CVE-2026-46121

Technical Description

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

mm/damon/sysfs-schemes: protect memcg_path kfree() with damon_sysfs_lock

Patch series "mm/damon/sysfs-schemes: fix use-after-free for [memcg_]path".

Reads of 'memcg_path' and 'path' files in DAMON sysfs interface could race

with their writes, results in use-after-free. Fix those.

This patch (of 2):

damon_sysfs_scheme_filter->mmecg_path can be read and written by users,

via DAMON sysfs memcg_path file. It can also be indirectly read, for the

parameters {on,off}line committing to DAMON. The reads for parameters

committing are protected by damon_sysfs_lock to avoid the sysfs files

being destroyed while any of the parameters are being read. But the

user-driven direct reads and writes are not protected by any lock, while

the write is deallocating the memcg_path-pointing buffer. As a result,

the readers could read the already freed buffer (user-after-free). Note

that the user-reads don't race when the same open f

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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.

Affected Products

References