fkie_cve-2024-44948
Vulnerability from fkie_nvd
Published
2024-09-04 19:15
Modified
2024-09-05 12:53
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: x86/mtrr: Check if fixed MTRRs exist before saving them MTRRs have an obsolete fixed variant for fine grained caching control of the 640K-1MB region that uses separate MSRs. This fixed variant has a separate capability bit in the MTRR capability MSR. So far all x86 CPUs which support MTRR have this separate bit set, so it went unnoticed that mtrr_save_state() does not check the capability bit before accessing the fixed MTRR MSRs. Though on a CPU that does not support the fixed MTRR capability this results in a #GP. The #GP itself is harmless because the RDMSR fault is handled gracefully, but results in a WARN_ON(). Add the missing capability check to prevent this.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/06c1de44d378ec5439db17bf476507d68589bfe9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/34f36e6ee5bd7eff8b2adcd9fcaef369f752d82e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/388f1c954019f253a8383f7eb733f38d541e10b6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/450b6b22acdaac67a18eaf5ed498421ffcf10051
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8a90d3fc7c24608548d3a750671f9dac21d1a462
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8aa79dfb216b865e96ff890bc4ea71650f9bc8d7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/919f18f961c03d6694aa726c514184f2311a4614
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ca7d00c5656d1791e28369919e3e10febe9c3b16
Impacted products
Vendor Product Version


To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/mtrr: Check if fixed MTRRs exist before saving them\n\nMTRRs have an obsolete fixed variant for fine grained caching control\nof the 640K-1MB region that uses separate MSRs. This fixed variant has\na separate capability bit in the MTRR capability MSR.\n\nSo far all x86 CPUs which support MTRR have this separate bit set, so it\nwent unnoticed that mtrr_save_state() does not check the capability bit\nbefore accessing the fixed MTRR MSRs.\n\nThough on a CPU that does not support the fixed MTRR capability this\nresults in a #GP.  The #GP itself is harmless because the RDMSR fault is\nhandled gracefully, but results in a WARN_ON().\n\nAdd the missing capability check to prevent this."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: x86/mtrr: comprobar si existen MTRR fijos antes de guardarlos Los MTRR tienen una variante fija obsoleta para el control de almacenamiento en cach\u00e9 de grano fino de la regi\u00f3n de 640K-1MB que utiliza MSR separados. Esta variante fija tiene un bit de capacidad independiente en el MSR de capacidad MTRR. Hasta ahora, todas las CPU x86 que admiten MTRR tienen este bit independiente configurado, por lo que pas\u00f3 desapercibido que mtrr_save_state() no comprueba el bit de capacidad antes de acceder a los MSR MTRR fijos. Aunque en una CPU que no admite la capacidad MTRR fija, esto da como resultado un #GP. El #GP en s\u00ed es inofensivo porque el error RDMSR se maneja con elegancia, pero da como resultado un WARN_ON(). Agregue la comprobaci\u00f3n de capacidad faltante para evitar esto."
    }
  ],
  "id": "CVE-2024-44948",
  "lastModified": "2024-09-05T12:53:21.110",
  "metrics": {},
  "published": "2024-09-04T19:15:29.950",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/06c1de44d378ec5439db17bf476507d68589bfe9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/34f36e6ee5bd7eff8b2adcd9fcaef369f752d82e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/388f1c954019f253a8383f7eb733f38d541e10b6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/450b6b22acdaac67a18eaf5ed498421ffcf10051"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8a90d3fc7c24608548d3a750671f9dac21d1a462"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8aa79dfb216b865e96ff890bc4ea71650f9bc8d7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/919f18f961c03d6694aa726c514184f2311a4614"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ca7d00c5656d1791e28369919e3e10febe9c3b16"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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