{"id":"CVE-2025-21911","state":"PUBLISHED","title":"drm/imagination: avoid deadlock on fence release","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 ***","publishedAt":"2025-04-01T15:40:49.698Z","updatedAt":"2026-05-11T21:08:54.809Z","severity":{"score":5.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"eaf01ee5ba28b97f96a3d3eec4c5fbfb37ee4cde","status":"affected","lessThan":"d993ae7360923efd6ade43a32043459a121c28c1","versionType":"git"},{"version":"eaf01ee5ba28b97f96a3d3eec4c5fbfb37ee4cde","status":"affected","lessThan":"9bd8b8d34cf4efba18766d64f817c819ed1bbde7","versionType":"git"},{"version":"eaf01ee5ba28b97f96a3d3eec4c5fbfb37ee4cde","status":"affected","lessThan":"df1a1ed5e1bdd9cc13148e0e5549f5ebcf76cf13","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/imagination/pvr_queue.c","drivers/gpu/drm/imagination/pvr_queue.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.8","versionType":"semver"},{"version":"6.12.19","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.13.7","status":"unaffected","lessThanOrEqual":"6.13.*","versionType":"semver"},{"version":"6.14","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/imagination/pvr_queue.c","drivers/gpu/drm/imagination/pvr_queue.h"]}],"references":["https://git.kernel.org/stable/c/d993ae7360923efd6ade43a32043459a121c28c1","https://git.kernel.org/stable/c/9bd8b8d34cf4efba18766d64f817c819ed1bbde7","https://git.kernel.org/stable/c/df1a1ed5e1bdd9cc13148e0e5549f5ebcf76cf13"],"weaknesses":["CWE-667"],"ingestedAt":"2026-10-29T20:08:39.238Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/21xxx/CVE-2025-21911.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-21911","state":"PUBLISHED","datePublished":"2025-04-01T15:40:49.698Z","dateUpdated":"2026-05-11T21:08:54.809Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-12-29T08:45:45.787Z"},"containers":{"cna":{"title":"drm/imagination: avoid deadlock on fence release","descriptions":[{"lang":"en","value":"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 ***"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"eaf01ee5ba28b97f96a3d3eec4c5fbfb37ee4cde","status":"affected","lessThan":"d993ae7360923efd6ade43a32043459a121c28c1","versionType":"git"},{"version":"eaf01ee5ba28b97f96a3d3eec4c5fbfb37ee4cde","status":"affected","lessThan":"9bd8b8d34cf4efba18766d64f817c819ed1bbde7","versionType":"git"},{"version":"eaf01ee5ba28b97f96a3d3eec4c5fbfb37ee4cde","status":"affected","lessThan":"df1a1ed5e1bdd9cc13148e0e5549f5ebcf76cf13","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/imagination/pvr_queue.c","drivers/gpu/drm/imagination/pvr_queue.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.8","versionType":"semver"},{"version":"6.12.19","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.13.7","status":"unaffected","lessThanOrEqual":"6.13.*","versionType":"semver"},{"version":"6.14","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/imagination/pvr_queue.c","drivers/gpu/drm/imagination/pvr_queue.h"]}],"references":[{"url":"https://git.kernel.org/stable/c/d993ae7360923efd6ade43a32043459a121c28c1"},{"url":"https://git.kernel.org/stable/c/9bd8b8d34cf4efba18766d64f817c819ed1bbde7"},{"url":"https://git.kernel.org/stable/c/df1a1ed5e1bdd9cc13148e0e5549f5ebcf76cf13"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:08:54.809Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"6.12.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"6.13.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"6.14"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.5,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"id":"CVE-2025-21911","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2025-10-01T19:24:14.752243Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-667","lang":"en","type":"CWE","description":"CWE-667 Improper Locking"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-10-01T19:26:34.387Z"}}]}}}