Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mm/damon/dbgfs: fix 'struct pid' leaks in 'dbgfs_target_ids_write()' DAMON debugfs interface increases the reference counts of 'struct pid's for targets from the 'target_ids' file write callback ('dbgfs_target_ids_write()'), but decreases the counts only in DAMON monitoring termination callback ('dbgfs_before_terminate()'). Therefore, when 'target_ids' file is repeatedly written without DAMON monitoring start/termination, the reference count is not decreased and therefore memory for the 'struct pid' cannot be freed. This commit fixes this issue by decreasing the reference counts when 'target_ids' is written.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.15.0, < 5.15.13 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/ebb3f994dd92f8fb4d70c7541091216c1e10cb71Patch
- https://git.kernel.org/stable/c/ffe4a1ba1a82c416a6b3a09d46594f6a885ae141Patch
- https://git.kernel.org/stable/c/ebb3f994dd92f8fb4d70c7541091216c1e10cb71Patch
- https://git.kernel.org/stable/c/ffe4a1ba1a82c416a6b3a09d46594f6a885ae141Patch
FAQ
What is CVE-2021-46937?
CVE-2021-46937 is a vulnerability with a CVSS score of 5.5 (MEDIUM). In the Linux kernel, the following vulnerability has been resolved: mm/damon/dbgfs: fix 'struct pid' leaks in 'dbgfs_target_ids_write()' DAMON debugfs interface increases the reference counts of 'st...
How severe is CVE-2021-46937?
CVE-2021-46937 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-46937?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.