CVE-2021-28950 Denial of service in n/a
A local attacker can cause a CPU stall in the Linux kernel FUSE subsystem by triggering a retry loop on a bad inode, leading to denial of service.
- 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-2021-28950?
CVE-2021-28950 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 20 Mar 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An issue was discovered in fs/fuse/fuse_i.h in the Linux kernel before 5.11.8. A "stall on CPU" can occur because a retry loop continually finds the same bad inode, aka CID-775c5033a0d1.
Weakness: CWE-834
Which versions are affected by CVE-2021-28950?
It affects 3 products.
Products include Debian Debian Linux, Fedoraproject Fedora, Linux kernel.
How do I fix CVE-2021-28950?
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-2021-28950 being exploited?
There is no known exploitation of CVE-2021-28950 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as AZL-6538, DEBIAN-CVE-2021-28950, GHSA-chvf-mx8g-hjh2, UBUNTU-CVE-2021-28950.