Medium 5.5Published Jun 24, 2026

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

Updated under an hour ago (Oct 27, 2026, 7:50 AM ET)

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Exploited in the last 30 days

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: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Jun 24, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from f05837ed73d0c73e950b2d9f2612febb0d3d451e before 4048ed98860d3785645ebbd34f69566a6c7320c3; from f05837ed73d0c73e950b2d9f2612febb0d3d451e before 73a5af059905d171b398c8b2381632ee499948b5; from f05837ed73d0c73e950b2d9f2612febb0d3d451e before b3e005f16cd98f815429a87aef4c61e9c140779f; from f05837ed73d0c73e950b2d9f2612febb0d3d451e before 000e8454692cab9d1f1b80130e2870e355301d06; from f05837ed73d0c73e950b2d9f2612febb0d3d451e before 23308af722fefed00af5f238024c11710938fba3	CNA record
linux linux_kernel linux:linux_kernel	from 6.3 before 6.6.141; from 6.7 before 6.12.91; from 6.13 before 6.18.33; from 6.19 before 7.0.10	NVD

References

References

https://git.kernel.org/stable/c/4048ed98860d3785645ebbd34f69566a6c7320c3	patch
https://git.kernel.org/stable/c/73a5af059905d171b398c8b2381632ee499948b5	patch
https://git.kernel.org/stable/c/b3e005f16cd98f815429a87aef4c61e9c140779f	patch
https://git.kernel.org/stable/c/000e8454692cab9d1f1b80130e2870e355301d06	patch
https://git.kernel.org/stable/c/23308af722fefed00af5f238024c11710938fba3	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.