CVE-2022-49672 net: tun: unlink NAPI from device on destruction
A race condition in the Linux kernel's tun driver can lead to a use-after-free scenario, potentially causing a system crash or 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-2022-49672?
CVE-2022-49672 is a high-severity vulnerability in Linux kernel, published on 26 Feb 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:
net: tun: unlink NAPI from device on destruction
Syzbot found a race between tun file and device destruction. NAPIs live in struct tun_file which can get destroyed before the netdev so we have to del them explicitly. The current code is missing deleting the NAPI if the queue was detached first.
Which versions are affected by CVE-2022-49672?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-49672?
Apply the vendor's patch.
Is CVE-2022-49672 being exploited?
There is no known exploitation of CVE-2022-49672 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-49672, GHSA-g69g-p5jr-h7qf, UBUNTU-CVE-2022-49672.