CVE-2024-49902 jfs: check if leafidx greater than num leaves per dmap tree
A missing bounds check in the Linux kernel JFS filesystem allows an attacker to trigger an out-of-bounds access, potentially causing a system crash.
- 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-2024-49902?
CVE-2024-49902 is a high-severity memory corruption vulnerability in Linux kernel, published on 21 Oct 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: check if leafidx greater than num leaves per dmap tree
syzbot report a out of bounds in dbSplit, it because dmt_leafidx greater than num leaves per dmap tree, add a checking for dmt_leafidx in dbFindLeaf.
Shaggy: Modified sanity check to apply to control pages as well as leaf pages.
Which versions are affected by CVE-2024-49902?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-49902?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2024-49902 being exploited?
There is no known exploitation of CVE-2024-49902 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-52922, BELL-CVE-2024-49902, DEBIAN-CVE-2024-49902, GHSA-q2x4-35qf-p4qw, UBUNTU-CVE-2024-49902.