FKIE_CVE-2024-44965

Vulnerability from fkie_nvd - Published: 2024-09-04 19:15 - Updated: 2025-11-03 23:15
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/18da1b27ce16a14a9b636af9232acb4fb24f4c9ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/25a727233a40a9b33370eec9f0cad67d8fd312f8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/41e71dbb0e0a0fe214545fe64af031303a08524cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4d143ae782009b43b4f366402e5c37f59d4e4346Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5c580c1050bcbc15c3e78090859d798dcf8c9763Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ca07aab70dd3b5e7fddb62d7a6ecd7a7d6d0b2edPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d00c9b4bbc442d99e1dafbdfdab848bc1ead73f6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/df3eecb5496f87263d171b254ca6e2758ab3c35cPatch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.11
To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: x86/mm: Corregir la suposici\u00f3n de alineaci\u00f3n de pti_clone_pgtable() Guenter inform\u00f3 de fallos sospechosos en una compilaci\u00f3n de i386-nosmp que utilizaba GCC-11 que ten\u00edan la forma de trampas infinitas hasta el agotamiento de la pila de entrada y luego #DF desde la protecci\u00f3n de la pila. Result\u00f3 que pti_clone_pgtable() ten\u00eda suposiciones de alineaci\u00f3n en la direcci\u00f3n de inicio, en particular, supone con fuerza que el inicio est\u00e1 alineado con PMD. Esto es cierto en x86_64, pero no es cierto en absoluto en i386. Estas suposiciones pueden provocar que la condici\u00f3n final funcione mal, lo que lleva a un clon \"corto\". \u00bfAdivina qu\u00e9 ocurre cuando la asignaci\u00f3n de usuario tiene una copia corta del texto de entrada? Utiliza la forma de incremento correcta para addr para evitar suposiciones de alineaci\u00f3n."
    }
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  "id": "CVE-2024-44965",
  "lastModified": "2025-11-03T23:15:44.627",
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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        "source": "nvd@nist.gov",
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  "published": "2024-09-04T19:15:30.990",
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  "vulnStatus": "Modified",
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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