{
  "cveId": "CVE-2026-90231",
  "url": "https://patchblox.com/security/cve/CVE-2026-90231",
  "summary": "CVE-2026-90231 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-90231, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "apparmor: fix unconfined user namespace restriction forced stack",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  apparmor: fix unconfined user namespace restriction forced stack  If a task is already confined by a stack the unprivileged transition restriction on unconfined is not correctly, applied. This results in an escape if two transitions through an unconfined profile can be executed.  Fix this by pushing the check into the per profile label build. The check will always be done against unconfined and result in a stack of just the unconfined component when necessary.",
  "published": "2026-09-17T17:17:18Z",
  "severity": "high",
  "cvss": 8.4,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N",
  "epss": 0.0016,
  "epssPercentile": 0.0525,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-90231",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2026-90231",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90231",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-90231",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90231",
      "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"
  }
}