{"id":"CVE-2025-21911","summary":"drm/imagination: avoid deadlock on fence release","details":"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 ***","modified":"2026-05-18T05:59:13.829853479Z","published":"2025-04-01T15:40:49.698Z","related":["SUSE-SU-2025:02254-1","SUSE-SU-2025:02307-1","SUSE-SU-2025:02333-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21911.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/9bd8b8d34cf4efba18766d64f817c819ed1bbde7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d993ae7360923efd6ade43a32043459a121c28c1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/df1a1ed5e1bdd9cc13148e0e5549f5ebcf76cf13"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21911.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21911"},{"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":"eaf01ee5ba28b97f96a3d3eec4c5fbfb37ee4cde"},{"fixed":"d993ae7360923efd6ade43a32043459a121c28c1"},{"fixed":"9bd8b8d34cf4efba18766d64f817c819ed1bbde7"},{"fixed":"df1a1ed5e1bdd9cc13148e0e5549f5ebcf76cf13"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21911.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.8.0"},{"fixed":"6.12.19"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.13.7"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21911.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}