CVE-2026-90231

Full vulnerability record from the local CVENow database.

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.

Severity

HIGH

CVSS score

8.4 (v3.1)

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-09-17 17:17:18.930000

Last modified

2026-10-21 13:20:43.853000

View original CVE JSON

{
  "id": "CVE-2026-90231",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-17T17:17:18.930",
  "lastModified": "2026-10-21T13:20:43.853",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: fix unconfined user namespace restriction forced stack\n\nIf a task is already confined by a stack the unprivileged transition\nrestriction on unconfined is not correctly, applied. This results in\nan escape if two transitions through an unconfined profile can be\nexecuted.\n\nFix this by pushing the check into the per profile label build. The\ncheck will always be done against unconfined and result in a stack of\njust the unconfined component when necessary."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "security/apparmor/domain.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc",
              "lessThan": "fdd341654471cae4fbd9635d32b848cd0c8bc437",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc",
              "lessThan": "7d1099b86356df81c379159bfb8a598aaf83ce81",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc",
              "lessThan": "7da0bdf0610f6d35bbb061536a47fc41646306f0",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc",
              "lessThan": "08c2f7c8d4b1434cfae006f3daf4d1bce330b57b",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "security/apparmor/domain.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.7",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.7",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.114",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.52",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.6",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N",
          "baseScore": 8.4,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 2.0,
        "impactScore": 5.8
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/08c2f7c8d4b1434cfae006f3daf4d1bce330b57b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7d1099b86356df81c379159bfb8a598aaf83ce81",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7da0bdf0610f6d35bbb061536a47fc41646306f0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fdd341654471cae4fbd9635d32b848cd0c8bc437",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}