{"id":"DEBIAN-CVE-2025-21911","details":"In the Linux kernel, the following vulnerability has been resolved:  drm/imagination: avoid deadlock on fence release  Do scheduler queue fence release processing on a workqueue, rather than in the release function itself.  Fixes deadlock issues such as the following:  [  607.400437] ============================================ [  607.405755] WARNING: possible recursive locking detected [  607.415500] -------------------------------------------- [  607.420817] weston:zfq0/24149 is trying to acquire lock: [  607.426131] ffff000017d041a0 (reservation_ww_class_mutex){+.+.}-{3:3}, at: pvr_gem_object_vunmap+0x40/0xc0 [powervr] [  607.436728]                but task is already holding lock: [  607.442554] ffff000017d105a0 (reservation_ww_class_mutex){+.+.}-{3:3}, at: dma_buf_ioctl+0x250/0x554 [  607.451727]                other info that might help us debug this: [  607.458245]  Possible unsafe locking scenario:  [  607.464155]        CPU0 [  607.466601]        ---- [  607.469044]   lock(reservation_ww_class_mutex); [  607.473584]   lock(reservation_ww_class_mutex); [  607.478114]                 *** DEADLOCK ***","modified":"2026-08-27T23:05:12.281407984Z","published":"2025-04-01T16:15:21.677Z","upstream":["CVE-2025-21911"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2025-21911"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.19-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-21911.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.19-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-21911.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}