{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-23411",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-23411"
  ],
  "published": "2026-04-01T08:37:22Z",
  "summary": "apparmor: fix race between freeing data and fs accessing it",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: fix race between freeing data and fs accessing it\n\nAppArmor was putting the reference to i_private data on its end after\nremoving the original entry from the file system. However the inode\ncan aand does live beyond that point and it is possible that some of\nthe fs call back functions will be invoked after the reference has\nbeen put, which results in a race between freeing the data and\naccessing it through the fs.\n\nWhile the rawdata/loaddata is the most likely candidate to fail the\nrace, as it has the fewest references. If properly crafted it might be\npossible to trigger a race for the other types stored in i_private.\n\nFix this by moving the put of i_private referenced data to the correct\nplace which is during inode eviction.",
  "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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    {
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-23411"
    },
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    "severity": {
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      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerability is in apparmorfs, a local filesystem interface at /sys/kernel/security/apparmor/. Exploitation requires local system access to perform filesystem operations (open, read, mkdir, rmdir).\nAC:L - The attacker controls both sides of the race \u2014 they can concurrently open/read apparmorfs files and remove profiles/namespaces. Per kernel guidance, race conditions where the attacker controls both sides are AC:L.\nPR:L - In container environments with AppArmor namespaces (LXD, some Kubernetes), container root (effectively low-privileged from host perspective) has matching AA namespace levels and can manage AppArmor policy within its namespace with default unprivileged_userns_apparmor_policy=1.\nUI:N - No user interaction is needed. The attacker triggers both the file access and the profile/namespace removal concurrently without requiring any victim action.\nS:U - This is a standard kernel privilege escalation via use-after-free in the AppArmor subsystem. The vulnerability and impact are within the same security authority (kernel space).\nC:H - The use-after-free gives the attacker control over freed object contents through heap spraying, enabling arbitrary kernel memory reads.\nI:H - The use-after-free enables heap spraying to control freed objects, providing arbitrary write primitives and potential control flow hijacking for kernel code execution.\nA:H - The use-after-free causes kernel crashes (accessing freed/corrupted memory leads to oops or panic) even without full exploitation."
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}