CVE-2021-46996 netfilter: nftables: Fix a memleak from userdata error path in new objects
A memory leak in the Linux kernel's nftables subsystem allows attackers to cause a denial of service by triggering an error path during object creation.
- 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-2021-46996?
CVE-2021-46996 is a medium-severity denial of service vulnerability in Linux kernel, published on 28 Feb 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:
netfilter: nftables: Fix a memleak from userdata error path in new objects
Release object name if userdata allocation fails.
Weakness: CWE-401
Which versions are affected by CVE-2021-46996?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-46996?
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-2021-46996 being exploited?
There is no known exploitation of CVE-2021-46996 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-46996, GHSA-4q6w-gxhv-h434, UBUNTU-CVE-2021-46996.