2.3
CWE
399 416
Advisory Published
CVE Published
Updated

CVE-2013-4377: Use After Free

First published: Thu Sep 26 2013(Updated: )

A dangling pointer access flaw was found in the way qemu handled hot-unplugging virtio devices. This flaw was introduced by virtio refactoring and exists in the virtio-pci implementation. When the virtio-blk-pci device is deleted, the virtio-blk-device is removed first (removal is done in post-order). Later, the virtio-blk-device is accessed again, but proxy-&gt;vdev-&gt;vq is no longer valid (a dangling pointer) and kvm_set_ioeventfd_pio fails. A privileged guest user could use this flaw to crash the qemu process on the host system, causing a denial of service to it and any other running virtual machines. Patches are available at <a href="http://thread.gmane.org/gmane.comp.emulators.qemu/234440">http://thread.gmane.org/gmane.comp.emulators.qemu/234440</a> Acknowledgements: This issue was discovered by Sibiao Luo of Red Hat.

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
QEMU qemu=1.4.0
QEMU qemu=1.4.1
QEMU qemu=1.4.2
QEMU qemu=1.5.0
QEMU qemu=1.5.0-rc1
QEMU qemu=1.5.0-rc2
QEMU qemu=1.5.0-rc3
QEMU qemu=1.5.1
QEMU qemu=1.5.2
QEMU qemu=1.5.3
QEMU qemu=1.6.0
QEMU qemu=1.6.0-rc1
QEMU qemu=1.6.0-rc2
QEMU qemu=1.6.0-rc3

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