GHSA-XG2Q-7399-F2R3

Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-09-16 15:30
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

selinux: fix overlayfs mmap() and mprotect() access checks

The existing SELinux security model for overlayfs is to allow access if the current task is able to access the top level file (the "user" file) and the mounter's credentials are sufficient to access the lower level file (the "backing" file). Unfortunately, the current code does not properly enforce these access controls for both mmap() and mprotect() operations on overlayfs filesystems.

This patch makes use of the newly created security_mmap_backing_file() LSM hook to provide the missing backing file enforcement for mmap() operations, and leverages the backing file API and new LSM blob to provide the necessary information to properly enforce the mprotect() access controls.

Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
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{
  "affected": [],
  "aliases": [
    "CVE-2026-46054"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-280"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:25Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nselinux: fix overlayfs mmap() and mprotect() access checks\n\nThe existing SELinux security model for overlayfs is to allow access if\nthe current task is able to access the top level file (the \"user\" file)\nand the mounter\u0027s credentials are sufficient to access the lower\nlevel file (the \"backing\" file).  Unfortunately, the current code does\nnot properly enforce these access controls for both mmap() and mprotect()\noperations on overlayfs filesystems.\n\nThis patch makes use of the newly created security_mmap_backing_file()\nLSM hook to provide the missing backing file enforcement for mmap()\noperations, and leverages the backing file API and new LSM blob to\nprovide the necessary information to properly enforce the mprotect()\naccess controls.",
  "id": "GHSA-xg2q-7399-f2r3",
  "modified": "2026-09-16T15:30:36Z",
  "published": "2026-05-27T15:33:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46054"
    },
    {
      "type": "WEB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46054.json"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d844702198395d3f80222777030f69db6be6b709"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cd0e707a927a70cdfd8bc5a512a9719a87f5ed51"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bc6c380c1159de52a252ed11f19a42c47f60a735"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8bacd09f12c27710228562e4d13163e58c5f4a45"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82544d36b1729153c8aeb179e84750f0c085d3b1"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482025"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-46054"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:67723"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:67721"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:59473"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:59091"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:52764"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:52667"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:52649"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:51746"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:30848"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:27812"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:27811"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:25191"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}



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