{"id":"CVE-2023-53823","revision":null,"records":[{"revision":"1bb7c0a031424e559cc0f1fcf48dbd5a","observedAt":"2026-10-30T13:45:33.454+00:00","statement":{"source":"cve-program","id":"CVE-2023-53823","aliases":[],"title":"block/rq_qos: protect rq_qos apis with a new lock","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nblock/rq_qos: protect rq_qos apis with a new lock\n\ncommit 50e34d78815e (\"block: disable the elevator int del_gendisk\")\nmove rq_qos_exit() from disk_release() to del_gendisk(), this will\nintroduce some problems:\n\n1) If rq_qos_add() is triggered by enabling iocost/iolatency through\n cgroupfs, then it can concurrent with del_gendisk(), it's not safe to\n write 'q->rq_qos' concurrently.\n\n2) Activate cgroup policy that is relied on rq_qos will call\n rq_qos_add() and blkcg_activate_policy(), and if rq_qos_exit() is\n called in the middle, null-ptr-dereference will be triggered in\n blkcg_activate_policy().\n\n3) blkg_conf_open_bdev() can call blkdev_get_no_open() first to find the\n disk, then if rq_qos_exit() from del_gendisk() is done before\n rq_qos_add(), then memory will be leaked.\n\nThis patch add a new disk level mutex 'rq_qos_mutex':\n\n1) The lock will protect rq_qos_exit() directly.\n\n2) For wbt that doesn't relied on blk-cgroup, rq_qos_add() can only be\n called from disk initialization for now because wbt can't be\n destructed until rq_qos_exit(), so it's safe not to protect wbt for\n now. Hoever, in case that rq_qos dynamically destruction is supported\n in the furture, this patch also protect rq_qos_add() from wbt_init()\n directly, this is enough because blk-sysfs already synchronize\n writers with disk removal.\n\n3) For iocost and iolatency, in order to synchronize disk removal and\n cgroup configuration, the lock is held after blkdev_get_no_open()\n from blkg_conf_open_bdev(), and is released in blkg_conf_exit().\n In order to fix the above memory leak, disk_live() is checked after\n holding the new lock.","state":0,"publishedAt":"2025-12-09T01:29:36.343+00:00","modifiedAt":"2026-10-30T12:17:36.868+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"block/blk-cgroup.c\",\n \"block/blk-core.c\",\n \"block/blk-rq-qos.c\",\n \"block/blk-wbt.c\",\n \"include/linux/blkdev.h\"\n ],\n \"versions\": [\n {\n \"version\": \"50e34d78815e474d410f342fbe783b18192ca518\",\n \"lessThan\": \"f54c4ab8ffecf621ab20fb6d2b194af93616cd7e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"50e34d78815e474d410f342fbe783b18192ca518\",\n \"lessThan\": \"16398b4638b5cd8c1dc95fc940a1591a801d53ce\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"50e34d78815e474d410f342fbe783b18192ca518\",\n \"lessThan\": \"a13bd91be22318768d55470cbc0b0f4488ef9edf\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"f28699fafc047ec33299da01e928c3a0073c5cc6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5.18.8\",\n \"lessThan\": \"5.19\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"block/blk-cgroup.c\",\n \"block/blk-core.c\",\n \"block/blk-rq-qos.c\",\n \"block/blk-wbt.c\",\n \"include/linux/blkdev.h\"\n ],\n \"versions\": [\n {\n \"version\": \"5.19\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.19\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.191\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.4.4\",\n \"lessThanOrEqual\": \"6.4.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.5\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/f54c4ab8ffecf621ab20fb6d2b194af93616cd7e","https://git.kernel.org/stable/c/16398b4638b5cd8c1dc95fc940a1591a801d53ce","https://git.kernel.org/stable/c/a13bd91be22318768d55470cbc0b0f4488ef9edf"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-53823","license":"CVE Program Terms of Use","key":"cve-program:CVE-2023-53823","identifiers":["CVE-2023-53823"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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