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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53126
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:27 UTC
Updated2026-07-14 15:26:52 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001570000 probability, percentile 0.052350000 (date 2026-07-14)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f05837ed73d0c73e950b2d9f2612febb0d3d451e 4048ed98860d3785645ebbd34f69566a6c7320c3 git Not specified
CNA Linux Linux affected f05837ed73d0c73e950b2d9f2612febb0d3d451e 73a5af059905d171b398c8b2381632ee499948b5 git Not specified
CNA Linux Linux affected f05837ed73d0c73e950b2d9f2612febb0d3d451e b3e005f16cd98f815429a87aef4c61e9c140779f git Not specified
CNA Linux Linux affected f05837ed73d0c73e950b2d9f2612febb0d3d451e 000e8454692cab9d1f1b80130e2870e355301d06 git Not specified
CNA Linux Linux affected f05837ed73d0c73e950b2d9f2612febb0d3d451e 23308af722fefed00af5f238024c11710938fba3 git Not specified
CNA Linux Linux affected 6.3 Not specified
CNA Linux Linux unaffected 6.3 semver Not specified
CNA Linux Linux unaffected 6.6.141 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/73a5af059905d171b398c8b2381632ee499948b5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/23308af722fefed00af5f238024c11710938fba3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4048ed98860d3785645ebbd34f69566a6c7320c3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/000e8454692cab9d1f1b80130e2870e355301d06 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b3e005f16cd98f815429a87aef4c61e9c140779f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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