{"id":"CVE-2025-21807","summary":"block: fix queue freeze vs limits lock order in sysfs store methods","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nblock: fix queue freeze vs limits lock order in sysfs store methods\n\nqueue_attr_store() always freezes a device queue before calling the\nattribute store operation. For attributes that control queue limits, the\nstore operation will also lock the queue limits with a call to\nqueue_limits_start_update(). However, some drivers (e.g. SCSI sd) may\nneed to issue commands to a device to obtain limit values from the\nhardware with the queue limits locked. This creates a potential ABBA\ndeadlock situation if a user attempts to modify a limit (thus freezing\nthe device queue) while the device driver starts a revalidation of the\ndevice queue limits.\n\nAvoid such deadlock by not freezing the queue before calling the\n-\u003estore_limit() method in struct queue_sysfs_entry and instead use the\nqueue_limits_commit_update_frozen helper to freeze the queue after taking\nthe limits lock.\n\nThis also removes taking the sysfs lock for the store_limit method as\nit doesn't protect anything here, but creates even more nesting.\nHopefully it will go away from the actual sysfs methods entirely soon.\n\n(commit log adapted from a similar patch from  Damien Le Moal)","modified":"2026-04-02T12:45:14.619445Z","published":"2025-02-27T20:00:59.560Z","related":["CGA-7p7h-jw93-p7mw"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21807.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/8985da5481562e96b95e94ed8e5cc9b6565eb82b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c99f66e4084a62a2cc401c4704a84328aeddc9ec"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21807.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21807"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0327ca9d53bfbb0918867313049bba7046900f73"},{"fixed":"8985da5481562e96b95e94ed8e5cc9b6565eb82b"},{"fixed":"c99f66e4084a62a2cc401c4704a84328aeddc9ec"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21807.json"}}],"schema_version":"1.7.5"}