CVE-2026-74453

Estado: RecibidaAlta (7.8)—

In the Linux kernel, the following vulnerability has been resolved:

drm/vc4: Zero the tile state data array before each BIN job

The binner BO is a single 16MB buffer split into 512KB slots that are handed out to jobs at submission time and recycled as jobs complete, without ever being cleared. Each slot holds the job's Tile State Data Array (TSDA) at its start, followed by the tile allocation pool.

While the tile allocation pool is only walked by the render thread through branches the binner generated during the current job, the TSDA is the PTB's own per-tile bookkeeping and is consumed by the hardware itself.

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Although the kernel sets the "Auto-initialise Tile State Data Array" flag in the tile binning mode configuration, the PTB demonstrably still acts on stale tile state left by the slot's previous user: the binner ends up creating invalid command streams with invalid primitive streams and branches, which can cause GPU hangs as observed in [1][2].

Zero the TSDA when the job's binning slot is configured. This clears 48 bytes per tile (~24KB for a 1080p frame) in the submission path, and guarantees the PTB never sees another job's tile state.

The tile count is only checked for being non-zero today, so the 8-bit fields it comes from can describe a tile state array almost six times larger than the slot it has to live in. Bound it before the slot is handed out, since such size decides how much of the slot is left for the tile alloc pool.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.18%
Percentil entre todas las CVEs puntuadas: 6
Fecha de la puntuación: 5/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Impacto principalT1499.004 Application or System Exploitationimpact75 %

Acceso local (AV:L) sin interacción del usuario permite escalar privilegios manipulando estado del GPU; el fallo causa GPU hangs que constituyen DoS local.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence Program Filter Network Traffic Execution Prevention Application Isolation and Sandboxing Exploit Protection Update Software

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux Kernel^AI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-74453",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
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          "programFiles": [
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          "defaultStatus": "affected"
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  ],
  "published": "2026-08-15T13:17:49.893",
  "references": [
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      "url": "https://git.kernel.org/stable/c/0e858422df2334165293ea742da9fbb2e51f2739",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vc4: Zero the tile state data array before each BIN job\n\nThe binner BO is a single 16MB buffer split into 512KB slots that are\nhanded out to jobs at submission time and recycled as jobs complete,\nwithout ever being cleared. Each slot holds the job's Tile State Data\nArray (TSDA) at its start, followed by the tile allocation pool.\n\nWhile the tile allocation pool is only walked by the render thread\nthrough branches the binner generated during the current job, the\nTSDA is the PTB's own per-tile bookkeeping and is consumed by the\nhardware itself. Although the kernel sets the \"Auto-initialise Tile\nState Data Array\" flag in the tile binning mode configuration, the\nPTB demonstrably still acts on stale tile state left by the slot's\nprevious user: the binner ends up creating invalid command streams\nwith invalid primitive streams and branches, which can cause GPU hangs\nas observed in [1][2].\n\nZero the TSDA when the job's binning slot is configured. This clears\n48 bytes per tile (~24KB for a 1080p frame) in the submission path, and\nguarantees the PTB never sees another job's tile state.\n\nThe tile count is only checked for being non-zero today, so the 8-bit\nfields it comes from can describe a tile state array almost six times\nlarger than the slot it has to live in. Bound it before the slot is\nhanded out, since such size decides how much of the slot is left for\nthe tile alloc pool."
    }
  ],
  "lastModified": "2026-08-19T17:21:01.953",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}