CVE-2025-40329 (GCVE-0-2025-40329)

Vulnerability from cvelistv5 – Published: 2025-12-09 04:09 – Updated: 2026-05-11 21:47
VLAI
Title
drm/sched: Fix deadlock in drm_sched_entity_kill_jobs_cb
Summary
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]
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 2fdb8a8f07c2f1353770a324fd19b8114e4329ac , < 70150b9443dddf02157d821c68abf438f55a2e8e (git)
Affected: 2fdb8a8f07c2f1353770a324fd19b8114e4329ac , < 0d63031ee4a57be0252cb9a4e09ae921c75cece9 (git)
Affected: 2fdb8a8f07c2f1353770a324fd19b8114e4329ac , < 3e8ada4fd838e3fd2cca94000dac054f3a347c01 (git)
Affected: 2fdb8a8f07c2f1353770a324fd19b8114e4329ac , < 487df8b698345dd5a91346335f05170ed5f29d4e (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 6.6.117 , ≤ 6.6.* (semver)
Unaffected: 6.12.58 , ≤ 6.12.* (semver)
Unaffected: 6.17.8 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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          "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(\u0026xa-\u003exa_lock#17);\n[ 1231.611038]                                local_irq_disable();\n[ 1231.611039]                                lock(\u0026fence-\u003elock);\n[ 1231.611041]                                lock(\u0026xa-\u003exa_lock#17);\n[ 1231.611044]   \u003cInterrupt\u003e\n[ 1231.611045]     lock(\u0026fence-\u003elock);\n[ 1231.611047]\n                *** DEADLOCK ***\n\nIn this example, CPU0 would be any function accessing job-\u003edependencies\nthrough the xa_* functions that don\u0027t 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  -\u003e drm_sched_entity_kill_jobs_cb()\n  -\u003e foreach dependencies\n     -\u003e 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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        "dateUpdated": "2026-05-11T21:47:15.504Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/0d63031ee4a57be0252cb9a4e09ae921c75cece9"
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          "url": "https://git.kernel.org/stable/c/3e8ada4fd838e3fd2cca94000dac054f3a347c01"
        },
        {
          "url": "https://git.kernel.org/stable/c/487df8b698345dd5a91346335f05170ed5f29d4e"
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      "title": "drm/sched: Fix deadlock in drm_sched_entity_kill_jobs_cb",
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    "cveId": "CVE-2025-40329",
    "datePublished": "2025-12-09T04:09:46.156Z",
    "dateReserved": "2025-04-16T07:20:57.186Z",
    "dateUpdated": "2026-05-11T21:47:15.504Z",
    "state": "PUBLISHED"
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      "id": "msrc_CVE-2025-40329",
      "initial_release_date": "2025-12-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "drm/sched: Fix deadlock in drm_sched_entity_kill_jobs_cb",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-40329.json",
      "version": "2"
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        "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(\u0026xa-\u003exa_lock#17);\n[ 1231.611038]                                local_irq_disable();\n[ 1231.611039]                                lock(\u0026fence-\u003elock);\n[ 1231.611041]                                lock(\u0026xa-\u003exa_lock#17);\n[ 1231.611044]   \u003cInterrupt\u003e\n[ 1231.611045]     lock(\u0026fence-\u003elock);\n[ 1231.611047]\n                *** DEADLOCK ***\n\nIn this example, CPU0 would be any function accessing job-\u003edependencies\nthrough the xa_* functions that don\u0027t 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  -\u003e drm_sched_entity_kill_jobs_cb()\n  -\u003e foreach dependencies\n     -\u003e 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]"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndrm/sched: Se corrige interbloqueo en drm_sched_entity_kill_jobs_cb\n\nEl problema de Mesa referenciado a continuaci\u00f3n se\u00f1al\u00f3 un posible interbloqueo:\n\n[ 1231.611031] Posible escenario de bloqueo inseguro para interrupciones:\n\n[ 1231.611033] CPU0 CPU1\n[ 1231.611034] ---- ----\n[ 1231.611035] lock(\u0026xa -\u003e xa_lock#17);\n[ 1231.611038] local_irq_disable();\n[ 1231.611039] lock(\u0026fence -\u003e lock);\n[ 1231.611041] lock(\u0026xa -\u003e xa_lock#17);\n[ 1231.611044] \u003cInterrupci\u00f3n\u003e\n[ 1231.611045] lock(\u0026fence -\u003e lock);\n[ 1231.611047] * INTERBLOQUEO *\n\nEn este ejemplo, CPU0 ser\u00eda cualquier funci\u00f3n que accede a job -\u003e dependencies a trav\u00e9s de las funciones xa_* que no deshabilitan las interrupciones (ej.: drm_sched_job_add_dependency(), drm_sched_entity_kill_jobs_cb()).\n\nCPU1 est\u00e1 ejecutando drm_sched_entity_kill_jobs_cb() como una devoluci\u00f3n de llamada de se\u00f1alizaci\u00f3n de fence, por lo tanto, en un contexto de interrupci\u00f3n. Se interbloquear\u00e1 al intentar tomar el xa_lock que ya est\u00e1 retenido por CPU0.\n\nReemplazar todo el uso de xa_* por sus contrapartes xa_*_irq solucionar\u00eda este problema, pero Christian se\u00f1al\u00f3 otro problema: dma_fence_signal toma fence.lock y tambi\u00e9n lo hace dma_fence_add_callback.\n\ndma_fence_signal() // bloquea f1.lock\n -\u003e  drm_sched_entity_kill_jobs_cb()\n -\u003e  para cada dependencia\n -\u003e  dma_fence_add_callback() // bloquea f2.lock\n\nEsto se interbloquear\u00e1 si f1 y f2 comparten el mismo spinlock.\n\nPara solucionar ambos problemas, el c\u00f3digo que itera sobre las dependencias y las rearma se traslada a drm_sched_entity_kill_jobs_work().\n\n[phasta: detalles menores del mensaje de commit]"
          }
        ],
        "id": "CVE-2025-40329",
        "lastModified": "2026-10-14T22:10:00.210",
        "metrics": {},
        "published": "2025-12-09T16:17:43.017",
        "references": [
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T02:59:37+00:00",
      "cve": "CVE-2025-40329",
      "id": "CVE-2025-40329",
      "initial_release_date": "2025-12-09T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/sched: Fix deadlock in drm_sched_entity_kill_jobs_cb",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40329.json",
      "version": "3"
    }
  }
}



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