Quick emulator(Qemu) built with the Cirrus CLGD 54xx VGA Emulator support is vulnerable to a divide by zero issue. It could occur while copying VGA data when cirrus graphics mode was set to be VGA. A privileged user inside guest could use this flaw to crash the Qemu process instance on the host, resulting in DoS. Upstream patch -------------- -> https://lists.gnu.org/archive/html/qemu-devel/2016-10/msg03968.html Reference: ---------- -> http://www.openwall.com/lists/oss-security/2016/12/08/9
Acknowledgments: Name: Qinghao Tang (Qihoo 360), Li Qiang (Qihoo 360), Jiangxin (Huawei Inc.)
Created xen tracking bugs for this issue: Affects: fedora-all [bug 1399055]
Created qemu tracking bugs for this issue: Affects: fedora-all [bug 1399054]
commit 4299b90e9ba9ce5ca9024572804ba751aa1a7e70 Author: Prasad J Pandit <pjp> Date: Tue Oct 18 13:15:17 2016 +0530 display: cirrus: check vga bits per pixel(bpp) value
This issue has been addressed in the following products: Red Hat OpenStack Platform 10.0 (Newton) Red Hat OpenStack Platform 11.0 (Ocata) Red Hat Enterprise Linux OpenStack Platform 6.0 (Juno) for RHEL 7 Red Hat Enterprise Linux OpenStack Platform 7.0 (Kilo) for RHEL 7 Red Hat OpenStack Platform 8.0 (Liberty) Red Hat OpenStack Platform 9.0 (Mitaka) Via RHSA-2017:2408 https://access.redhat.com/errata/RHSA-2017:2408
This issue has been addressed in the following products: RHEV 4.X RHEV-H and Agents for RHEL-7 Via RHSA-2017:2392 https://access.redhat.com/errata/RHSA-2017:2392