CVE-2024-41049 filelock: fix potential use-after-free in posix_lock_inode
A race condition in the Linux kernel file locking mechanism can lead to a use-after-free, potentially allowing local attackers to execute code or escalate privileges.
- 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-2024-41049?
CVE-2024-41049 is a high-severity use after free vulnerability in Linux kernel, published on 29 Jul 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
filelock: fix potential use-after-free in posix_lock_inode
Light Hsieh reported a KASAN UAF warning in trace_posix_lock_inode(). The request pointer had been changed earlier to point to a lock entry that was added to the inode's list. However, before the tracepoint could fire, another task raced in and freed that lock.
Fix this by moving the tracepoint inside the spinlock, which should ensure that this doesn't happen.
Weakness: CWE-416
Which versions are affected by CVE-2024-41049?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-41049?
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-2024-41049 being exploited?
There is no known exploitation of CVE-2024-41049 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-41049, DEBIAN-CVE-2024-41049, GHSA-83vm-wg7j-77hw, UBUNTU-CVE-2024-41049.