{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-23268",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-23268"
  ],
  "published": "2026-03-18T17:54:54Z",
  "summary": "apparmor: fix unprivileged local user can do privileged policy management",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: fix unprivileged local user can do privileged policy management\n\nAn unprivileged local user can load, replace, and remove profiles by\nopening the apparmorfs interfaces, via a confused deputy attack, by\npassing the opened fd to a privileged process, and getting the\nprivileged process to write to the interface.\n\nThis does require a privileged target that can be manipulated to do\nthe write for the unprivileged process, but once such access is\nachieved full policy management is possible and all the possible\nimplications that implies: removing confinement, DoS of system or\ntarget applications by denying all execution, by-passing the\nunprivileged user namespace restriction, to exploiting kernel bugs for\na local privilege escalation.\n\nThe policy management interface can not have its permissions simply\nchanged from 0666 to 0600 because non-root processes need to be able\nto load policy to different policy namespaces.\n\nInstead ensure the task writing the interface has privileges that\nare a subset of the task that opened the interface. This is already\ndone via policy for confined processes, but unconfined can delegate\naccess to the opened fd, by-passing the usual policy check.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-23268"
    },
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
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      "cvss_v3_severity": "High",
      "scenario": "AV:L - The attacker must be a local user to open the apparmorfs interface files and pass the file descriptor to a privileged process via local IPC mechanisms.\nAC:L - On typical Linux systems (desktop, server, Android), privileged daemons that accept and act on fds from unprivileged users are common (D-Bus services, systemd units). The attacker can reliably identify and leverage such confused deputies.\nPR:L - Requires a basic unprivileged local user account. The apparmorfs interface files are created with 0666 permissions, so any local user can open them.\nUI:N - No user interaction is needed. The confused deputy is a system service/daemon that can be programmatically triggered, not a human user who must take action.\nS:U - The vulnerability and its impact remain within the kernel security authority. While AppArmor policy manipulation is severe, it is standard kernel privilege escalation within the same security domain.\nC:H - By removing AppArmor confinement profiles, the attacker can access information previously protected by mandatory access control policies, enabling arbitrary information disclosure.\nI:H - The attacker gains full policy management capabilities: loading arbitrary policies, replacing existing ones, and removing confinement. This allows arbitrary modification of the system's mandatory access control, fundamentally compromising integrity.\nA:H - As stated in the commit, the attacker can cause DoS of the system or target applications by loading policies that deny all execution, effectively making the system non-functional."
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}