{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-40329",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-40329"
  ],
  "published": "2025-12-09T04:10:29Z",
  "summary": "drm/sched: Fix deadlock in drm_sched_entity_kill_jobs_cb",
  "details": "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]",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-40329"
    },
    {
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      "url": "https://git.kernel.org/stable/c/70150b9443dddf02157d821c68abf438f55a2e8e"
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      "url": "https://git.kernel.org/stable/c/3e8ada4fd838e3fd2cca94000dac054f3a347c01"
    },
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    "upstream_modified": "2026-05-12T04:54:46Z"
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