{"id":"CVE-2025-40329","state":"PUBLISHED","title":"drm/sched: Fix deadlock in drm_sched_entity_kill_jobs_cb","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/sched: Fix deadlock in drm_sched_entity_kill_jobs_cb\n\nThe Mesa issue referenced below pointed out a possible deadlock:\n\n[ 1231.611031]  Possible interrupt unsafe locking scenario:\n\n[ 1231.611033]        CPU0                    CPU1\n[ 1231.611034]        ----                    ----\n[ 1231.611035]   lock(&xa->xa_lock#17);\n[ 1231.611038]                                local_irq_disable();\n[ 1231.611039]                                lock(&fence->lock);\n[ 1231.611041]                                lock(&xa->xa_lock#17);\n[ 1231.611044]   <Interrupt>\n[ 1231.611045]     lock(&fence->lock);\n[ 1231.611047]\n                *** DEADLOCK ***\n\nIn this example, CPU0 would be any function accessing job->dependencies\nthrough the xa_* functions that don't disable interrupts (eg:\ndrm_sched_job_add_dependency(), drm_sched_entity_kill_jobs_cb()).\n\nCPU1 is executing drm_sched_entity_kill_jobs_cb() as a fence signalling\ncallback so in an interrupt context. It will deadlock when trying to\ngrab the xa_lock which is already held by CPU0.\n\nReplacing all xa_* usage by their xa_*_irq counterparts would fix\nthis issue, but Christian pointed out another issue: dma_fence_signal\ntakes fence.lock and so does dma_fence_add_callback.\n\n  dma_fence_signal() // locks f1.lock\n  -> drm_sched_entity_kill_jobs_cb()\n  -> foreach dependencies\n     -> dma_fence_add_callback() // locks f2.lock\n\nThis will deadlock if f1 and f2 share the same spinlock.\n\nTo fix both issues, the code iterating on dependencies and re-arming them\nis moved out to drm_sched_entity_kill_jobs_work().\n\n[phasta: commit message nits]","publishedAt":"2025-12-09T04:09:46.156Z","updatedAt":"2026-05-11T21:47:15.504Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2fdb8a8f07c2f1353770a324fd19b8114e4329ac","status":"affected","lessThan":"70150b9443dddf02157d821c68abf438f55a2e8e","versionType":"git"},{"version":"2fdb8a8f07c2f1353770a324fd19b8114e4329ac","status":"affected","lessThan":"0d63031ee4a57be0252cb9a4e09ae921c75cece9","versionType":"git"},{"version":"2fdb8a8f07c2f1353770a324fd19b8114e4329ac","status":"affected","lessThan":"3e8ada4fd838e3fd2cca94000dac054f3a347c01","versionType":"git"},{"version":"2fdb8a8f07c2f1353770a324fd19b8114e4329ac","status":"affected","lessThan":"487df8b698345dd5a91346335f05170ed5f29d4e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/scheduler/sched_entity.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.2","versionType":"semver"},{"version":"6.6.117","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.58","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.8","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","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/scheduler/sched_entity.c"]}],"references":["https://git.kernel.org/stable/c/70150b9443dddf02157d821c68abf438f55a2e8e","https://git.kernel.org/stable/c/0d63031ee4a57be0252cb9a4e09ae921c75cece9","https://git.kernel.org/stable/c/3e8ada4fd838e3fd2cca94000dac054f3a347c01","https://git.kernel.org/stable/c/487df8b698345dd5a91346335f05170ed5f29d4e"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:09.358Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/40xxx/CVE-2025-40329.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-40329","state":"PUBLISHED","datePublished":"2025-12-09T04:09:46.156Z","dateUpdated":"2026-05-11T21:47:15.504Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T07:20:57.186Z"},"containers":{"cna":{"title":"drm/sched: Fix deadlock in drm_sched_entity_kill_jobs_cb","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/sched: Fix deadlock in drm_sched_entity_kill_jobs_cb\n\nThe Mesa issue referenced below pointed out a possible deadlock:\n\n[ 1231.611031]  Possible interrupt unsafe locking scenario:\n\n[ 1231.611033]        CPU0                    CPU1\n[ 1231.611034]        ----                    ----\n[ 1231.611035]   lock(&xa->xa_lock#17);\n[ 1231.611038]                                local_irq_disable();\n[ 1231.611039]                                lock(&fence->lock);\n[ 1231.611041]                                lock(&xa->xa_lock#17);\n[ 1231.611044]   <Interrupt>\n[ 1231.611045]     lock(&fence->lock);\n[ 1231.611047]\n                *** DEADLOCK ***\n\nIn this example, CPU0 would be any function accessing job->dependencies\nthrough the xa_* functions that don't disable interrupts (eg:\ndrm_sched_job_add_dependency(), drm_sched_entity_kill_jobs_cb()).\n\nCPU1 is executing drm_sched_entity_kill_jobs_cb() as a fence signalling\ncallback so in an interrupt context. It will deadlock when trying to\ngrab the xa_lock which is already held by CPU0.\n\nReplacing all xa_* usage by their xa_*_irq counterparts would fix\nthis issue, but Christian pointed out another issue: dma_fence_signal\ntakes fence.lock and so does dma_fence_add_callback.\n\n  dma_fence_signal() // locks f1.lock\n  -> drm_sched_entity_kill_jobs_cb()\n  -> foreach dependencies\n     -> dma_fence_add_callback() // locks f2.lock\n\nThis will deadlock if f1 and f2 share the same spinlock.\n\nTo fix both issues, the code iterating on dependencies and re-arming them\nis moved out to drm_sched_entity_kill_jobs_work().\n\n[phasta: commit message nits]"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2fdb8a8f07c2f1353770a324fd19b8114e4329ac","status":"affected","lessThan":"70150b9443dddf02157d821c68abf438f55a2e8e","versionType":"git"},{"version":"2fdb8a8f07c2f1353770a324fd19b8114e4329ac","status":"affected","lessThan":"0d63031ee4a57be0252cb9a4e09ae921c75cece9","versionType":"git"},{"version":"2fdb8a8f07c2f1353770a324fd19b8114e4329ac","status":"affected","lessThan":"3e8ada4fd838e3fd2cca94000dac054f3a347c01","versionType":"git"},{"version":"2fdb8a8f07c2f1353770a324fd19b8114e4329ac","status":"affected","lessThan":"487df8b698345dd5a91346335f05170ed5f29d4e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/scheduler/sched_entity.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.2","versionType":"semver"},{"version":"6.6.117","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.58","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.8","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","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/scheduler/sched_entity.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/70150b9443dddf02157d821c68abf438f55a2e8e"},{"url":"https://git.kernel.org/stable/c/0d63031ee4a57be0252cb9a4e09ae921c75cece9"},{"url":"https://git.kernel.org/stable/c/3e8ada4fd838e3fd2cca94000dac054f3a347c01"},{"url":"https://git.kernel.org/stable/c/487df8b698345dd5a91346335f05170ed5f29d4e"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:47:15.504Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.6.117"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.12.58"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.17.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.18"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}