b32a9179ae9dd2dhttps://git.kernel.org/stable/c/c0445feb80a4d0854898118fa01073701f8d356bhttps://git.kernel.org/stable/c/e0ff39448cea654843744c72c6780293c5082cb1