{
  "cveId": "CVE-2026-99110",
  "url": "https://patchblox.com/security/cve/CVE-2026-99110",
  "summary": "CVE-2026-99110 is fixed in linux on 1 platform by DEBIAN-CVE-2026-99110 (version 6.12.115-2), released November 3, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "smb: client: fix heap overflow in cifs_do_set_acl()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  smb: client: fix heap overflow in cifs_do_set_acl()  cifs_set_acl() validates ACL size using posix_acl_xattr_size():          4 \u002B (count * 8)  // 4-byte header \u002B 8 bytes per ACE  cifs_do_set_acl() then calls posix_acl_to_cifs() to write the CIFS wire format into the same buffer:          6 \u002B (count * 10)  // 6-byte header \u002B 10 bytes per ACE  An ACL that passes the xattr-based check in cifs_set_acl() can overflow the heap when posix_acl_to_cifs() writes the larger CIFS format.  Validate the CIFS format size against the remaining buffer space and USHRT_MAX before converting--data_count is __u16, so sizes above USHRT_MAX truncate the on-wire packet length, causing the server to apply a partial ACL.  Replace MaxDataCount = 1000 with min(CIFSMaxBufSize, USHRT_MAX).",
  "published": "2026-10-28T11:17:30Z",
  "severity": "Important",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00134,
  "epssPercentile": 0.02955,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-99110",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2026-99110",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99110",
      "released": "2026-11-03T18:58:21Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}