CVE-2022-49556 (GCVE-0-2022-49556)
Vulnerability from cvelistv5
Published
2025-02-26 02:14
Modified
2025-05-04 08:40
Severity ?
VLAI Severity ?
EPSS score ?
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 | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ▼ | Linux | Linux |
Version: eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5 Version: eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5 Version: eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5 Version: eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5 Version: eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5 |
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|
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{
"containers": {
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"programFiles": [
"arch/x86/kvm/svm/sev.c"
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"versions": [
{
"status": "affected",
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"cpeApplicability": [
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"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."
}
],
"providerMetadata": {
"dateUpdated": "2025-05-04T08:40:28.652Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
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"url": "https://git.kernel.org/stable/c/401bef1f95de92c3a8c6eece46e02fa88d7285ee"
},
{
"url": "https://git.kernel.org/stable/c/d8fdb4b24097472ff6b3c0559448200d420b1418"
},
{
"url": "https://git.kernel.org/stable/c/bbdcc644b59e01e98c68894a9fab42b9687f42b0"
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{
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},
{
"url": "https://git.kernel.org/stable/c/d22d2474e3953996f03528b84b7f52cc26a39403"
}
],
"title": "KVM: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak",
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"cveId": "CVE-2022-49556",
"datePublished": "2025-02-26T02:14:03.630Z",
"dateReserved": "2025-02-26T02:08:31.590Z",
"dateUpdated": "2025-05-04T08:40:28.652Z",
"state": "PUBLISHED"
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