CVE-2026-53126
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.
How to fix
- linux linux_kernel6.6.141, 6.12.91, 6.18.33, 7.0.10 or later
- git.kernel.org/stable/c/000e8454692cab9d1f1b80130e2870e355301d06
- git.kernel.org/stable/c/23308af722fefed00af5f238024c11710938fba3
- git.kernel.org/stable/c/4048ed98860d3785645ebbd34f69566a6c7320c3
- git.kernel.org/stable/c/73a5af059905d171b398c8b2381632ee499948b5
- git.kernel.org/stable/c/b3e005f16cd98f815429a87aef4c61e9c140779f
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 6.3 ≤ v < 6.6.141, 6.7 ≤ v < 6.12.91, 6.13 ≤ v < 6.18.33, 6.19 ≤ v < 7.0.10 | 6.6.141, 6.12.91, 6.18.33, 7.0.10 |
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