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redhatcveRedhat.comRH:CVE-2021-47255
HistoryMay 23, 2024 - 2:04 p.m.

CVE-2021-47255

2024-05-2314:04:59
redhat.com
access.redhat.com
4
linux kernel
vulnerability
cve-2021-47255
lapic
register access
sdm
undefined behavior
kvm
mitigation

6.2 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

15.5%

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.

6.2 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

15.5%