CVE-2026-53126
UnknownSummary
A vulnerability has been identified in the Linux kernel related to a disk reference leak in the blkcg_maybe_throttle_current() function. The issue is due to a missing put_disk() call on the error path, leading to unreleased disk references.
Risk Assessment
Organizations may face issues with disk resource management, potentially leading to resource exhaustion and system failures.
Recommendation
It is recommended to update the Linux kernel to the latest version to mitigate this vulnerability and restore proper disk reference management.
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.