oss-security - CVE request -- kernel: kvm: irqchip_in_kernel() and vcpu->arch.apic inconsistency

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Message-ID: <20120329195836.GO780@dhcp-25-225.brq.redhat.com>
Date: Thu, 29 Mar 2012 21:58:36 +0200
From: Petr Matousek <pmatouse@...hat.com>
To: oss-security@...ts.openwall.com
Subject: CVE request -- kernel: kvm: irqchip_in_kernel() and vcpu->arch.apic
 inconsistency

If some vcpus are created before KVM_CREATE_IRQCHIP, then
irqchip_in_kernel() and vcpu->arch.apic will be inconsistent, leading to
potential NULL pointer dereferences.

A unprivileged local user could use this flaw to crash the system.

Upstream fix:
http://git.kernel.org/?p=virt/kvm/kvm.git;a=commit;h=5b40572ed5f0344b9dbee486a17c589ce1abe1a3

References:
http://comments.gmane.org/gmane.comp.emulators.kvm.devel/86217
https://bugzilla.redhat.com/show_bug.cgi?id=808199

Thanks,
-- 
Petr Matousek / Red Hat Security Response Team

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