CVE-2026-81016

Estado: RecibidaAlta (7.7)—

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

platform/x86/amd/pmc: Propagate SMU errors and validate S2D address

amd_stb_s2d_init() discards the return value of several S2D SMU commands. When the SMU refuses a command (e.g. "SMU cmd failed. err: 0xff") the failure is only noticed indirectly - if at all - and reported as -EIO, masking the real error.

More seriously, the S2D_PHYS_ADDR_LOW/HIGH return values are ignored, so on failure phys_addr_low/hi are left uninitialised and the assembled address is passed straight to devm_ioremap(). When the SMU leaves them at zero this maps physical address 0 and trips the ioremap-on-RAM warning:

Leer descripción completaMostrar menos

Check the return value of each SMU command and propagate it, and reject a zero physical address before calling devm_ioremap().

Detalles técnicos trazas, registros y código del informe original

  amd_pmc AMDI000B:00: SMU cmd failed. err: 0xff
  ioremap on RAM at 0x0000000000000000 - 0x0000000000ffffff
  WARNING: CPU: 13 PID: 4592 at arch/x86/mm/ioremap.c:...

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Puntuación base: 7.7

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.19%
Percentil entre todas las CVEs puntuadas: 8
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 escalation90 %
Impacto principalT1499.004 Application or System Exploitationimpact75 %
Impacto secundarioT1005 Data from Local Systemcollection60 %

Acceso local sin interacción en kernel Linux (AV:L/PR:N/UI:N) permite escalada; fallo de validación SMU causa DoS (denial of availability) o lectura de memoria no inicializada.

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-2026-81016",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.7,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.2,
        "exploitabilityScore": 2.5
      }
    ]
  },
  "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": "3d7d407dfb05b257e15cb0c6b056428a4a8c2e5d",
              "lessThan": "638e1ca5d4e2b4fdbb209db64926d013b34f3b79",
              "versionType": "git"
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              "status": "affected",
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              "lessThan": "8178f59d76570b152d836bde07f5997f15861f04",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3d7d407dfb05b257e15cb0c6b056428a4a8c2e5d",
              "lessThan": "775d4cde1f9737796ce7d8393521e9e8c5b49891",
              "versionType": "git"
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            {
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              "lessThan": "0225c1d637687b03726f00ac65b6def843d2c464",
              "versionType": "git"
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          ],
          "programFiles": [
            "drivers/platform/x86/amd/pmc/mp1_stb.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.18"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.18",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/platform/x86/amd/pmc/mp1_stb.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-11T20:19:10.560",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0225c1d637687b03726f00ac65b6def843d2c464",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/638e1ca5d4e2b4fdbb209db64926d013b34f3b79",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/775d4cde1f9737796ce7d8393521e9e8c5b49891",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8178f59d76570b152d836bde07f5997f15861f04",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86/amd/pmc: Propagate SMU errors and validate S2D address\n\namd_stb_s2d_init() discards the return value of several S2D SMU commands.\nWhen the SMU refuses a command (e.g. \"SMU cmd failed. err: 0xff\") the\nfailure is only noticed indirectly - if at all - and reported as -EIO,\nmasking the real error.\n\nMore seriously, the S2D_PHYS_ADDR_LOW/HIGH return values are ignored, so\non failure phys_addr_low/hi are left uninitialised and the assembled\naddress is passed straight to devm_ioremap().  When the SMU leaves them at\nzero this maps physical address 0 and trips the ioremap-on-RAM warning:\n\n  amd_pmc AMDI000B:00: SMU cmd failed. err: 0xff\n  ioremap on RAM at 0x0000000000000000 - 0x0000000000ffffff\n  WARNING: CPU: 13 PID: 4592 at arch/x86/mm/ioremap.c:...\n\nCheck the return value of each SMU command and propagate it, and reject a\nzero physical address before calling devm_ioremap()."
    }
  ],
  "lastModified": "2026-10-03T11:17:41.710",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}