CVE-2011-2491 Denial of service in n/a
Local users can cause a system hang in the Linux kernel NFS client via a specific flock system call, requiring kernel updates to mitigate.
- 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-2011-2491?
CVE-2011-2491 is a medium-severity denial of service vulnerability in Linux kernel, published on 1 Mar 2013. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The Network Lock Manager (NLM) protocol implementation in the NFS client functionality in the Linux kernel before 3.0 allows local users to cause a denial of service (system hang) via a LOCK_UN flock system call.
Weakness: CWE-400
Which versions are affected by CVE-2011-2491?
It affects 4 products.
Products include Linux kernel, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Server, Redhat Enterprise Linux Workstation.
How do I fix CVE-2011-2491?
Upgrade to a fixed version.
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-2011-2491 being exploited?
There is no known exploitation of CVE-2011-2491 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as GHSA-23hf-jhww-867g.