CVE-2026-53126 – blk-cgroup: fix disk reference leak in blkcg_maybe_throttle_current()

CVE ID :CVE-2026-53126

Published : June 24, 2026, 4:30 p.m. | 1 hour, 13 minutes ago

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.

Severity: 0.0 | NA

Visit the link for more details, such as CVSS details, affected products, timeline, and more…