CVE-2024-26697 nilfs2: fix data corruption in dsync block recovery for small block sizes
An attacker with local access can trigger data corruption and leak uninitialized memory during nilfs2 recovery on systems with small block sizes.
- 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-2024-26697?
CVE-2024-26697 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 3 Apr 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:
nilfs2: fix data corruption in dsync block recovery for small block sizes
The helper function nilfs_recovery_copy_block() of nilfs_recovery_dsync_blocks(), which recovers data from logs created by data sync writes during a mount after an unclean shutdown, incorrectly calculates the on-page offset when copying repair data to the file's page cache. In environments where the block size is smaller than the page size, this flaw can cause data corruption and leak uninitialized memory bytes during the recovery process.
Fix these issues by correcting this byte offset calculation on the page.
Weakness: CWE-787
Which versions are affected by CVE-2024-26697?
It affects 2 products.
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2024-26697?
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-2024-26697 being exploited?
There is no known exploitation of CVE-2024-26697 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as BELL-CVE-2024-26697, DEBIAN-CVE-2024-26697, GHSA-xg7r-7865-v6c7, UBUNTU-CVE-2024-26697.