{"cve":"CVE-2025-21911","nvd":{"published":"2025-04-01T16:15:21.677","modified":"2026-06-17T08:44:35.430","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/imagination: avoid deadlock on fence release\n\nDo scheduler queue fence release processing on a workqueue, rather\nthan in the release function itself.\n\nFixes deadlock issues such as the following:\n\n[  607.400437] ============================================\n[  607.405755] WARNING: possible recursive locking detected\n[  607.415500] --------------------------------------------\n[  607.420817] weston:zfq0/24149 is trying to acquire lock:\n[  607.426131] ffff000017d041a0 (reservation_ww_class_mutex){+.+.}-{3:3}, at: pvr_gem_object_vunmap+0x40/0xc0 [powervr]\n[  607.436728]\n               but task is already holding lock:\n[  607.442554] ffff000017d105a0 (reservation_ww_class_mutex){+.+.}-{3:3}, at: dma_buf_ioctl+0x250/0x554\n[  607.451727]\n               other info that might help us debug this:\n[  607.458245]  Possible unsafe locking scenario:\n\n[  607.464155]        CPU0\n[  607.466601]        ----\n[  607.469044]   lock(reservation_ww_class_mutex);\n[  607.473584]   lock(reservation_ww_class_mutex);\n[  607.478114]\n                *** DEADLOCK ***","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/9bd8b8d34cf4efba18766d64f817c819ed1bbde7","https://git.kernel.org/stable/c/d993ae7360923efd6ade43a32043459a121c28c1","https://git.kernel.org/stable/c/df1a1ed5e1bdd9cc13148e0e5549f5ebcf76cf13"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:00:57.946988208+00:00"},"epss":{"cve":"CVE-2025-21911","score":0.00155,"percentile":0.04626,"date":"2026-11-01"},"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."]}