CVE-2022-50852 wifi: mt76: mt7921: fix use after free in mt7921_acpi_read()
A use-after-free flaw in the Linux kernel mt7921 Wi-Fi driver allows local attackers to execute arbitrary code or cause a system crash.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-50852?
CVE-2022-50852 is an use after free vulnerability in Linux, published on 30 Dec 2025. 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:
wifi: mt76: mt7921: fix use after free in mt7921_acpi_read()
Don't dereference "sar_root" after it has been freed.
Which versions are affected by CVE-2022-50852?
How do I fix CVE-2022-50852?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2022-50852 being exploited?
There is no known exploitation of CVE-2022-50852 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2022-50852, GHSA-78hp-5r4f-844r, UBUNTU-CVE-2022-50852.