{"id":"CVE-2026-53126","title":"blk-cgroup: fix disk reference leak in blkcg_maybe_throttle_current()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nblk-cgroup: fix disk reference leak in blkcg_maybe_throttle_current()\n\nAdd the missing put_disk() on the error path in\nblkcg_maybe_throttle_current(). When blkcg lookup…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= f05837ed73d0c73e950b2d9f2612febb0d3d451e < 4048ed98860d3785645ebbd34f69566a6c7320c3","Linux >= f05837ed73d0c73e950b2d9f2612febb0d3d451e < 73a5af059905d171b398c8b2381632ee499948b5","Linux >= f05837ed73d0c73e950b2d9f2612febb0d3d451e < b3e005f16cd98f815429a87aef4c61e9c140779f","Linux >= f05837ed73d0c73e950b2d9f2612febb0d3d451e < 000e8454692cab9d1f1b80130e2870e355301d06","Linux >= f05837ed73d0c73e950b2d9f2612febb0d3d451e < 23308af722fefed00af5f238024c11710938fba3","Linux 6.3"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:20:10.986570Z"},"published":"2026-06-24","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:24:03.003Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53126","references":[{"url":"https://git.kernel.org/stable/c/4048ed98860d3785645ebbd34f69566a6c7320c3"},{"url":"https://git.kernel.org/stable/c/73a5af059905d171b398c8b2381632ee499948b5"},{"url":"https://git.kernel.org/stable/c/b3e005f16cd98f815429a87aef4c61e9c140779f"},{"url":"https://git.kernel.org/stable/c/000e8454692cab9d1f1b80130e2870e355301d06"},{"url":"https://git.kernel.org/stable/c/23308af722fefed00af5f238024c11710938fba3"}],"tags":["cve.org"],"epss":0.00114,"epssPercentile":0.01485,"ingestedAt":"2026-11-06T16:57:43.285Z","slug":"CVE-2026-53126","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nblk-cgroup: fix disk reference leak in blkcg_maybe_throttle_current()\n\nAdd the missing put_disk() on the error path in\nblkcg_maybe_throttle_current(). When blkcg lookup, blkg lookup, or\nblkg_tryget() fails, the function jumps to the out label which only\ncalls rcu_read_unlock() but does not release the disk reference acquired\nby blkcg_schedule_throttle() via get_device(). Since current->throttle_disk\nis already set to NULL before the lookup, blkcg_exit() cannot release\nthis reference either, causing the disk to never be freed.\n\nRestore the reference release that was present as blk_put_queue() in the\noriginal code but was inadvertently dropped during the conversion from\nrequest_queue to gendisk.\n\n## Affected\n\n- `Linux >= f05837ed73d0c73e950b2d9f2612febb0d3d451e < 4048ed98860d3785645ebbd34f69566a6c7320c3`\n- `Linux >= f05837ed73d0c73e950b2d9f2612febb0d3d451e < 73a5af059905d171b398c8b2381632ee499948b5`\n- `Linux >= f05837ed73d0c73e950b2d9f2612febb0d3d451e < b3e005f16cd98f815429a87aef4c61e9c140779f`\n- `Linux >= f05837ed73d0c73e950b2d9f2612febb0d3d451e < 000e8454692cab9d1f1b80130e2870e355301d06`\n- `Linux >= f05837ed73d0c73e950b2d9f2612febb0d3d451e < 23308af722fefed00af5f238024c11710938fba3`\n- `Linux 6.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}