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CVE-2026-23007

Estado: AnalizadaMedia (5.5)—

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

block: zero non-PI portion of auto integrity buffer

The auto-generated integrity buffer for writes needs to be fully initialized before being passed to the underlying block device, otherwise the uninitialized memory can be read back by userspace or anyone with physical access to the storage device. If protection information is generated, that portion of the integrity buffer is already initialized. The integrity data is also zeroed if PI generation is disabled via sysfs or the PI tuple size is 0.

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However, this misses the case where PI is generated and the PI tuple size is nonzero, but the metadata size is larger than the PI tuple. In this case, the remainder ("opaque") of the metadata is left uninitialized. Generalize the BLK_INTEGRITY_CSUM_NONE check to cover any case when the metadata is larger than just the PI tuple.

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).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-23007",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
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      "affectedData": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
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              "status": "affected",
              "version": "c546d6f438338017480d105ab597292da67f6f6a",
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          "programFiles": [
            "block/bio-integrity-auto.c"
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          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.11"
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            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.11",
              "versionType": "semver"
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            {
              "status": "unaffected",
              "version": "6.18.7",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "block/bio-integrity-auto.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-01-25T15:15:55.580",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/ca22c566b89164f6e670af56ecc45f47ef3df819",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d6072557b90e0c557df319a56f4a9dc482706d2c",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-908"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock: zero non-PI portion of auto integrity buffer\n\nThe auto-generated integrity buffer for writes needs to be fully\ninitialized before being passed to the underlying block device,\notherwise the uninitialized memory can be read back by userspace or\nanyone with physical access to the storage device. If protection\ninformation is generated, that portion of the integrity buffer is\nalready initialized. The integrity data is also zeroed if PI generation\nis disabled via sysfs or the PI tuple size is 0. However, this misses\nthe case where PI is generated and the PI tuple size is nonzero, but the\nmetadata size is larger than the PI tuple. In this case, the remainder\n(\"opaque\") of the metadata is left uninitialized.\nGeneralize the BLK_INTEGRITY_CSUM_NONE check to cover any case when the\nmetadata is larger than just the PI tuple."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbloque: poner a cero la porción no-PI del búfer de integridad automático\n\nEl búfer de integridad autogenerado para escrituras necesita ser completamente inicializado antes de ser pasado al dispositivo de bloque subyacente, de lo contrario la memoria no inicializada puede ser leída por el espacio de usuario o cualquier persona con acceso físico al dispositivo de almacenamiento. Si se genera información de protección, esa porción del búfer de integridad ya está inicializada. Los datos de integridad también se ponen a cero si la generación de PI está deshabilitada a través de sysfs o el tamaño de la tupla PI es 0. Sin embargo, esto omite el caso en que se genera PI y el tamaño de la tupla PI no es cero, pero el tamaño de los metadatos es mayor que la tupla PI. En este caso, el resto ('opaco') de los metadatos se deja sin inicializar.\nGeneralizar la comprobación BLK_INTEGRITY_CSUM_NONE para cubrir cualquier caso en que los metadatos sean más grandes que solo la tupla PI."
    }
  ],
  "lastModified": "2026-06-17T10:20:41.937",
  "configurations": [
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      "nodes": [
        {
          "negate": false,
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}