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A flaw was found in the way RTAS handled memory accesses in userspace to kernel communication. On a locked down (usually due to Secure Boot) guest system running on top of PowerVM or KVM hypervisors (pseries platform) a root like local user could use this flaw to further increase their privileges to that of a running kernel.

🗓️ 23 Dec 2020 08:00:00Reported by MicrosoftType 
mscve
 mscve🔗 msrc.microsoft.com👁 2 Views

RunTime Abstraction Software memory flaw enables local privilege escalation to the kernel on locked down virtualization.

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Vulners
Node
microsoftcm1_kernel_5.4.91-1Range<5.4.91-1

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23 Dec 2020 08:00Current
8.3High risk
Vulners AI Score8.3
CVSS 3.16.7
CVSS 27.2
EPSS0.00027
RunTime Abstraction SoftwareMemory access flawPrivilege escalationKernel accessLocked down virtualizationPower Virtualization
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