{
  "cveId": "CVE-2026-90153",
  "url": "https://patchblox.com/security/cve/CVE-2026-90153",
  "summary": "CVE-2026-90153 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-90153, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  ksmbd: bound smb_check_perm_dacl() ACE walks by...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ksmbd: bound smb_check_perm_dacl() ACE walks by DACL size  smb_check_perm_dacl() validates that the DACL fits inside the NT security descriptor, but then bounds its two ACE walks by the remaining NTSD length (acl_size) rather than the DACL\u0027s declared size (pdacl_size).  When pdacl-\u003Esize is smaller than the trailing NTSD buffer, bytes after the declared DACL boundary - still inside the stored security descriptor - are parsed as ACEs during access checks.  A crafted DACL can place an access-granting ACE beyond pdacl-\u003Esize, and the current code accepts it during SMB2_CREATE access validation, while parse_dacl() and smb_inherit_dacl() stop at pdacl_size.  Bound both ACE walks by pdacl_size to match the DACL boundary semantics used elsewhere in the server.  Validation: - semantic KUnit harness shows the post-boundary ACE is selected   before the fix and rejected (EACCES) after it - linux master (7.2-rc6), x86_64",
  "published": "2026-09-17T17:17:08Z",
  "severity": "high",
  "cvss": 8.1,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
  "epss": 0.00522,
  "epssPercentile": 0.44563,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.111-1",
      "fix": "DEBIAN-CVE-2026-90153",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90153",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-90153",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90153",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux-6.12",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.12.111-1~deb12u1",
      "fix": "DEBIAN-CVE-2026-90153",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90153",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}