CVE-2026-74638 (GCVE-0-2026-74638)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-25 05:23
VLAI
Title
drm/v3d: Serialize the scheduler timeout handlers
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/v3d: Serialize the scheduler timeout handlers V3D exposes several independent hardware queues (BIN, RENDER, TFU and CSD) but has only a single, global reset. A timeout on any one queue therefore has to stop, reset and restart the schedulers of every other queue as well. That makes concurrent timeout handlers unsafe. `reset_lock` was never able to make them safe, as a driver-side lock can only cover the driver's &drm_sched_backend_ops.timedout_job callback. The scheduler handles the timed out job and its pending list around that callback, outside of the driver's control, so a global reset triggered by one queue can still interfere with another queue that is in the middle of handling a timeout of its own. Consequently, if a reset happens in the CSD queue while a CL-intensive application is running, the global reset stops and restarts the CL queue's scheduler while that queue is handling a timeout of its own. As drm_sched_stop() and drm_sched_start() subtract and add the credits of every job sitting on the pending list of the scheduler they are called on, and as the CL queue's handler concurrently takes its job off that same list and puts it back, the stop and the start no longer see the same set of jobs. The CL queue is left with more credits in flight than its limit: [ 327.302739] ------------[ cut here ]------------ [ 327.302744] WARNING: CPU: 2 PID: 43 at drivers/gpu/drm/scheduler/sched_main.c:102 drm_sched_run_job_work+0x238/0x4d0 [gpu_sched] [ 327.302884] CPU: 2 UID: 0 PID: 43 Comm: kworker/u16:1 Not tainted 6.18.39-v8-16k+ #3 PREEMPT [ 327.302889] Hardware name: Raspberry Pi 5 Model B Rev 1.0 (DT) [ 327.302893] Workqueue: v3d_bin drm_sched_run_job_work [gpu_sched] [ 327.302984] Call trace: [ 327.302987] drm_sched_run_job_work+0x238/0x4d0 [gpu_sched] (P) [ 327.302997] process_scheduled_works+0x180/0x3d0 [ 327.303010] worker_thread+0x268/0x3e8 [ 327.303016] kthread+0x140/0x250 [ 327.303022] ret_from_fork+0x10/0x20 [ 327.303031] ---[ end trace 0000000000000000 ]--- From that point on, the credit count of the CL queue is broken, causing a complete GPU hang and UI freeze. The DRM scheduler already provides a mechanism to serialize the timeout handlers of different schedulers: an ordered workqueue passed as drm_sched_init()'s @timeout_wq parameter. By default, each scheduler queues its timeout work on the system workqueue, which runs the handlers concurrently. Give all of the queues a shared ordered workqueue instead, as recommended by the DRM scheduler documentation for hardware that has distinct queues but resets globally.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6666 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 35e4079bf1a2570abffce6ababa631afcf8ea0e5 , < 5884851a096d8afcdf91f0e542bac193035183a6 (git)
Affected: 35e4079bf1a2570abffce6ababa631afcf8ea0e5 , < c22a45817b9c92aa0391db60e2ed467c7e6027d7 (git)
Affected: 35e4079bf1a2570abffce6ababa631afcf8ea0e5 , < 4da94744707b27a3ae1197bdd7127da4505dc5b1 (git)
Affected: 5235b56b7e5449d990d21d78723b1a5e7bb5738e (git)
Affected: 12125f7d9c15e6d8ac91d10373b2db2f17dcf767 (git)
Affected: a5f162727b91e480656da1876247a91f651f76de (git)
Affected: 422a8b10ba42097a704d6909ada2956f880246f2 (git)
Affected: 6.1.139 , < 6.2 (semver)
Affected: 6.6.91 , < 6.7 (semver)
Affected: 6.12.29 , < 6.13 (semver)
Affected: 6.14.7 , < 6.15 (semver)
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Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/v3d: Serialize the scheduler timeout handlers\n\nV3D exposes several independent hardware queues (BIN, RENDER, TFU and\nCSD) but has only a single, global reset. A timeout on any one queue\ntherefore has to stop, reset and restart the schedulers of every other\nqueue as well. That makes concurrent timeout handlers unsafe.\n\n`reset_lock` was never able to make them safe, as a driver-side lock can\nonly cover the driver\u0027s \u0026drm_sched_backend_ops.timedout_job callback.\nThe scheduler handles the timed out job and its pending list around that\ncallback, outside of the driver\u0027s control, so a global reset triggered\nby one queue can still interfere with another queue that is in the\nmiddle of handling a timeout of its own.\n\nConsequently, if a reset happens in the CSD queue while a CL-intensive\napplication is running, the global reset stops and restarts the CL\nqueue\u0027s scheduler while that queue is handling a timeout of its own. As\ndrm_sched_stop() and drm_sched_start() subtract and add the credits of\nevery job sitting on the pending list of the scheduler they are called\non, and as the CL queue\u0027s handler concurrently takes its job off that\nsame list and puts it back, the stop and the start no longer see the\nsame set of jobs. The CL queue is left with more credits in flight than\nits limit:\n\n[  327.302739] ------------[ cut here ]------------\n[  327.302744] WARNING: CPU: 2 PID: 43 at drivers/gpu/drm/scheduler/sched_main.c:102 drm_sched_run_job_work+0x238/0x4d0 [gpu_sched]\n[  327.302884] CPU: 2 UID: 0 PID: 43 Comm: kworker/u16:1 Not tainted 6.18.39-v8-16k+ #3 PREEMPT\n[  327.302889] Hardware name: Raspberry Pi 5 Model B Rev 1.0 (DT)\n[  327.302893] Workqueue: v3d_bin drm_sched_run_job_work [gpu_sched]\n[  327.302984] Call trace:\n[  327.302987]  drm_sched_run_job_work+0x238/0x4d0 [gpu_sched] (P)\n[  327.302997]  process_scheduled_works+0x180/0x3d0\n[  327.303010]  worker_thread+0x268/0x3e8\n[  327.303016]  kthread+0x140/0x250\n[  327.303022]  ret_from_fork+0x10/0x20\n[  327.303031] ---[ end trace 0000000000000000 ]---\n\nFrom that point on, the credit count of the CL queue is broken, causing\na complete GPU hang and UI freeze.\n\nThe DRM scheduler already provides a mechanism to serialize the timeout\nhandlers of different schedulers: an ordered workqueue passed as\ndrm_sched_init()\u0027s @timeout_wq parameter. By default, each scheduler\nqueues its timeout work on the system workqueue, which runs the handlers\nconcurrently. Give all of the queues a shared ordered workqueue instead,\nas recommended by the DRM scheduler documentation for hardware that has\ndistinct queues but resets globally."
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    "dateReserved": "2026-08-15T05:44:03.922Z",
    "dateUpdated": "2026-08-25T05:23:13.123Z",
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/v3d: Serialize the scheduler timeout handlers\n\nV3D exposes several independent hardware queues (BIN, RENDER, TFU and\nCSD) but has only a single, global reset. A timeout on any one queue\ntherefore has to stop, reset and restart the schedulers of every other\nqueue as well. That makes concurrent timeout handlers unsafe.\n\n`reset_lock` was never able to make them safe, as a driver-side lock can\nonly cover the driver\u0027s \u0026drm_sched_backend_ops.timedout_job callback.\nThe scheduler handles the timed out job and its pending list around that\ncallback, outside of the driver\u0027s control, so a global reset triggered\nby one queue can still interfere with another queue that is in the\nmiddle of handling a timeout of its own.\n\nConsequently, if a reset happens in the CSD queue while a CL-intensive\napplication is running, the global reset stops and restarts the CL\nqueue\u0027s scheduler while that queue is handling a timeout of its own. As\ndrm_sched_stop() and drm_sched_start() subtract and add the credits of\nevery job sitting on the pending list of the scheduler they are called\non, and as the CL queue\u0027s handler concurrently takes its job off that\nsame list and puts it back, the stop and the start no longer see the\nsame set of jobs. The CL queue is left with more credits in flight than\nits limit:\n\n[  327.302739] ------------[ cut here ]------------\n[  327.302744] WARNING: CPU: 2 PID: 43 at drivers/gpu/drm/scheduler/sched_main.c:102 drm_sched_run_job_work+0x238/0x4d0 [gpu_sched]\n[  327.302884] CPU: 2 UID: 0 PID: 43 Comm: kworker/u16:1 Not tainted 6.18.39-v8-16k+ #3 PREEMPT\n[  327.302889] Hardware name: Raspberry Pi 5 Model B Rev 1.0 (DT)\n[  327.302893] Workqueue: v3d_bin drm_sched_run_job_work [gpu_sched]\n[  327.302984] Call trace:\n[  327.302987]  drm_sched_run_job_work+0x238/0x4d0 [gpu_sched] (P)\n[  327.302997]  process_scheduled_works+0x180/0x3d0\n[  327.303010]  worker_thread+0x268/0x3e8\n[  327.303016]  kthread+0x140/0x250\n[  327.303022]  ret_from_fork+0x10/0x20\n[  327.303031] ---[ end trace 0000000000000000 ]---\n\nFrom that point on, the credit count of the CL queue is broken, causing\na complete GPU hang and UI freeze.\n\nThe DRM scheduler already provides a mechanism to serialize the timeout\nhandlers of different schedulers: an ordered workqueue passed as\ndrm_sched_init()\u0027s @timeout_wq parameter. By default, each scheduler\nqueues its timeout work on the system workqueue, which runs the handlers\nconcurrently. Give all of the queues a shared ordered workqueue instead,\nas recommended by the DRM scheduler documentation for hardware that has\ndistinct queues but resets globally."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndrm/v3d: Serializar los gestores de tiempo de espera del planificador\n\nV3D expone varias colas de hardware independientes (BIN, RENDER, TFU y CSD) pero tiene solo un reinicio \u00fanico y global. Un tiempo de espera en cualquier cola, por lo tanto, tiene que detener, reiniciar y volver a iniciar los planificadores de todas las dem\u00e1s colas tambi\u00e9n. Eso hace que los gestores de tiempo de espera concurrentes sean inseguros.\n\n\u0027reset_lock\u0027 nunca pudo hacerlos seguros, ya que un bloqueo del lado del controlador solo puede cubrir la llamada de retorno \u0026drm_sched_backend_ops.timedout_job del controlador. El planificador maneja el trabajo con tiempo de espera agotado y su lista de pendientes alrededor de esa llamada de retorno, fuera del control del controlador, por lo que un reinicio global activado por una cola a\u00fan puede interferir con otra cola que est\u00e1 en medio de manejar un tiempo de espera propio.\n\nEn consecuencia, si ocurre un reinicio en la cola CSD mientras se ejecuta una aplicaci\u00f3n intensiva en CL, el reinicio global detiene y reinicia el planificador de la cola CL mientras esa cola est\u00e1 manejando un tiempo de espera propio. Como drm_sched_stop() y drm_sched_start() restan y suman los cr\u00e9ditos de cada trabajo que se encuentra en la lista de pendientes del planificador en el que se les llama, y como el gestor de la cola CL retira concurrentemente su trabajo de esa misma lista y lo vuelve a colocar, la detenci\u00f3n y el inicio ya no ven el mismo conjunto de trabajos. La cola CL se queda con m\u00e1s cr\u00e9ditos en curso que su l\u00edmite:\n\n[  327.302739] ------------[ cut here ]------------\n[  327.302744] WARNING: CPU: 2 PID: 43 at drivers/gpu/drm/scheduler/sched_main.c:102 drm_sched_run_job_work+0x238/0x4d0 [gpu_sched]\n[  327.302884] CPU: 2 UID: 0 PID: 43 Comm: kworker/u16:1 Not tainted 6.18.39-v8-16k+ #3 PREEMPT\n[  327.302889] Hardware name: Raspberry Pi 5 Model B Rev 1.0 (DT)\n[  327.302893] Workqueue: v3d_bin drm_sched_run_job_work [gpu_sched]\n[  327.302984] Call trace:\n[  327.302987]  drm_sched_run_job_work+0x238/0x4d0 [gpu_sched] (P)\n[  327.302997]  process_scheduled_works+0x180/0x3d0\n[  327.303010]  worker_thread+0x268/0x3e8\n[  327.303016]  kthread+0x140/0x250\n[  327.303022]  ret_from_fork+0x10/0x20\n[  327.303031] ---[ end trace 0000000000000000 ]---\n\nA partir de ese momento, el recuento de cr\u00e9ditos de la cola CL est\u00e1 roto, causando un cuelgue completo de la GPU y un congelamiento de la interfaz de usuario.\n\nEl planificador DRM ya proporciona un mecanismo para serializar los gestores de tiempo de espera de diferentes planificadores: una cola de trabajo ordenada pasada como el par\u00e1metro @timeout_wq de drm_sched_init(). Por defecto, cada planificador encola su trabajo de tiempo de espera en la cola de trabajo del sistema, que ejecuta los gestores concurrentemente. En su lugar, d\u00e9 a todas las colas una cola de trabajo ordenada compartida, como recomienda la documentaci\u00f3n del planificador DRM para hardware que tiene colas distintas pero se reinicia globalmente."
          }
        ],
        "id": "CVE-2026-74638",
        "lastModified": "2026-10-14T13:10:00.187",
        "metrics": {},
        "published": "2026-08-22T16:16:37.007",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/4da94744707b27a3ae1197bdd7127da4505dc5b1"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5884851a096d8afcdf91f0e542bac193035183a6"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c22a45817b9c92aa0391db60e2ed467c7e6027d7"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-24T09:07:36+00:00",
      "cve": "CVE-2026-74638",
      "id": "CVE-2026-74638",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/v3d: Serialize the scheduler timeout handlers",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74638.json",
      "version": "3"
    }
  }
}



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