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CVE-2026-89616

Estado: RecibidaAlta (7.5)—

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

fs/ntfs3: fix info-leak on partial LZNT decompress in ni_read_frame()

ni_read_frame() decompresses an LZNT $DATA frame into the vmapped target pages and then trusts decompress_lznt()'s return value:

decompress_lznt() stops as soon as the compressed stream is exhausted (e.g. a zero chunk header) and returns the number of bytes it actually wrote, which may be far less than frame_size. The bytes between unc_size and frame_size are never written.

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The only memset() that follows zeroes the region beyond i_valid; when the frame lies entirely within the file's valid size that memset() does not run, so the gap retains whatever was in the just-vmapped pages. All pages are then marked uptodate and returned to userspace, disclosing uninitialized (recently-freed) kernel page memory. A crafted compressed file whose stream decompresses to only a few bytes leaks the remainder of every frame on a plain read(2), which is enough to recover kernel pointers and defeat KASLR.

Zero the [unc_size, frame_size) tail immediately after a successful LZNT decompress so the remainder reads back as zero.

Detalles técnicos trazas, registros y código del informe original
  unc_size = decompress_lznt(frame_ondisk, ondisk_size, frame_mem,
                             frame_size);
  if ((ssize_t)unc_size < 0)        err = unc_size;
  else if (!unc_size || unc_size > frame_size)  err = -EINVAL;

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.

CVSS N/N/N indica acceso remoto sin privilegios; lectura de memoria kernel no inicializada (confidencialidad alta) mediante archivo NTFS comprimido malformado expone punteros y vence KASLR.

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

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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-2026-89616",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "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": "4342306f0f0d5ff4315a204d315c1b51b914fca5",
              "lessThan": "7d60a4c49af4d5cb88aa7cbf998d0408bd415055",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4342306f0f0d5ff4315a204d315c1b51b914fca5",
              "lessThan": "cd40eee4923d104ebec9ac7513b971bc441e431d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4342306f0f0d5ff4315a204d315c1b51b914fca5",
              "lessThan": "77d8efd04745cda23858546afdbd9d07b591758e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4342306f0f0d5ff4315a204d315c1b51b914fca5",
              "lessThan": "0f699ddb290a24b37e1bc9bf1e3c9dbccf564bea",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4342306f0f0d5ff4315a204d315c1b51b914fca5",
              "lessThan": "376ee45659a4b943df672ad275c63da00655f929",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4342306f0f0d5ff4315a204d315c1b51b914fca5",
              "lessThan": "4a1b39b2e10eb8de86265e80cf2be4396bc1dce4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4342306f0f0d5ff4315a204d315c1b51b914fca5",
              "lessThan": "35d1ea92c7d946e2ebdbe36cdb2c969c8704bebd",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/ntfs3/frecord.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.15",
              "versionType": "semver"
            },
            {
              "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": [
            "fs/ntfs3/frecord.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-11T20:19:46.783",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0f699ddb290a24b37e1bc9bf1e3c9dbccf564bea",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/35d1ea92c7d946e2ebdbe36cdb2c969c8704bebd",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/376ee45659a4b943df672ad275c63da00655f929",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4a1b39b2e10eb8de86265e80cf2be4396bc1dce4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/77d8efd04745cda23858546afdbd9d07b591758e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7d60a4c49af4d5cb88aa7cbf998d0408bd415055",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/cd40eee4923d104ebec9ac7513b971bc441e431d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: fix info-leak on partial LZNT decompress in ni_read_frame()\n\nni_read_frame() decompresses an LZNT $DATA frame into the vmapped target\npages and then trusts decompress_lznt()'s return value:\n\n  unc_size = decompress_lznt(frame_ondisk, ondisk_size, frame_mem,\n                             frame_size);\n  if ((ssize_t)unc_size < 0)        err = unc_size;\n  else if (!unc_size || unc_size > frame_size)  err = -EINVAL;\n\ndecompress_lznt() stops as soon as the compressed stream is exhausted\n(e.g. a zero chunk header) and returns the number of bytes it actually\nwrote, which may be far less than frame_size. The bytes between unc_size\nand frame_size are never written. The only memset() that follows zeroes\nthe region beyond i_valid; when the frame lies entirely within the file's\nvalid size that memset() does not run, so the gap retains whatever was in\nthe just-vmapped pages. All pages are then marked uptodate and returned\nto userspace, disclosing uninitialized (recently-freed) kernel page\nmemory. A crafted compressed file whose stream decompresses to only a few\nbytes leaks the remainder of every frame on a plain read(2), which is\nenough to recover kernel pointers and defeat KASLR.\n\nZero the [unc_size, frame_size) tail immediately after a successful LZNT\ndecompress so the remainder reads back as zero."
    }
  ],
  "lastModified": "2026-09-14T13:19:15.547",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}