GHSA-W3PR-PQPR-2F83

Vulnerability from github – Published: 2025-09-15 15:31 – Updated: 2025-12-02 03:31
VLAI?
Details

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

vfio/type1: prevent underflow of locked_vm via exec()

When a vfio container is preserved across exec, the task does not change, but it gets a new mm with locked_vm=0, and loses the count from existing dma mappings. If the user later unmaps a dma mapping, locked_vm underflows to a large unsigned value, and a subsequent dma map request fails with ENOMEM in __account_locked_vm.

To avoid underflow, grab and save the mm at the time a dma is mapped. Use that mm when adjusting locked_vm, rather than re-acquiring the saved task's mm, which may have changed. If the saved mm is dead, do nothing.

locked_vm is incremented for existing mappings in a subsequent patch.

Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2023-53171"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-15T14:15:38Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvfio/type1: prevent underflow of locked_vm via exec()\n\nWhen a vfio container is preserved across exec, the task does not change,\nbut it gets a new mm with locked_vm=0, and loses the count from existing\ndma mappings.  If the user later unmaps a dma mapping, locked_vm underflows\nto a large unsigned value, and a subsequent dma map request fails with\nENOMEM in __account_locked_vm.\n\nTo avoid underflow, grab and save the mm at the time a dma is mapped.\nUse that mm when adjusting locked_vm, rather than re-acquiring the saved\ntask\u0027s mm, which may have changed.  If the saved mm is dead, do nothing.\n\nlocked_vm is incremented for existing mappings in a subsequent patch.",
  "id": "GHSA-w3pr-pqpr-2f83",
  "modified": "2025-12-02T03:31:32Z",
  "published": "2025-09-15T15:31:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53171"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/046eca5018f8a5dd1dc2cedf87fb5843b9ea3026"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5a271242716846cc016736fb76be2b40ee49b0c3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a6b2aabe664098d5cf877ae0fd96459464a30e17"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b0790dff0760b7734cf0961f497ad64628ca550b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eafb81c50da899dd80b340c841277acc4a1945b7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.