CVE-2022-4269 Denial of service in Linux kernel (TC subsystem)
A local unprivileged user can cause a CPU soft lockup and denial of service in the Linux kernel Traffic Control subsystem via specific networking configurations.
- 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-2022-4269?
CVE-2022-4269 is a medium-severity denial of service vulnerability in Linux kernel, published on 5 Dec 2022. 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 Traffic Control (TC) subsystem. Using a specific networking configuration (redirecting egress packets to ingress using TC action "mirred") a local unprivileged user could trigger a CPU soft lockup (ABBA deadlock) when the transport protocol in use (TCP or SCTP) does a retransmission, resulting in a denial of service condition.
Weakness: CWE-833
Which versions are affected by CVE-2022-4269?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-4269?
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-2022-4269 being exploited?
There is no known exploitation of CVE-2022-4269 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-4269, GHSA-xv49-pvqx-8xr6, UBUNTU-CVE-2022-4269.