CVE-2024-38663 blk-cgroup: fix list corruption from resetting io stat
A memory corruption flaw in the Linux kernel's block cgroup subsystem allows attackers to cause a denial of service via list corruption during IO stat resets.
- 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-2024-38663?
CVE-2024-38663 is a high-severity memory corruption vulnerability in Linux kernel, published on 24 Jun 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:
blk-cgroup: fix list corruption from resetting io stat
Since commit 3b8cc6298724 ("blk-cgroup: Optimize blkcg_rstat_flush()"), each iostat instance is added to blkcg percpu list, so blkcg_reset_stats() can't reset the stat instance by memset(), otherwise the llist may be corrupted.
Fix the issue by only resetting the counter part.
Which versions are affected by CVE-2024-38663?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-38663?
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-2024-38663 being exploited?
There is no known exploitation of CVE-2024-38663 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-38663, DEBIAN-CVE-2024-38663, GHSA-jw6j-6fr8-787w, UBUNTU-CVE-2024-38663.