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CVE-2026-98143

Estado: En análisisAlta (7.8)—

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

accel: ethosu: Don't read the U65 rounding mode as a storage mode

Bits 15:14 of NPU_SET_{IFM,OFM}_PRECISION select the activation storage mode on U85 only. On U65 the same field holds the rounding mode, and the command stream parser has read it as a storage mode since the driver was added.

That went unnoticed while unknown values fell through the switch, but now that they are rejected, every U65 command stream that asks for natural rounding (2) fails CMDSTREAM_BO_CREATE with -EINVAL.

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Mesa emits it for average pooling, concatenation, split, unpack, strided slice, LUT and argmax, which is 72 failures of the Teflon test suite on an i.MX93. Truncating rounding (1) is misread as well: it picks the two-tile address path and computes a bogus feature map size from tile bases the command stream never set.

Read the field as a storage mode only on the hardware where it is one.

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 local en kernel (AV:L/PR:L) que causa rechazo de comando válido (-EINVAL) y cálculo incorrecto de parámetros, resultando en DoS de funcionalidad (average pooling, LUT, etc.) y posible corrupción de datos de feature map.

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 ProgramRestrict File and Directory PermissionsRemote Data StorageFilter Network TrafficExecution PreventionEncrypt Sensitive Information

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-2026-98143",
  "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": "5a5e9c0228e613f0ef2a58b9782d7c0ea8f1e58b",
              "lessThan": "6b08adbda8ea797849e3654ce12cb3856ce6051a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5a5e9c0228e613f0ef2a58b9782d7c0ea8f1e58b",
              "lessThan": "db9deec5a345abc538d081fb221dc0b00a9695bd",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/accel/ethosu/ethosu_gem.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.19"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.19",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/accel/ethosu/ethosu_gem.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-25T11:17:45.830",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/6b08adbda8ea797849e3654ce12cb3856ce6051a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/db9deec5a345abc538d081fb221dc0b00a9695bd",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Undergoing Analysis",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel: ethosu: Don't read the U65 rounding mode as a storage mode\n\nBits 15:14 of NPU_SET_{IFM,OFM}_PRECISION select the activation storage\nmode on U85 only. On U65 the same field holds the rounding mode, and the\ncommand stream parser has read it as a storage mode since the driver was\nadded.\n\nThat went unnoticed while unknown values fell through the switch, but\nnow that they are rejected, every U65 command stream that asks for\nnatural rounding (2) fails CMDSTREAM_BO_CREATE with -EINVAL. Mesa emits\nit for average pooling, concatenation, split, unpack, strided slice, LUT\nand argmax, which is 72 failures of the Teflon test suite on an i.MX93.\nTruncating rounding (1) is misread as well: it picks the two-tile\naddress path and computes a bogus feature map size from tile bases the\ncommand stream never set.\n\nRead the field as a storage mode only on the hardware where it is one."
    }
  ],
  "lastModified": "2026-09-30T14:10:59.253",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}