CVE-2009-4141 Use after free in n/a
Local attackers can gain privileges via a use-after-free in the Linux kernel's fasync_helper function when manipulating file locks and async flags.
- 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-2009-4141?
CVE-2009-4141 is a high-severity use after free vulnerability in Linux kernel, published on 19 Jan 2010. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Use-after-free vulnerability in the fasync_helper function in fs/fcntl.c in the Linux kernel before 2.6.33-rc4-git1 allows local users to gain privileges via vectors that include enabling O_ASYNC (aka FASYNC or FIOASYNC) on a locked file, and then closing this file.
Weakness: CWE-399
Which versions are affected by CVE-2009-4141?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2009-4141?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2009-4141 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2009-4141 exists.
Public exploit code: 1 Exploit-DB entry.
Other vulnerabilities in Linux kernel
Sources
Also known as GHSA-45gx-j644-hhf5.