CVE-2016-4020 The advisory has been revoked - it doesn't affect any version of package qemu-kvm (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU1204-QEMUKVM-621302
- published25 May 2016
- disclosed25 May 2016
Introduced: 25 May 2016
CVE-2016-4020 (opens in a new tab)Amendment
The Ubuntu security team deemed this advisory irrelevant for Ubuntu:12.04.
NVD Description
Note: Versions mentioned in the description apply only to the upstream qemu-kvm package and not the qemu-kvm package as distributed by Ubuntu.
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).
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2016-4020
- http://git.qemu.org/?p=qemu.git;a=commit;h=691a02e2ce0c413236a78dee6f2651c937b09fb0
- https://lists.debian.org/debian-lts-announce/2018/11/msg00038.html
- https://security-tracker.debian.org/tracker/CVE-2016-4020
- https://security.gentoo.org/glsa/201609-01
- 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://bugzilla.redhat.com/show_bug.cgi?id=1313686
- https://access.redhat.com/errata/RHSA-2017:1856
- https://access.redhat.com/errata/RHSA-2017:2392
- https://access.redhat.com/errata/RHSA-2017:2408
- http://www.securityfocus.com/bid/86067
- http://www.ubuntu.com/usn/USN-2974-1
- https://access.redhat.com/security/cve/CVE-2016-4020
- http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=691a02e2ce0c413236a78dee6f2651c937b09fb0