GHSA-8PX8-W879-9RMH

Vulnerability from github – Published: 2024-09-04 21:30 – Updated: 2025-11-04 00:31
VLAI?
Details

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

x86/mm: Fix pti_clone_pgtable() alignment assumption

Guenter reported dodgy crashes on an i386-nosmp build using GCC-11 that had the form of endless traps until entry stack exhaust and then

DF from the stack guard.

It turned out that pti_clone_pgtable() had alignment assumptions on the start address, notably it hard assumes start is PMD aligned. This is true on x86_64, but very much not true on i386.

These assumptions can cause the end condition to malfunction, leading to a 'short' clone. Guess what happens when the user mapping has a short copy of the entry text?

Use the correct increment form for addr to avoid alignment assumptions.

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-2024-44965"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-09-04T19:15:30Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/mm: Fix pti_clone_pgtable() alignment assumption\n\nGuenter reported dodgy crashes on an i386-nosmp build using GCC-11\nthat had the form of endless traps until entry stack exhaust and then\n#DF from the stack guard.\n\nIt turned out that pti_clone_pgtable() had alignment assumptions on\nthe start address, notably it hard assumes start is PMD aligned. This\nis true on x86_64, but very much not true on i386.\n\nThese assumptions can cause the end condition to malfunction, leading\nto a \u0027short\u0027 clone. Guess what happens when the user mapping has a\nshort copy of the entry text?\n\nUse the correct increment form for addr to avoid alignment\nassumptions.",
  "id": "GHSA-8px8-w879-9rmh",
  "modified": "2025-11-04T00:31:21Z",
  "published": "2024-09-04T21:30:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-44965"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18da1b27ce16a14a9b636af9232acb4fb24f4c9e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/25a727233a40a9b33370eec9f0cad67d8fd312f8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/41e71dbb0e0a0fe214545fe64af031303a08524c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4d143ae782009b43b4f366402e5c37f59d4e4346"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5c580c1050bcbc15c3e78090859d798dcf8c9763"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ca07aab70dd3b5e7fddb62d7a6ecd7a7d6d0b2ed"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d00c9b4bbc442d99e1dafbdfdab848bc1ead73f6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/df3eecb5496f87263d171b254ca6e2758ab3c35c"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    }
  ],
  "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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