In the Linux kernel, the following vulnerability has been resolved:
KVM: SVM: Use online_vcpus, not created_vcpus, to iterate over vCPUs
Use the kvm_for_each_vcpu() helper to iterate over vCPUs when encrypting
VMSAs for SEV, which effectively switches to use online_vcpus instead of
created_vcpus. This fixes a possible null-pointer dereference as
created_vcpus does not guarantee a vCPU exists, since it is updated at
the very beginning of KVM_CREATE_VCPU. created_vcpus exists to allow the
bulk of vCPU creation to run in parallel, while still correctly
restricting the max number of max vCPUs.
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"arch/x86/kvm/svm/sev.c"
],
"versions": [
{
"version": "ad73109ae7ec",
"lessThan": "bd0cced2ae93",
"status": "affected",
"versionType": "git"
},
{
"version": "ad73109ae7ec",
"lessThan": "ba7bf5d6336a",
"status": "affected",
"versionType": "git"
},
{
"version": "ad73109ae7ec",
"lessThan": "c36b16d29f3a",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"arch/x86/kvm/svm/sev.c"
],
"versions": [
{
"version": "5.11",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.11",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.11.21",
"lessThanOrEqual": "5.11.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.12.4",
"lessThanOrEqual": "5.12.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.13",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]