CVE-2024-49902

A flaw was found in the Linux kernel's JFS file system. A local attacker could exploit an out-of-bounds write vulnerability in the dbSplit and dbFindLeaf functions due to improper validation of leaf indices. This could lead to a denial of service (DoS) or potentially information disclosure.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this issue, prevent the jfs kernel module from loading if the JFS filesystem is not in use. This can be achieved by creating a modprobe configuration file.

Create /etc/modprobe.d/disable-jfs.conf with the following content: install jfs /bin/true blacklist jfs

After creating the file, regenerate the initramfs and reboot the system for the changes to take effect. dracut -f -v reboot

This mitigation may impact systems that rely on the JFS filesystem.