{
  "id": "CVE-2026-98171",
  "url": "https://spydr.io/cve/CVE-2026-98171",
  "published": "2026-10-06T09:17:58.773Z",
  "modified": "2026-10-07T07:17:03.600Z",
  "score": 8.8,
  "severity": "high",
  "cvss_version": "3.1",
  "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
  "score_source": "CNA",
  "epss": 0.00215,
  "epss_percentile": 0.10812,
  "exploited": false,
  "kev": null,
  "ssvc_exploitation": null,
  "vendors": [
    "Linux"
  ],
  "products": [
    "Linux"
  ],
  "cwes": [],
  "description": "In the Linux kernel, the following vulnerability has been resolved: smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs Fix several related bounds checking and pointer lifecycle issues in receive_encrypted_standard()'s handling of compound encrypted frames: - Clear next_buffer after assigning it to server->bigbuf. A stale next_buffer pointer can lead to a use-after-free on subsequent error paths. - Update pdu_length to the decrypted plaintext size (buf_size). Using the pre-decryption length allows NextCommand to point into stale ciphertext residue. - Reject next_cmd values smaller than MID_HEADER_SIZE(server). - Fix an integer overflow in the upper bound check by verifying pdu_length - next_cmd < MID_HEADER_SIZE(server), ensuring the trailing slice is large enough for a header.",
  "status": "Received",
  "score_type": "Secondary",
  "scores": {
    "cvss_v40": null,
    "cvss_v31": 8.8,
    "cvss_v30": null
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/05762c5bc1cfdcac36747994fde2c04387a457f1",
      "tags": []
    },
    {
      "url": "https://git.kernel.org/stable/c/491e33144dee872cffda207f6fcb09260728f803",
      "tags": []
    },
    {
      "url": "https://git.kernel.org/stable/c/72eaef1f37a3b6bec11c342736834dc3707be3e4",
      "tags": []
    },
    {
      "url": "https://git.kernel.org/stable/c/858d5ac22cb889266993e7670f9f0c4f4aeedd78",
      "tags": []
    },
    {
      "url": "https://git.kernel.org/stable/c/8749946579708ea0d339034bb7f423a67dbe89cf",
      "tags": []
    },
    {
      "url": "https://git.kernel.org/stable/c/96c436e4b010711452b2872558938f4ef276492a",
      "tags": []
    }
  ],
  "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98171",
  "covered_in": [],
  "attribution": [
    {
      "source": "NVD",
      "url": "https://nvd.nist.gov",
      "notice": "This product uses data from the NVD API but is not endorsed or certified by the NVD."
    },
    {
      "source": "CISA KEV",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "notice": "Known exploited vulnerabilities from the CISA KEV catalog."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss",
      "notice": "Exploit prediction scores from FIRST EPSS."
    }
  ]
}