CVE-2025-40329 - Vulnerability Details

Vendors	Products
Linux	Linux Kernel

Link	Providers
https://git.kernel.org/stable/c/0d63031ee4a57be0252cb9a4e09ae921c75cece9
https://git.kernel.org/stable/c/3e8ada4fd838e3fd2cca94000dac054f3a347c01
https://git.kernel.org/stable/c/487df8b698345dd5a91346335f05170ed5f29d4e
https://git.kernel.org/stable/c/70150b9443dddf02157d821c68abf438f55a2e8e

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: drm/sched: Fix deadlock in drm_sched_entity_kill_jobs_cb The Mesa issue referenced below pointed out a possible deadlock: [ 1231.611031] Possible interrupt unsafe locking scenario: [ 1231.611033] CPU0 CPU1 [ 1231.611034] ---- ---- [ 1231.611035] lock(&xa->xa_lock#17); [ 1231.611038] local_irq_disable(); [ 1231.611039] lock(&fence->lock); [ 1231.611041] lock(&xa->xa_lock#17); [ 1231.611044] <Interrupt> [ 1231.611045] lock(&fence->lock); [ 1231.611047] * DEADLOCK * In this example, CPU0 would be any function accessing job->dependencies through the xa_* functions that don't disable interrupts (eg: drm_sched_job_add_dependency(), drm_sched_entity_kill_jobs_cb()). CPU1 is executing drm_sched_entity_kill_jobs_cb() as a fence signalling callback so in an interrupt context. It will deadlock when trying to grab the xa_lock which is already held by CPU0. Replacing all xa_* usage by their xa_*_irq counterparts would fix this issue, but Christian pointed out another issue: dma_fence_signal takes fence.lock and so does dma_fence_add_callback. dma_fence_signal() // locks f1.lock -> drm_sched_entity_kill_jobs_cb() -> foreach dependencies -> dma_fence_add_callback() // locks f2.lock This will deadlock if f1 and f2 share the same spinlock. To fix both issues, the code iterating on dependencies and re-arming them is moved out to drm_sched_entity_kill_jobs_work(). [phasta: commit message nits]
Title		drm/sched: Fix deadlock in drm_sched_entity_kill_jobs_cb
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/0d63031ee4a57be0252cb9a4e09ae921c75cece9 https://git.kernel.org/stable/c/3e8ada4fd838e3fd2cca94000dac054f3a347c01 https://git.kernel.org/stable/c/487df8b698345dd5a91346335f05170ed5f29d4e https://git.kernel.org/stable/c/70150b9443dddf02157d821c68abf438f55a2e8e

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-40329", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.186Z", "datePublished": "2025-12-09T04:09:46.156Z", "dateUpdated": "2025-12-09T04:09:46.156Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-12-09T04:09:46.156Z"}, "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": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/gpu/drm/scheduler/sched_entity.c"], "versions": [{"version": "2fdb8a8f07c2f1353770a324fd19b8114e4329ac", "lessThan": "70150b9443dddf02157d821c68abf438f55a2e8e", "status": "affected", "versionType": "git"}, {"version": "2fdb8a8f07c2f1353770a324fd19b8114e4329ac", "lessThan": "0d63031ee4a57be0252cb9a4e09ae921c75cece9", "status": "affected", "versionType": "git"}, {"version": "2fdb8a8f07c2f1353770a324fd19b8114e4329ac", "lessThan": "3e8ada4fd838e3fd2cca94000dac054f3a347c01", "status": "affected", "versionType": "git"}, {"version": "2fdb8a8f07c2f1353770a324fd19b8114e4329ac", "lessThan": "487df8b698345dd5a91346335f05170ed5f29d4e", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/gpu/drm/scheduler/sched_entity.c"], "versions": [{"version": "6.2", "status": "affected"}, {"version": "0", "lessThan": "6.2", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.117", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.58", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17.8", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "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"}]}]}], "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"}], "title": "drm/sched: Fix deadlock in drm_sched_entity_kill_jobs_cb", "x_generator": {"engine": "bippy-1.2.0"}}}}

{"cveTags": [], "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]"}], "id": "CVE-2025-40329", "lastModified": "2025-12-09T18:36:53.557", "metrics": {}, "published": "2025-12-09T16:17:43.017", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0d63031ee4a57be0252cb9a4e09ae921c75cece9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3e8ada4fd838e3fd2cca94000dac054f3a347c01"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/487df8b698345dd5a91346335f05170ed5f29d4e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/70150b9443dddf02157d821c68abf438f55a2e8e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

Metrics

Affected Vendors & Products

Metrics

Affected Vendors & Products

JSON object

JSON object

JSON object

JSON object