CVE-2021-47091 mac80211: fix locking in ieee80211_start_ap error path
A locking error in the Linux kernel mac80211 subsystem can lead to a race condition, potentially causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-47091?
CVE-2021-47091 is a medium-severity vulnerability in Linux kernel, published on 4 Mar 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
mac80211: fix locking in ieee80211_start_ap error path
We need to hold the local->mtx to release the channel context, as even encoded by the lockdep_assert_held() there. Fix it.
Weakness: CWE-667
Which versions are affected by CVE-2021-47091?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-47091?
Apply the vendor's patch.
Is CVE-2021-47091 being exploited?
There is no known exploitation of CVE-2021-47091 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-47091, GHSA-c6q3-xgg3-276c, UBUNTU-CVE-2021-47091.