« Volver al listado

CVE-2026-89573

Estado: RecibidaAlta (7.8)—

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

dm array: reject an array block whose value size is not the caller's

array_block_check() can only compare the header against itself, so a block with value_size 4 and max_entries 1018 is internally consistent and passes. dm-cache keeps two arrays -- mappings at 8 bytes and hints at 4 -- and the roots for both live in the superblock. Point the mappings root at a hint block and __load_mappings() walks it through an info whose value size is 8, so element_at() strides 8 bytes over 4-byte entries and reaches offset 8160 of a 4096-byte block.

Leer descripción completaMostrar menos

get_ablock() and __shadow_ablock() are the two places that hold the block and the caller at once. Reject there when the two value sizes disagree. Arrays only ever read their own blocks, so this fires on crafted metadata only.

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 (AV:L, PR:L) en dm-cache del kernel Linux que permite lectura de memoria fuera de límites (element_at() accede a offset 8160 en bloque de 4096 bytes) y DoS. Requiere escalada de privilegios local para apuntar el bloque root a metadatos manipulados.

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)

Mostrar
{
  "id": "CVE-2026-89573",
  "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": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
              "lessThan": "35cd3b278448c79614f65ab6bbc9ed348d847df9",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
              "lessThan": "a8237cb8fa0a628d903e76635bfdeae4202036b9",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
              "lessThan": "a530a9a419a7c5fdb7dae55ffa2dd7a130631842",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
              "lessThan": "522fa26da24ccaa298ebe3c1c97395d2d63dfc21",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
              "lessThan": "7bf4b5cb42a4e27f36bcbc6209d82a5da9c0168c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
              "lessThan": "ac4a5eb8b002a0742c938fc98b922e243f53573a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
              "lessThan": "cb409b38b0232ee4385ef55cddcd6fbdd011a8a2",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
              "lessThan": "4538a287bdf5d0f9a379c678e5262b9f5783f547",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/md/persistent-data/dm-array.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.9"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "3.9",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.109",
              "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/md/persistent-data/dm-array.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-11T20:19:41.390",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/35cd3b278448c79614f65ab6bbc9ed348d847df9",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4538a287bdf5d0f9a379c678e5262b9f5783f547",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/522fa26da24ccaa298ebe3c1c97395d2d63dfc21",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7bf4b5cb42a4e27f36bcbc6209d82a5da9c0168c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a530a9a419a7c5fdb7dae55ffa2dd7a130631842",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a8237cb8fa0a628d903e76635bfdeae4202036b9",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ac4a5eb8b002a0742c938fc98b922e243f53573a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/cb409b38b0232ee4385ef55cddcd6fbdd011a8a2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm array: reject an array block whose value size is not the caller's\n\narray_block_check() can only compare the header against itself, so a block\nwith value_size 4 and max_entries 1018 is internally consistent and passes.\ndm-cache keeps two arrays -- mappings at 8 bytes and hints at 4 -- and the\nroots for both live in the superblock. Point the mappings root at a hint\nblock and __load_mappings() walks it through an info whose value size is 8,\nso element_at() strides 8 bytes over 4-byte entries and reaches offset 8160\nof a 4096-byte block.\n\nget_ablock() and __shadow_ablock() are the two places that hold the block\nand the caller at once. Reject there when the two value sizes disagree.\nArrays only ever read their own blocks, so this fires on crafted metadata\nonly."
    }
  ],
  "lastModified": "2026-09-14T13:19:11.893",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}