CVE-2016-4020
First published: Wed Mar 02 2016(Updated: )
The patch_instruction function in hw/i386/kvmvapic.c in QEMU does not initialize the imm32 variable, which allows local guest OS administrators to obtain sensitive information from host stack memory by accessing the Task Priority Register (TPR).
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| QEMU qemu | <=2.6.2 | |
| Canonical Ubuntu Linux | =12.04 | |
| Canonical Ubuntu Linux | =14.04 | |
| Canonical Ubuntu Linux | =15.10 | |
| Canonical Ubuntu Linux | =16.04 | |
| Debian Debian Linux | =8.0 | |
| Redhat Openstack | =6.0 | |
| Redhat Openstack | =7.0 | |
| Redhat Openstack | =8 | |
| Redhat Openstack | =9 | |
| Redhat Openstack | =10 | |
| Redhat Openstack | =11 | |
| Redhat Enterprise Linux Desktop | =7.0 | |
| Redhat Enterprise Linux Eus | =7.4 | |
| Redhat Enterprise Linux Eus | =7.5 | |
| Redhat Enterprise Linux Eus | =7.6 | |
| Redhat Enterprise Linux Eus | =7.7 | |
| Redhat Enterprise Linux Server | =7.0 | |
| Redhat Enterprise Linux Server Aus | =7.4 | |
| Redhat Enterprise Linux Server Aus | =7.6 | |
| Redhat Enterprise Linux Server Aus | =7.7 | |
| Redhat Enterprise Linux Server Tus | =7.6 | |
| Redhat Enterprise Linux Server Tus | =7.7 | |
| Redhat Enterprise Linux Workstation | =7.0 | |
| Redhat Virtualization | =4.0 | |
| Redhat Enterprise Linux | =7.0 |
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Reference Links
- http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=691a02e2ce0c413236a78dee6f2651c937b09fb0
- http://www.securityfocus.com/bid/86067
- http://www.ubuntu.com/usn/USN-2974-1
- https://access.redhat.com/errata/RHSA-2017:1856
- https://access.redhat.com/errata/RHSA-2017:2392
- https://access.redhat.com/errata/RHSA-2017:2408
- https://bugzilla.redhat.com/show_bug.cgi?id=1313686
- https://lists.debian.org/debian-lts-announce/2018/11/msg00038.html
- https://lists.gnu.org/archive/html/qemu-devel/2016-04/msg01106.html
- https://lists.gnu.org/archive/html/qemu-devel/2016-04/msg01118.html
- https://security.gentoo.org/glsa/201609-01
- http://www.openwall.com/lists/oss-security/2016/04/14/3
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1326904
- https://access.redhat.com/support/policy/updates/errata/
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