CVE-2026-72176
Low risk· EPSS 10%Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
In the Linux kernel, a bug was found in mm/damon/sysfs-schemes in the damon_sysfs_scheme_add_dirs() function, where the error path releases the tried_regions directory instead of the stats directory after a failed setup. This leads to a leak of the stats directory object and potential uninitialized memory dereference.
Risk Assessment
The risk includes memory leak and uninitialized memory dereference, which could lead to system crashes or unpredictable behavior. Configuration errors are rare, but the impact can be severe.
Recommendation
It is recommended to apply the Linux kernel patch that correctly releases the stats directory instead of the tried_regions directory in the error path. Monitor updates and deploy the fix in systems.
Other vulnerabilities in Linux kernel
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In the Linux kernel XFS filesystem, during directory tree repair, a self-referential directory may be detected. In such a case, the repair code attempts to lock the same inode twice (double iolock/ilock), leading to a deadlock. The fix detects this corner case and handles it appropriately.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: mm/damon/sysfs-schemes: put stats for scheme_add_dirs() internal error damon_sysfs_scheme_add_dirs() setup the tried_regions directory after the stats directory setup is completed. When the tried_regions directory setup is failed, the setup function ensures the reference for the tried regions directory is released. Hence the error path should put references on setup succeeded directory objects, starting from the stats directory. However, the error path is putting the tried_regions directory instead of the stats directory. As a direct result, the stats directory object is leaked. Worse yet, if the tried_regions directory setup failed from the initial allocation, the scheme->tried_regions field remains uninitialized. The following kobject_put(&scheme->tried_regions->kobj) call in the error path will dereference the uninitialized memory. The setup failures should not be common. But once it happens, the consequence is quite bad. Fix this issue by correctly putting the stats directory instead of the tried_regions directory. The issue was discovered [1] by Sashiko.