Home/CVE/The patch_instruction function in hw/i386/kvmvapic.c in QEMU does not initialize the imm32 variable, which allows local
CVE

CVE-2016-4020

The patch_instruction function in hw/i386/kvmvapic.c in QEMU does not initialize the imm32 variable, which allows local

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).

MEDIUM · CVSS 6.5 EPSS 0.00085
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules2 YARA rules0
▤

Affected Products & Versions

11
qemu<= 2.6.2
canonical ubuntu linuxall versions
debian linuxall versions
redhat openstackall versions
redhat enterprise linux desktopall versions
redhat enterprise linux eusall versions
redhat enterprise linux serverall versions
redhat enterprise linux server ausall versions
◈

Sigma Hunt Rules

2
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productmediumPotentially Suspicious Usage Of Qemu
productmediumPowershell Detect Virtualization Environment
▣

Scoring & Timeline

6.5
MEDIUM · CVSS v3.1 · secalert@redhat.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD25 May 2016 · 03:59 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
⚑

Vendor Advisories

13
suse-csafopenSUSE-SU-2024:10233-1
suse-csafopenSUSE-SU-2024:10285-1
rhsaRHSA-2017:2408Moderate
rhsaRHSA-2017:2392Low
rhsaRHSA-2017:1856Moderate
🔗

References & Sources

8
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://git.qemu.org/?p=qemu.git
http://www.securityfocus.com/bid/86067Third Party AdvisoryVDB Entry
http://www.ubuntu.com/usn/USN-2974-1Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1313686Issue TrackingThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/11/msg00038.htmlMailing ListThird Party Advisory
https://lists.gnu.org/archive/html/qemu-devel/2016-04/msg01106.htmlPatchThird Party Advisory
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