{"cve":"CVE-2025-21807","nvd":{"published":"2025-02-27T20:16:03.317","modified":"2026-07-18T16:17:11.690","status":"Modified","description":"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->store_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)","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-667"],"references":["https://git.kernel.org/stable/c/1645cd7fd42c236c952e9228badcac4fea1829ea","https://git.kernel.org/stable/c/8985da5481562e96b95e94ed8e5cc9b6565eb82b","https://git.kernel.org/stable/c/c99f66e4084a62a2cc401c4704a84328aeddc9ec"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:59:48.811064707+00:00"},"epss":{"cve":"CVE-2025-21807","score":0.0015,"percentile":0.04114,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}