CVE-2024-26763 dm-crypt: don't modify the data when using authenticated encryption
A local attacker can corrupt encrypted data and potentially crash the system by modifying data during O_DIRECT writes in dm-crypt authenticated encryption.
- 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-2024-26763?
CVE-2024-26763 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:
dm-crypt: don't modify the data when using authenticated encryption
It was said that authenticated encryption could produce invalid tag when the data that is being encrypted is modified [1]. So, fix this problem by copying the data into the clone bio first and then encrypt them inside the clone bio.
This may reduce performance, but it is needed to prevent the user from corrupting the device by writing data with O_DIRECT and modifying them at the same time.
[1] https://lore.kernel.org/all/[email protected]/T/
Weakness: CWE-787
Which versions are affected by CVE-2024-26763?
It affects 2 products.
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2024-26763?
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-2024-26763 being exploited?
There is no known exploitation of CVE-2024-26763 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as BELL-CVE-2024-26763, DEBIAN-CVE-2024-26763, GHSA-xvjp-2q6g-h878, UBUNTU-CVE-2024-26763.