CVE-2026-53126

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxf05837ed73d0c73e950b2d9f2612febb0d3d451e < 4048ed98860d3785645ebbd34f69566a6c7320c3affected
LinuxLinuxf05837ed73d0c73e950b2d9f2612febb0d3d451e < 73a5af059905d171b398c8b2381632ee499948b5affected
LinuxLinuxf05837ed73d0c73e950b2d9f2612febb0d3d451e < b3e005f16cd98f815429a87aef4c61e9c140779faffected
LinuxLinuxf05837ed73d0c73e950b2d9f2612febb0d3d451e < 000e8454692cab9d1f1b80130e2870e355301d06affected
LinuxLinuxf05837ed73d0c73e950b2d9f2612febb0d3d451e < 23308af722fefed00af5f238024c11710938fba3affected
LinuxLinux6.3affected
LinuxLinux0 < 6.3unaffected
LinuxLinux6.6.141 <= 6.6.*unaffected
LinuxLinux6.12.91 <= 6.12.*unaffected
LinuxLinux6.18.33 <= 6.18.*unaffected
LinuxLinux7.0.10 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References