Vulnerability in Qemu
CVE-2016-4020
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…
EPSS: 0.001 (24.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
Affected products
- Qemu
- Canonical Ubuntu_linux — versions 12.04, 14.04, 15.10
- Debian Debian_linux — versions 8.0
- Redhat Enterprise_linux — versions 7.0
- Redhat Enterprise_linux_desktop — versions 7.0
- Redhat Enterprise_linux_eus — versions 7.4, 7.5, 7.6
- Redhat Enterprise_linux_server — versions 7.0
- Redhat Enterprise_linux_server_aus — versions 7.4, 7.6, 7.7
- Redhat Enterprise_linux_server_tus — versions 7.6, 7.7
- Redhat Enterprise_linux_workstation — versions 7.0
References
- secalert@redhat.com (x_refsource_CONFIRM)
- secalert@redhat.com (x_refsource_CONFIRM, Third Party Advisory, Issue Tracking)
- [qemu-devel] 20160407 [Qemu-devel] [PATCH] i386: kvmvapic: initialise imm32 variable (mailing-list, x_refsource_MLIST, Patch, Third Party Advisory)
- 86067 (Third Party Advisory, VDB Entry, vdb-entry, x_refsource_BID)
- [qemu-devel] 20160407 Re: [Qemu-devel] [PATCH] i386: kvmvapic: initialise imm32 variable (mailing-list, x_refsource_MLIST, Patch, Third Party Advisory)
- RHSA-2017:2392 (x_refsource_REDHAT, vendor-advisory, Third Party Advisory)
- GLSA-201609-01 (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)
- USN-2974-1 (x_refsource_UBUNTU, vendor-advisory, Third Party Advisory)
- [debian-lts-announce] 20181130 [SECURITY] [DLA 1599-1] qemu security update (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- RHSA-2017:2408 (x_refsource_REDHAT, vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2016-4020?
- CVE-2016-4020 is a medium-severity vulnerability in Qemu. CVSS score: 6.5/10. Published 2016-05-25.
- How severe is CVE-2016-4020?
- Medium severity. CVSS v3 base score is 6.5 out of 10.