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Fencer Intel
medium 5.5

CVE-2016-8630 json

The x86_decode_insn function in arch/x86/kvm/emulate.c in the Linux kernel before 4.8.7, when KVM is enabled, allows local users to cause a…

published 2016-11-28 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-9473

cvss
5.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 30%
public exploits
0
none known

Summary

The x86_decode_insn function in arch/x86/kvm/emulate.c in the Linux kernel before 4.8.7, when KVM is enabled, allows local users to cause a denial of service (host OS crash) via a certain use of a ModR/M byte in an undefined instruction.

Patch / fix

  • linux Debian 14, Debian 13, Debian 12 4.8.7-1

debian advisories DEBIAN-CVE-2016-8630

  • linux Ubuntu 16.04 LTS 4.4.0-57.78
  • linux-raspi2 Ubuntu 16.04 LTS 4.4.0-1038.45
  • linux-lts-xenial Ubuntu 14.04 LTS 4.4.0-57.78~14.04.1
  • linux-snapdragon Ubuntu 16.04 LTS 4.4.0-1042.46

ubuntu advisories UBUNTU-CVE-2016-8630

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel-rt RHEL 7 EXTRAS_RT 3.10.0-514.10.2.rt56.435.el7
  • kernel-rt-kvm RHEL 7 EXTRAS_RT 3.10.0-514.10.2.rt56.435.el7
  • kernel-rt-trace RHEL 7 EXTRAS_RT 3.10.0-514.10.2.rt56.435.el7
  • kernel-rt-debug-kvm RHEL 7 EXTRAS_RT 3.10.0-514.10.2.rt56.435.el7
  • kernel-rt-trace-kvm RHEL 7 EXTRAS_RT 3.10.0-514.10.2.rt56.435.el7
  • kernel-rt-debuginfo-common-x86_64 RHEL 7 EXTRAS_RT 3.10.0-514.10.2.rt56.435.el7
  • kernel RHEL 7 3.10.0-514.10.2.el7
  • perf RHEL 7 3.10.0-514.10.2.el7

red hat advisories RHSA-2017:0387RHSA-2017:0386

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-8630 updated cvss 6.2

kernel: kvm: x86: NULL pointer dereference during instruction decode

  • Red Hat Enterprise Linux Client (v. 7) perf 3.10.0-514.10.2.el7, kernel 3.10.0-514.10.2.el7, python-perf 3.10.0-514.10.2.el7, kernel-tools 3.10.0-514.10.2.el7, kernel-tools-libs 3.10.0-514.10.2.el7, kernel-abi-whitelists 3.10.0-514.10.2.el7, +1 more Red Hat Enterprise Linux Client Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-514.10.2.el7 Red Hat Enterprise Linux ComputeNode (v. 7) perf 3.10.0-514.10.2.el7, kernel 3.10.0-514.10.2.el7, python-perf 3.10.0-514.10.2.el7, kernel-tools 3.10.0-514.10.2.el7, kernel-tools-libs 3.10.0-514.10.2.el7, kernel-abi-whitelists 3.10.0-514.10.2.el7, +1 more Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-514.10.2.el7
    fixed: vendor fix RHSA-2017:0386
  • Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt 3.10.0-514.10.2.rt56.435.el7, kernel-rt-kvm 3.10.0-514.10.2.rt56.435.el7, kernel-rt-trace 3.10.0-514.10.2.rt56.435.el7, kernel-rt-debug-kvm 3.10.0-514.10.2.rt56.435.el7, kernel-rt-trace-kvm 3.10.0-514.10.2.rt56.435.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-514.10.2.rt56.435.el7 Red Hat Enterprise Linux Realtime (v. 7) kernel-rt 3.10.0-514.10.2.rt56.435.el7, kernel-rt-trace 3.10.0-514.10.2.rt56.435.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-514.10.2.rt56.435.el7
    fixed: vendor fix RHSA-2017:0387
  • Red Hat Enterprise Linux Server (v. 7) perf 3.10.0-514.10.2.el7, kernel 3.10.0-514.10.2.el7, python-perf 3.10.0-514.10.2.el7, kernel-kdump 3.10.0-514.10.2.el7, kernel-tools 3.10.0-514.10.2.el7, kernel-tools-libs 3.10.0-514.10.2.el7, +6 more Red Hat Enterprise Linux Server Optional (v. 7) kernel-debuginfo-common-ppc64 3.10.0-514.10.2.el7, kernel-debuginfo-common-x86_64 3.10.0-514.10.2.el7, kernel-debuginfo-common-ppc64le 3.10.0-514.10.2.el7 Red Hat Enterprise Linux Workstation (v. 7) perf 3.10.0-514.10.2.el7, kernel 3.10.0-514.10.2.el7, python-perf 3.10.0-514.10.2.el7, kernel-tools 3.10.0-514.10.2.el7, kernel-tools-libs 3.10.0-514.10.2.el7, kernel-abi-whitelists 3.10.0-514.10.2.el7, +1 more Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-514.10.2.el7
    fixed: vendor fix RHSA-2017:0386
  • Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.36% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 5.5 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.9 AV:L/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.