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CVE-2026-98167

Estado: RecibidaSin puntuar—

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

smb: client: fix server->total_read for compound encrypted PDUs

In receive_encrypted_standard(), server->total_read is left at the full decrypted frame size when walking sub-PDUs of a compound encrypted frame. As a result, cifs_handle_standard() passes this full size to smb2_check_message(), causing the PDU length guards to incorrectly validate the entire compound frame instead of the current sub-PDU.

This allows truncated non-last sub-PDUs to bypass length validation, leading to out-of-bounds reads in smb2_get_data_area_len().

Fix this by setting server->total_read to the true length of the current sub-PDU: next_cmd for non-last sub-PDUs, and the remaining pdu_length for the last one.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

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)

⚠ 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-2026-98167",
  "cveTags": [],
  "metrics": {},
  "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": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
              "lessThan": "8703539d22fdbc13dd2db090ee199c3a427b8ea0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
              "lessThan": "e78fc1d240b27349b45a0f1c3e3c2c401d7e230d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
              "lessThan": "a46eb242e9eef3a3897d166748b23303c516e870",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
              "lessThan": "ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
              "lessThan": "282b72f9a7ef31296c48366db4128882999cc048",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
              "lessThan": "f73726b83e4756fdaa099e1bc1143293bd57ad79",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/smb/client/smb2ops.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.19"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.19",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.54",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc4",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/smb/client/smb2ops.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-10-06T09:17:58.177",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/282b72f9a7ef31296c48366db4128882999cc048",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8703539d22fdbc13dd2db090ee199c3a427b8ea0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a46eb242e9eef3a3897d166748b23303c516e870",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e78fc1d240b27349b45a0f1c3e3c2c401d7e230d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f73726b83e4756fdaa099e1bc1143293bd57ad79",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix server->total_read for compound encrypted PDUs\n\nIn receive_encrypted_standard(), server->total_read is left at the\nfull decrypted frame size when walking sub-PDUs of a compound encrypted\nframe. As a result, cifs_handle_standard() passes this full size\nto smb2_check_message(), causing the PDU length guards to incorrectly\nvalidate the entire compound frame instead of the current sub-PDU.\n\nThis allows truncated non-last sub-PDUs to bypass length validation,\nleading to out-of-bounds reads in smb2_get_data_area_len().\n\nFix this by setting server->total_read to the true length of the\ncurrent sub-PDU: next_cmd for non-last sub-PDUs, and the remaining\npdu_length for the last one."
    }
  ],
  "lastModified": "2026-10-06T09:17:58.177",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}