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
02 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
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 0.37% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 30.8% of scored records. A rank, not a probability.
- NVD base score
- 6.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Low. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2016-05-25 15:00Z10 YR AGO
- Last updated
- 2024-08-06 00:17Z2 YR AGO
- Reserved
- 2016-04-14
- Assigning CNA
- redhat
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- CWE-200Exposure of Sensitive Information to an Unauthorized ActorClass
- Data version
- 5.1
- Document digest
- 018611766ee3225c4f4bc6ff1dd48da8599edd325cbd8430c6c71a9a07f8f5d0
05 Affected products
06 References
- git.qemu.orghttp://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=691a02e2ce0c413236a78dee6f2651c937b09fb0
- bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=1313686
- lists.gnu.org[qemu-devel] 20160407 [Qemu-devel] [PATCH] i386: kvmvapic: initialise imm32 variablehttps://lists.gnu.org/archive/html/qemu-devel/2016-04/msg01106.html
- www.securityfocus.com86067http://www.securityfocus.com/bid/86067
- lists.gnu.org[qemu-devel] 20160407 Re: [Qemu-devel] [PATCH] i386: kvmvapic: initialise imm32 variablehttps://lists.gnu.org/archive/html/qemu-devel/2016-04/msg01118.html
- access.redhat.comRHSA-2017:2392https://access.redhat.com/errata/RHSA-2017:2392
- security.gentoo.orgGLSA-201609-01https://security.gentoo.org/glsa/201609-01
- www.ubuntu.comUSN-2974-1http://www.ubuntu.com/usn/USN-2974-1
- lists.debian.org[debian-lts-announce] 20181130 [SECURITY] [DLA 1599-1] qemu security updatehttps://lists.debian.org/debian-lts-announce/2018/11/msg00038.html
- access.redhat.comRHSA-2017:2408https://access.redhat.com/errata/RHSA-2017:2408
- access.redhat.comRHSA-2017:1856https://access.redhat.com/errata/RHSA-2017:1856
07 Fixed in
Debian 12
- qemu Fixed in 1:2.6+dfsg-2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- qemu Fixed in 1:2.6+dfsg-2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- qemu Fixed in 1:2.6+dfsg-2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 14.04 LTS
- qemu Fixed in 2.0.0+dfsg-2ubuntu1.24
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- qemu Fixed in 1:2.5+dfsg-5ubuntu10.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.