CVE-2024-44938 jfs: Fix shift-out-of-bounds in dbDiscardAG
A shift-out-of-bounds error in the JFS filesystem can cause a kernel crash, 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-2024-44938?
CVE-2024-44938 is a medium-severity vulnerability in Linux kernel, published on 26 Aug 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:
jfs: Fix shift-out-of-bounds in dbDiscardAG
When searching for the next smaller log2 block, BLKSTOL2() returned 0, causing shift exponent -1 to be negative.
This patch fixes the issue by exiting the loop directly when negative shift is found.
Weakness: CWE-787
Which versions are affected by CVE-2024-44938?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-44938?
Apply the vendor's patch.
Is CVE-2024-44938 being exploited?
There is no known exploitation of CVE-2024-44938 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-49111, BELL-CVE-2024-44938, DEBIAN-CVE-2024-44938, GHSA-8f4h-jjh9-fxrx, UBUNTU-CVE-2024-44938.