How severe is CVE-2021-47255?

This vulnerability has a severity rating of HIGH with a CVSS score of 7.1 out of 10.

What type of vulnerability is CVE-2021-47255?

This is classified as NVD-CWE-Other, which is a common weakness in software security.

CVE-2021-47255

HIGH Year: 2021

CVSS v3 Score

7.1

High

Weakness Type

NVD-CWE-Other

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Vulnerability Description

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.

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