CVE-2021-3635 Denial of service in kernel
A local attacker with root privileges can crash the Linux kernel by issuing specific netfilter netflow commands, causing a system panic.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-3635?
CVE-2021-3635 is a medium-severity denial of service vulnerability in Fedoraproject Fedora, published on 13 Aug 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A flaw was found in the Linux kernel netfilter implementation in versions prior to 5.5-rc7. A user with root (CAP_SYS_ADMIN) access is able to panic the system when issuing netfilter netflow commands.
Weakness: CWE-119
Which versions are affected by CVE-2021-3635?
It affects 3 products.
Products include Fedoraproject Fedora, Linux kernel, Redhat Enterprise Linux.
How do I fix CVE-2021-3635?
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-2021-3635 being exploited?
There is no known exploitation of CVE-2021-3635 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as A-197614484, DEBIAN-CVE-2021-3635, GHSA-3rcv-mwcm-8g8f, PUB-A-197614484, UBUNTU-CVE-2021-3635.