The cpu_physical_memory_write_rom_internal function in exec.c in QEMU (aka Quick Emulator) does not properly skip MMIO regions, which allows local privileged guest users to cause a denial of service (guest crash) via unspecified vectors.
git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=b242e0e0e2969c044a318e56f7988bbd84de1f63
rhn.redhat.com/errata/RHSA-2016-2670.html
rhn.redhat.com/errata/RHSA-2016-2671.html
rhn.redhat.com/errata/RHSA-2016-2704.html
rhn.redhat.com/errata/RHSA-2016-2705.html
rhn.redhat.com/errata/RHSA-2016-2706.html
www.openwall.com/lists/oss-security/2016/03/01/1
www.openwall.com/lists/oss-security/2016/03/01/10
bugzilla.redhat.com/show_bug.cgi?id=1300771