fkie_cve-2022-49562
Vulnerability from fkie_nvd
Published
2025-02-26 07:01
Modified
2025-02-26 07:01
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
KVM: x86: Use __try_cmpxchg_user() to update guest PTE A/D bits
Use the recently introduced __try_cmpxchg_user() to update guest PTE A/D
bits instead of mapping the PTE into kernel address space. The VM_PFNMAP
path is broken as it assumes that vm_pgoff is the base pfn of the mapped
VMA range, which is conceptually wrong as vm_pgoff is the offset relative
to the file and has nothing to do with the pfn. The horrific hack worked
for the original use case (backing guest memory with /dev/mem), but leads
to accessing "random" pfns for pretty much any other VM_PFNMAP case.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Use __try_cmpxchg_user() to update guest PTE A/D bits\n\nUse the recently introduced __try_cmpxchg_user() to update guest PTE A/D\nbits instead of mapping the PTE into kernel address space. The VM_PFNMAP\npath is broken as it assumes that vm_pgoff is the base pfn of the mapped\nVMA range, which is conceptually wrong as vm_pgoff is the offset relative\nto the file and has nothing to do with the pfn. The horrific hack worked\nfor the original use case (backing guest memory with /dev/mem), but leads\nto accessing \"random\" pfns for pretty much any other VM_PFNMAP case."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: x86: Use __try_cmpxchg_user() para actualizar los bits A/D de la PTE invitada Use la recientemente introducida __try_cmpxchg_user() para actualizar los bits A/D de la PTE invitada en lugar de mapear la PTE en el espacio de direcciones del kernel. La ruta VM_PFNMAP est\u00e1 rota ya que asume que vm_pgoff es la pfn base del rango VMA mapeado, lo cual es conceptualmente incorrecto ya que vm_pgoff es el desplazamiento relativo al archivo y no tiene nada que ver con la pfn. El horrible hack funcion\u00f3 para el caso de uso original (respaldar la memoria invitada con /dev/mem), pero conduce al acceso a pfn \"aleatorios\" para pr\u00e1cticamente cualquier otro caso VM_PFNMAP."
}
],
"id": "CVE-2022-49562",
"lastModified": "2025-02-26T07:01:31.970",
"metrics": {},
"published": "2025-02-26T07:01:31.970",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/38b888911e8dc89b89d8147cfb1d2dbe6373bf78"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/8089e5e1d18402fb8152d6b6815450a36fffa9b0"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/f122dfe4476890d60b8c679128cd2259ec96a24c"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Awaiting Analysis"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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