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CVE-2026-68273

Estado: RecibidaAlta (7.8)—

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

drm/amdgpu: Fix context pstate override handling

There are several problems in the context pstate handling code.

The most serious ones are potential use-after-free and NULL pointer dereferences at context initialization time. Both are due amdgpu_ctx_init() not holding the adev->pm.stable_pstate_ctx_lock, which is otherwise used from both sysfs and the context code itself for modifying and clearing the stored context pointer.

Second issue is that context fini can trample over the pstate configuration set via sysfs.

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This is due the restore state (ctx->stable_pstate) being saved at context init time, and not if, or when the context actually changes the pstate. As the context exits it will therefore incorrectly restore to what was set before the sysfs override was requested.

The simplest fix is to drastically simplify how the state is tracked, by clearly defining the points at which pstate ownership is taken and released, and to handle all transitions under the correct lock.

Instead of at context init time, the previous state is saved only at the point the context overrides the current state, and is restored on context exit only if the context is still the owner of the current override state.

(cherry picked from commit 1b5e413713c0a93bc1818394d0ce49aaad21bd27)

CVSS

Probabilidad de explotación (EPSS)

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.

AV:L/PR:L sin UI indica escalada local. Use-after-free y NULL pointer dereferences permiten lectura de memoria (C:H) y DoS (A:H) desde contexto no privilegiado.

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 ProgramFilter Network TrafficExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate 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 KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-68273",
  "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
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "79610d3041338dc1ef554d6fd8b3b3e23be527f5",
              "lessThan": "23a8726e1d7597fe7c9a59d5dc42ba8b7d345b8a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "79610d3041338dc1ef554d6fd8b3b3e23be527f5",
              "lessThan": "e06c39cc1c48dca68a5ffd971c23025a52d46634",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "79610d3041338dc1ef554d6fd8b3b3e23be527f5",
              "lessThan": "9f9c88eb298c54348be3ca4087f4f4c615065b87",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "79610d3041338dc1ef554d6fd8b3b3e23be527f5",
              "lessThan": "c1dc4ccb82c9e56325d8e7514ca4c90bd1efb351",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6607901fce79959130db485e7549dacaaeef034e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6.0.7",
              "lessThan": "6.1",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.1"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.1",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-10T13:20:16.343",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/23a8726e1d7597fe7c9a59d5dc42ba8b7d345b8a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9f9c88eb298c54348be3ca4087f4f4c615065b87",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c1dc4ccb82c9e56325d8e7514ca4c90bd1efb351",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e06c39cc1c48dca68a5ffd971c23025a52d46634",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: Fix context pstate override handling\n\nThere are several problems in the context pstate handling code.\n\nThe most serious ones are potential use-after-free and NULL pointer\ndereferences at context initialization time. Both are due\namdgpu_ctx_init() not holding the adev->pm.stable_pstate_ctx_lock, which\nis otherwise used from both sysfs and the context code itself for\nmodifying and clearing the stored context pointer.\n\nSecond issue is that context fini can trample over the pstate\nconfiguration set via sysfs. This is due the restore state\n(ctx->stable_pstate) being saved at context init time, and not if, or when\nthe context actually changes the pstate. As the context exits it will\ntherefore incorrectly restore to what was set before the sysfs override\nwas requested.\n\nThe simplest fix is to drastically simplify how the state is tracked, by\nclearly defining the points at which pstate ownership is taken and\nreleased, and to handle all transitions under the correct lock.\n\nInstead of at context init time, the previous state is saved only at the\npoint the context overrides the current state, and is restored on context\nexit only if the context is still the owner of the current override state.\n\n(cherry picked from commit 1b5e413713c0a93bc1818394d0ce49aaad21bd27)"
    }
  ],
  "lastModified": "2026-08-17T05:18:29.827",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}