CVE-2025-40329 (GCVE-0-2025-40329)
Vulnerability from cvelistv5
Published
2025-12-09 04:09
Modified
2025-12-09 04:09
Severity ?
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]
References
Impacted products
Vendor Product Version
Linux Linux Version: 2fdb8a8f07c2f1353770a324fd19b8114e4329ac
Version: 2fdb8a8f07c2f1353770a324fd19b8114e4329ac
Version: 2fdb8a8f07c2f1353770a324fd19b8114e4329ac
Version: 2fdb8a8f07c2f1353770a324fd19b8114e4329ac
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/scheduler/sched_entity.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
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              "lessThan": "0d63031ee4a57be0252cb9a4e09ae921c75cece9",
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        {
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "6.2"
            },
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              "lessThan": "6.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.117",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.58",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.117",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.58",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
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                  "versionEndExcluding": "6.17.8",
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                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-09T04:09:46.156Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40329",
    "datePublished": "2025-12-09T04:09:46.156Z",
    "dateReserved": "2025-04-16T07:20:57.186Z",
    "dateUpdated": "2025-12-09T04:09:46.156Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40329\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-09T16:17:43.017\",\"lastModified\":\"2025-12-09T18:36:53.557\",\"vulnStatus\":\"Awaiting Analysis\",\"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(\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]\"}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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