CVE-2026-53126
Low risk· EPSS 5%Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
A disk reference leak was found in the Linux kernel's blkcg_maybe_throttle_current() function. Missing put_disk() on the error path prevents disk release, leading to resource exhaustion.
Risk Assessment
The organization may face system instability or denial of service (DoS) due to unreleased disk references, preventing proper resource cleanup.
Recommendation
Immediately update the Linux kernel to a version containing the fix (commit adding put_disk() on the error path).
Original NVD description (English source)
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.