fkie_cve-2022-49556
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: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak
For some sev ioctl interfaces, the length parameter that is passed maybe
less than or equal to SEV_FW_BLOB_MAX_SIZE, but larger than the data
that PSP firmware returns. In this case, kmalloc will allocate memory
that is the size of the input rather than the size of the data.
Since PSP firmware doesn't fully overwrite the allocated buffer, these
sev ioctl interface may return uninitialized kernel slab memory.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak\n\nFor some sev ioctl interfaces, the length parameter that is passed maybe\nless than or equal to SEV_FW_BLOB_MAX_SIZE, but larger than the data\nthat PSP firmware returns. In this case, kmalloc will allocate memory\nthat is the size of the input rather than the size of the data.\nSince PSP firmware doesn\u0027t fully overwrite the allocated buffer, these\nsev ioctl interface may return uninitialized kernel slab memory."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: SVM: Usar kzalloc para interfaces sev ioctl para evitar fugas de datos del kernel Para algunas interfaces sev ioctl, el par\u00e1metro de longitud que se pasa puede ser menor o igual a SEV_FW_BLOB_MAX_SIZE, pero mayor que los datos que devuelve el firmware de PSP. En este caso, kmalloc asignar\u00e1 memoria que sea del tama\u00f1o de la entrada en lugar del tama\u00f1o de los datos. Dado que el firmware de PSP no sobrescribe por completo el b\u00fafer asignado, estas interfaces sev ioctl pueden devolver memoria de losa de kernel no inicializada."
}
],
"id": "CVE-2022-49556",
"lastModified": "2025-02-26T07:01:31.407",
"metrics": {},
"published": "2025-02-26T07:01:31.407",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/401bef1f95de92c3a8c6eece46e02fa88d7285ee"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/57a01725339f9d82b099102ba2751621b1caab93"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/bbdcc644b59e01e98c68894a9fab42b9687f42b0"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/d22d2474e3953996f03528b84b7f52cc26a39403"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/d8fdb4b24097472ff6b3c0559448200d420b1418"
}
],
"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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