{
  "cveId": "CVE-2026-31630",
  "url": "https://patchblox.com/security/cve/CVE-2026-31630",
  "summary": "CVE-2026-31630 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-31630, released May 15, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "rxrpc: proc: size address buffers for %pISpc output",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  rxrpc: proc: size address buffers for %pISpc output  The AF_RXRPC procfs helpers format local and remote socket addresses into fixed 50-byte stack buffers with \u0022%pISpc\u0022.  That is too small for the longest current-tree IPv6-with-port form the formatter can produce. In lib/vsprintf.c, the compressed IPv6 path uses a dotted-quad tail not only for v4mapped addresses, but also for ISATAP addresses via ipv6_addr_is_isatap().  As a result, a case such as    [ffff:ffff:ffff:ffff:0:5efe:255.255.255.255]:65535  is possible with the current formatter. That is 50 visible characters, so 51 bytes including the trailing NUL, which does not fit in the existing char[50] buffers used by net/rxrpc/proc.c.  Size the buffers from the formatter\u0027s maximum textual form and switch the call sites to scnprintf().  Changes since v1: - correct the changelog to cite the actual maximum current-tree case   explicitly - frame the proof around the ISATAP formatting path instead of the earlier   mapped-v4 example",
  "published": "2026-04-24T15:16:42Z",
  "severity": "Important",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00175,
  "epssPercentile": 0.07009,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-31630",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.176-1",
      "fix": "DEBIAN-CVE-2026-31630",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-31630",
      "released": "2026-05-15T16:01:09Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2026-31630",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-31630",
      "released": "2026-05-15T16:01:09Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.19.13-1",
      "fix": "DEBIAN-CVE-2026-31630",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-31630",
      "released": "2026-05-15T16:01:09Z"
    }
  ],
  "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"
  }
}