Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: fix disk reference leak in blkcg_maybe_throttle_current() Add the missing put_disk() on the error path in blkcg_maybe_throttle_current(). When blkcg lookup, blkg lookup, or blkg_tryget() fails, the function jumps to the out label which only calls rcu_read_unlock() but does not release the disk reference acquired by blkcg_schedule_throttle() via get_device(). Since current->throttle_disk is already set to NULL before the lookup, blkcg_exit() cannot release this reference either, causing the disk to never be freed. Restore the reference release that was present as blk_put_queue() in the original code but was inadvertently dropped during the conversion from request_queue to gendisk.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.3, < 6.6.141 |
References
- https://git.kernel.org/stable/c/000e8454692cab9d1f1b80130e2870e355301d06Patch
- https://git.kernel.org/stable/c/23308af722fefed00af5f238024c11710938fba3Patch
- https://git.kernel.org/stable/c/4048ed98860d3785645ebbd34f69566a6c7320c3Patch
- https://git.kernel.org/stable/c/73a5af059905d171b398c8b2381632ee499948b5Patch
- https://git.kernel.org/stable/c/b3e005f16cd98f815429a87aef4c61e9c140779fPatch
FAQ
What is CVE-2026-53126?
CVE-2026-53126 is a vulnerability with a CVSS score of 5.5 (MEDIUM). In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: fix disk reference leak in blkcg_maybe_throttle_current() Add the missing put_disk() on the error path in blkcg_maybe_...
How severe is CVE-2026-53126?
CVE-2026-53126 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-2026-53126?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.