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CVE-2026-90383

Estado: RecibidaAlta (7.8)—

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

misc: sgi-gru: remove interrupt-context page-table walks

The GRU TLB miss handler walks a process's page tables without holding page-table locks or a reference to the mapped page. It also uses a kernel page-table accessor on user page tables and supports only PMD-level large mappings on x86-64.

Remove the direct walker. Send interrupt faults directly to user polling mode so the existing call-OS fallback retries them in process context.

Remove the mmap-lock failure statistic that can no longer be incremented.

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.

Vulnerabilidad de acceso local en kernel Linux (AV:L/PR:L) que permite escalada de privilegios mediante manipulación de tablas de páginas sin sincronización. El impacto de ejecución de código y control total del sistema (C:H/I:H/A:H) sugiere ejecución privilegiada.

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

Execution PreventionUpdate SoftwareUser Account ManagementThreat Intelligence ProgramRestrict File and Directory PermissionsPrivileged Account Management

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-2026-90383",
  "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": "142586409c8be7dc071bb94d7cd2d69ccfd99b6b",
              "lessThan": "877423f595b60f8fe7c18b64a5d283d9e1732a13",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "142586409c8be7dc071bb94d7cd2d69ccfd99b6b",
              "lessThan": "6248eb1833ff0adfdbbadd5f846c2f22e02a01b0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "142586409c8be7dc071bb94d7cd2d69ccfd99b6b",
              "lessThan": "ef81e4a1628ecfb9cfc442de10883f383faf17a1",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "142586409c8be7dc071bb94d7cd2d69ccfd99b6b",
              "lessThan": "928a8e9f523df845fc496bcb9811013b67aabec5",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/misc/sgi-gru/grufault.c",
            "drivers/misc/sgi-gru/gruprocfs.c",
            "drivers/misc/sgi-gru/grutables.h"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.27"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "2.6.27",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/misc/sgi-gru/grufault.c",
            "drivers/misc/sgi-gru/gruprocfs.c",
            "drivers/misc/sgi-gru/grutables.h"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-17T17:17:37.660",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/6248eb1833ff0adfdbbadd5f846c2f22e02a01b0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/877423f595b60f8fe7c18b64a5d283d9e1732a13",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/928a8e9f523df845fc496bcb9811013b67aabec5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ef81e4a1628ecfb9cfc442de10883f383faf17a1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: sgi-gru: remove interrupt-context page-table walks\n\nThe GRU TLB miss handler walks a process's page tables without holding\npage-table locks or a reference to the mapped page. It also uses a kernel\npage-table accessor on user page tables and supports only PMD-level large\nmappings on x86-64.\n\nRemove the direct walker. Send interrupt faults directly to user polling\nmode so the existing call-OS fallback retries them in process context.\n\nRemove the mmap-lock failure statistic that can no longer be incremented."
    }
  ],
  "lastModified": "2026-09-18T18:17:56.450",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}