CVE-2024-57886

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.

This vulnerability is rated as Moderate because exploitation requires local access to trigger resource depletion, and the blast radius is confined to a denial of service via kernel memory exhaustion. In typical Red Hat Enterprise Linux deployments, the Data Access Monitoring (DAMON) framework is not enabled or actively managed by default. Additionally, only configurations actively interacting with the DAMON sysfs interface to configure targets are exposed to this memory leak, while older enterprise releases do not incorporate the affected logic.

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.