In the Linux kernel, the following vulnerability has been resolved:
kvm: LAPIC: Restore guard to prevent illegal APIC register access
Per the SDM, “any access that touches bytes 4 through 15 of an APIC
register may cause undefined behavior and must not be executed.”
Worse, such an access in kvm_lapic_reg_read can result in a leak of
kernel stack contents. Prior to commit 01402cf81051 (“kvm: LAPIC:
write down valid APIC registers”), such an access was explicitly
disallowed. Restore the guard that was removed in that commit.
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"arch/x86/kvm/lapic.c"
],
"versions": [
{
"version": "01402cf81051",
"lessThan": "bf99ea52970c",
"status": "affected",
"versionType": "git"
},
{
"version": "01402cf81051",
"lessThan": "018685461a5b",
"status": "affected",
"versionType": "git"
},
{
"version": "01402cf81051",
"lessThan": "a2aff09807fb",
"status": "affected",
"versionType": "git"
},
{
"version": "01402cf81051",
"lessThan": "218bf772bddd",
"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/lapic.c"
],
"versions": [
{
"version": "5.3",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.3",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.4.128",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.10.46",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.12.13",
"lessThanOrEqual": "5.12.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.13",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]