{
  "cveId": "CVE-2026-31432",
  "url": "https://patchblox.com/security/cve/CVE-2026-31432",
  "summary": "CVE-2026-31432 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-31432, released May 15, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "ksmbd: fix OOB write in QUERY_INFO for compound requests",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ksmbd: fix OOB write in QUERY_INFO for compound requests  When a compound request such as READ \u002B QUERY_INFO(Security) is received, and the first command (READ) consumes most of the response buffer, ksmbd could write beyond the allocated buffer while building a security descriptor.  The root cause was that smb2_get_info_sec() checked buffer space using ppntsd_size from xattr, while build_sec_desc() often synthesized a significantly larger descriptor from POSIX ACLs.  This patch introduces smb_acl_sec_desc_scratch_len() to accurately compute the final descriptor size beforehand, performs proper buffer checking with smb2_calc_max_out_buf_len(), and uses exact-sized allocation \u002B iov pinning.",
  "published": "2026-04-22T09:16:21Z",
  "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": 0.00546,
  "epssPercentile": 0.46041,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-31432",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.85-1",
      "fix": "DEBIAN-CVE-2026-31432",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-31432",
      "released": "2026-05-15T16:01:09Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.19.12-1",
      "fix": "DEBIAN-CVE-2026-31432",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-31432",
      "released": "2026-05-15T16:01:09Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}