CVE-2022-49057 block: null_blk: end timed out poll request
A memory leak in the Linux kernel null_blk driver can lead to resource exhaustion and denial of service when poll requests time out.
- 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-2022-49057?
CVE-2022-49057 is a medium-severity denial of service 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:
block: null_blk: end timed out poll request
When poll request is timed out, it is removed from the poll list, but not completed, so the request is leaked, and never get chance to complete.
Fix the issue by ending it in timeout handler.
Weakness: CWE-401
Which versions are affected by CVE-2022-49057?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-49057?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2022-49057 being exploited?
There is no known exploitation of CVE-2022-49057 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-49057, GHSA-4gp8-rv6j-2qpw, UBUNTU-CVE-2022-49057.