The ioapic_deliver function in virt/kvm/ioapic.c in the Linux kernel through 3.14.1 does not properly validate the kvm_irq_delivery_to_apic return value, which allows guest OS users to cause a denial of service (host OS crash) via a crafted entry in the redirection table of an I/O APIC. NOTE: the affected code was moved to the ioapic_service function before the vulnerability was announced.
CVSS Severity (version 2.0):
Impact Subscore: 6.9
Exploitability Subscore: 5.1
CVSS Version 2 Metrics:
Access Vector: Local network exploitable
Access Complexity: Low
Authentication: Required to exploit
Impact Type: Allows disruption of service
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[oss-security] 20140407 CVE-2014-0155 -- kernel: kvm: BUG caused by invalid entry in guest ioapic redirection table
Patch Information; Exploit