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prionPRIOn knowledge basePRION:CVE-2022-26363
HistoryJun 09, 2022 - 5:15 p.m.

Design/Logic Flaw

2022-06-0917:15:00
PRIOn knowledge base
www.prio-n.com
6
x86 pv
logic flaw
incorrect safety
cpu cache
non-coherent mappings
xen
security issue

AI Score

6.6

Confidence

High

EPSS

0.001

Percentile

27.5%

x86 pv: Insufficient care with non-coherent mappings T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Xen maintains a type reference count for pages, in addition to a regular reference count. This scheme is used to maintain invariants required for Xen’s safety, e.g. PV guests may not have direct writeable access to pagetables; updates need auditing by Xen. Unfortunately, Xen’s safety logic doesn’t account for CPU-induced cache non-coherency; cases where the CPU can cause the content of the cache to be different to the content in main memory. In such cases, Xen’s safety logic can incorrectly conclude that the contents of a page is safe.

CPENameOperatorVersion
debian_linuxeq11.0
fedoraeq35
fedoraeq36

AI Score

6.6

Confidence

High

EPSS

0.001

Percentile

27.5%