Use-after-free vulnerability in hw/ide/ahci.c in QEMU, when built with IDE AHCI Emulation support, allows guest OS users to cause a denial of service (instance crash) or possibly execute arbitrary code via an invalid AHCI Native Command Queuing (NCQ) AIO command.
https://security.gentoo.org/glsa/201602-01
http://www.securitytracker.com/id/1034859
http://www.securityfocus.com/bid/80191
http://www.openwall.com/lists/oss-security/2016/01/09/2
http://www.openwall.com/lists/oss-security/2016/01/09/1
http://www.debian.org/security/2016/dsa-3471
http://www.debian.org/security/2016/dsa-3470
http://www.debian.org/security/2016/dsa-3469
http://rhn.redhat.com/errata/RHSA-2016-0088.html
http://rhn.redhat.com/errata/RHSA-2016-0087.html
http://rhn.redhat.com/errata/RHSA-2016-0086.html
http://rhn.redhat.com/errata/RHSA-2016-0084.html
http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=4ab0359a8ae182a7ac5c99609667273167703fab