CVE-2026-46121
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
A vulnerability has been identified in the Linux kernel that allows a race condition between reading and writing the 'memcg_path' and 'path' files in the DAMON sysfs interface, leading to a use-after-free situation. A patch has been introduced to protect these operations from concurrent access.
Risk Assessment
This vulnerability could lead to unpredictable system behavior, including potential data leaks or application crashes when using the DAMON sysfs interface. Organizations should be aware of the risks associated with improper memory management.
Recommendation
It is recommended to update the Linux kernel to a version that includes the patch to mitigate the possibility of a use-after-free situation. Additionally, monitor the use of the DAMON sysfs interface in applications.
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Original NVD description (English source)
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 file is used by the writer, due to kernfs's open file locking. Nonetheless, doing the reads and writes with separate open files would be common. Fix it by protecting both the user-direct reads and writes with damon_sysfs_lock.