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CVE-2019-18422 PUBLISHED

An issue was discovered in Xen through 4.12.x allowing ARM guest OS users to cause a denial of service or gain privileges by leveraging the erroneous enabling of interrupts. Interrupts are unconditionally unmasked in exception handlers. When an exception occurs on an ARM system which is handled without changing processor level, some interrupts are unconditionally enabled during exception entry. So exceptions which occur when interrupts are masked will effectively unmask the interrupts. A malicious guest might contrive to arrange for critical Xen code to run with interrupts erroneously enabled. This could lead to data corruption, denial of service, or possibly even privilege escalation. However a precise attack technique has not been identified.

EPSS 3.47% · 87.4th percentile

Risk Scores

EPSS Score
3.47%
87.4th percentile

Affected Products

VendorProductVersions
Ubuntu:16.04:LTSxen0, 4.5.1-0ubuntu1, 4.5.1-0ubuntu2
Ubuntu:18.04:LTSxen0, 4.9.0-0ubuntu3, 4.9.0-0ubuntu4

Timeline

References

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