{
  "cveId": "CVE-2026-99083",
  "url": "https://patchblox.com/security/cve/CVE-2026-99083",
  "summary": "CVE-2026-99083 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-99083, released October 27, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "ksmbd: fix heap out-of-bounds write in krb5_authenticate()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ksmbd: fix heap out-of-bounds write in krb5_authenticate()  In krb5_authenticate(), out_len is calculated to determine available headroom in response_buf for the incoming Kerberos AP-REP token. However, when SMB2_SESSION_SETUP is processed as a non-first element of a compounded SMB2 request, the calculation omits work-\u003Enext_smb2_rsp_hdr_off.  This causes out_len to overstate remaining buffer headroom by the cumulative size of prior responses in the compound chain. Consequently, the length check in ksmbd_krb5_authenticate() (*out_len \u003C= resp-\u003Espnego_blob_len) passes erroneously, allowing memcpy() to write the AP-REP blob past the end of response_buf into adjacent kernel heap memory.  Fix this by subtracting work-\u003Enext_smb2_rsp_hdr_off when computing out_len, ensuring it accurately reflects physical remaining buffer space.",
  "published": "2026-10-23T13:17:32Z",
  "severity": "Important",
  "cvss": 8.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00445,
  "epssPercentile": 0.38904,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-99083",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2026-99083",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99083",
      "released": "2026-10-27T21:14:52Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.12-1",
      "fix": "DEBIAN-CVE-2026-99083",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99083",
      "released": "2026-10-27T21:14:52Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}