CVE-2026-64239

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

mm/damon/sysfs-schemes: delete tried region in regions_rmdirs()

DAMON sysfs maintains the DAMOS tried region directory objects via a

linked list. When the user requests refresh of the directories, DAMON

sysfs removes all the region directories first, and then generate updated

regions directory on the empty space. The removal function

(damon_sysfs_scheme_regions_rm_dirs()) only puts the kobj objects.

Deletion of the container region object from the linked list is done

inside the kobj release callback function.

If somehow the callback invocation is delayed, the list will contain

regions list that gonna be freed. If the updated region directories

creation is started in this situation, the list can be corrupted and

use-after-free can happen.

Because the kobj objects are managed by only DAMON sysfs, the issue cannot

happen in normal situation. But, such delays can be made on kernels that

built with CONFIG_DEBUG_KOB

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References