CVE-2024-57886 mm/damon/core: fix new damon_target objects leaks on damon_commit_targets()
A memory leak in the Linux kernel DAMON subsystem allows local attackers to exhaust system memory via the sysfs interface, causing denial of service.
- 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-2024-57886?
CVE-2024-57886 is a medium-severity denial of service vulnerability in Linux kernel, published on 15 Jan 2025. 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:
mm/damon/core: fix new damon_target objects leaks on damon_commit_targets()
Patch series "mm/damon/core: fix memory leaks and ignored inputs from damon_commit_ctx()".
Due to two bugs in damon_commit_targets() and damon_commit_schemes(), which are called from damon_commit_ctx(), some user inputs can be ignored, and some mmeory objects can be leaked. Fix those.
Note that only DAMON sysfs interface users are affected. Other DAMON core API user modules that more focused more on simple and dedicated production usages, including DAMON_RECLAIM and DAMON_LRU_SORT are not using the buggy function in the way, so not affected.
This patch (of 2):
When new DAMON targets are added via damon_commit_targets(), the newly created targets are not deallocated when updating the internal data (damon_commit_target()) is failed. Worse yet, even if the setup is successfully done, the new target is not linked to the context. Hence, the new targets are always leaked regardless of the internal data setup failure. Fix the leaks.
Weakness: CWE-401
Which versions are affected by CVE-2024-57886?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-57886?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2024-57886 being exploited?
There is no known exploitation of CVE-2024-57886 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-57886, DEBIAN-CVE-2024-57886, GHSA-6xcg-rcf7-q8xw, UBUNTU-CVE-2024-57886.