{
  "cveId": "CVE-2026-98525",
  "url": "https://patchblox.com/security/cve/CVE-2026-98525",
  "summary": "CVE-2026-98525 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-98525, released October 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "mctp: route: iterate socket tag list in mctp_lookup_prealloc_tag()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mctp: route: iterate socket tag list in mctp_lookup_prealloc_tag()  When a socket transmits a packet with MCTP_TAG_PREALLOC set, mctp_lookup_prealloc_tag() iterates over the per-netns \u0026mns-\u003Ekeys list and matches netid, req_tag, peer_addr, and manual_alloc, without checking whether tmp-\u003Esk == \u0026msk-\u003Esk. This allows any MCTP socket in the same network namespace to use and consume another socket\u0027s preallocated tag.  Iterate the socket\u0027s own tag list (\u0026msk-\u003Ekeys via sklist) instead of the namespace-wide \u0026mns-\u003Ekeys list in mctp_lookup_prealloc_tag(), ensuring that only tags allocated by msk are matched.  Tested in QEMU against Linux 7.3.0-rc3 by allocating a manual tag (0x18) on socket A via SIOCMCTPALLOCTAG for peer EID 9 and sending a 4-byte message with MCTP_TAG_PREALLOC from socket B in the same network namespace. On the unfixed kernel, sendto(sock_b) using socket A\u0027s preallocated tag succeeds (ret = 4); with this patch applied, sendto(sock_b) fails with -ENOENT (errno = 2) while sendto(sock_a) succeeds (ret = 4).",
  "published": "2026-10-18T16:17:03Z",
  "severity": "Moderate",
  "cvss": 6.1,
  "epss": 0.00209,
  "epssPercentile": 0.11128,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98525",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.113-1",
      "fix": "DEBIAN-CVE-2026-98525",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98525",
      "released": "2026-10-19T16:27:52Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.9-1",
      "fix": "DEBIAN-CVE-2026-98525",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98525",
      "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-2026-98525",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98525",
      "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"
  }
}