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redhatcveRedhat.comRH:CVE-2021-47389
HistoryMay 22, 2024 - 10:20 a.m.

CVE-2021-47389

2024-05-2210:20:35
redhat.com
access.redhat.com
3
linux kernel
kvm
svm
sev_decommission
sev_receive_start
amd's sev api
receive_start
decommission
firmware
memory leakage
guest context

6.6 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

9.0%

In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: fix missing sev_decommission in sev_receive_start DECOMMISSION the current SEV context if binding an ASID fails after RECEIVE_START. Per AMD’s SEV API, RECEIVE_START generates a new guest context and thus needs to be paired with DECOMMISSION: The RECEIVE_START command is the only command other than the LAUNCH_START command that generates a new guest context and guest handle. The missing DECOMMISSION can result in subsequent SEV launch failures, as the firmware leaks memory and might not able to allocate more SEV guest contexts in the future. Note, LAUNCH_START suffered the same bug, but was previously fixed by commit 934002cd660b (“KVM: SVM: Call SEV Guest Decommission if ASID binding fails”).

6.6 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

9.0%