CVE-2016-4020

Description

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

https://security.gentoo.org/glsa/201609-01

https://lists.gnu.org/archive/html/qemu-devel/2016-04/msg01118.html

https://lists.gnu.org/archive/html/qemu-devel/2016-04/msg01106.html

https://lists.debian.org/debian-lts-announce/2018/11/msg00038.html

https://bugzilla.redhat.com/show_bug.cgi?id=1313686

https://access.redhat.com/errata/RHSA-2017:2408

https://access.redhat.com/errata/RHSA-2017:2392

https://access.redhat.com/errata/RHSA-2017:1856

http://www.ubuntu.com/usn/USN-2974-1

http://www.securityfocus.com/bid/86067

http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=691a02e2ce0c413236a78dee6f2651c937b09fb0

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3