CVE-2021-47367 virtio-net: fix pages leaking when building skb in big mode
A memory leak in the Linux kernel's virtio-net driver allows attackers to cause a denial of service by exhausting system memory.
- 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-2021-47367?
CVE-2021-47367 is a medium-severity denial of service vulnerability in Linux kernel, published on 21 May 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:
virtio-net: fix pages leaking when building skb in big mode
We try to use build_skb() if we had sufficient tailroom. But we forget to release the unused pages chained via private in big mode which will leak pages. Fixing this by release the pages after building the skb in big mode.
Weakness: CWE-119
Which versions are affected by CVE-2021-47367?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-47367?
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-2021-47367 being exploited?
There is no known exploitation of CVE-2021-47367 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-47367, GHSA-6qx7-m4qh-j7cp, UBUNTU-CVE-2021-47367.