{
  "cveId": "CVE-2026-98493",
  "url": "https://patchblox.com/security/cve/CVE-2026-98493",
  "summary": "CVE-2026-98493 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-98493, released October 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "net: ipconfig: bound DHCP option construction",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net: ipconfig: bound DHCP option construction  ic_dhcp_init_options() appends the hostname (option 12), vendor-class (option 60) and client-ID (option 61) options into the fixed 312-byte bootp_pkt.exten[] buffer.  Only the client-ID branch checked the remaining space; the hostname and vendor-class writes were unbounded.  A 64-byte hostname together with the maximum 252-byte dhcpclass= identifier needs 18 \u002B (2 \u002B 64) \u002B (2 \u002B 252) = 338 of the 312 available bytes even before the terminating END marker, so the vendor-class memcpy runs past the end of exten[].  With CONFIG_FORTIFY_SOURCE this is reported as a field-spanning write and, when the kernel is booted with panic_on_warn=1, aborts boot with a panic.  Route the optional options through a common helper that makes sure the option, its 2-byte header and the END marker all fit and drops an option that would not.  Configurations with short options keep sending exactly the same bytes as before.",
  "published": "2026-10-18T16:17:00Z",
  "severity": "Moderate",
  "cvss": 4.4,
  "epss": 0.00211,
  "epssPercentile": 0.11328,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98493",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.113-1",
      "fix": "DEBIAN-CVE-2026-98493",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98493",
      "released": "2026-10-19T16:27:52Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.9-1",
      "fix": "DEBIAN-CVE-2026-98493",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98493",
      "released": "2026-10-19T16:27:52Z"
    },
    {
      "platform": "linux",
      "product": "linux-6.12",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.12.113-1~deb12u1",
      "fix": "DEBIAN-CVE-2026-98493",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98493",
      "released": "2026-10-19T16:27:52Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}