The load_segment_descriptor implementation in arch/x86/kvm/emulate.c in the Linux kernel before 4.9.5 improperly emulates a "MOV SS, NULL s…

published 2017-02-06 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-11763

cvss: 8.4; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits: 0; none known

The load_segment_descriptor implementation in arch/x86/kvm/emulate.c in the Linux kernel before 4.9.5 improperly emulates a "MOV SS, NULL selector" instruction, which allows guest OS users to cause a denial of service (guest OS crash) or gain guest OS privileges via a crafted application.

Patch / fix

distros 5 links 3

debian ubuntu red hat suse arch linux

linux Debian 14, Debian 13, Debian 12 4.9.6-1

debian advisories DEBIAN-CVE-2017-2583

linux Ubuntu 14.04 LTS 3.13.0-157.207
linux Ubuntu 16.04 LTS 4.4.0-63.84
linux-aws Ubuntu 16.04 LTS 4.4.0-1003.12
linux-hwe Ubuntu 16.04 LTS 4.10.0-32.36~16.04.1
linux-raspi2 Ubuntu 16.04 LTS 4.4.0-1044.51
linux-lts-xenial Ubuntu 14.04 LTS 4.4.0-63.84~14.04.2
linux-snapdragon Ubuntu 16.04 LTS 4.4.0-1047.51

ubuntu advisories UBUNTU-CVE-2017-2583

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 3.10.0-514.26.1.rt56.442.el7
kernel-rt-kvm RHEL 7 EXTRAS_RT 3.10.0-514.26.1.rt56.442.el7
kernel-rt-trace RHEL 7 EXTRAS_RT 3.10.0-514.26.1.rt56.442.el7
kernel-rt-debug-kvm RHEL 7 EXTRAS_RT 3.10.0-514.26.1.rt56.442.el7
kernel-rt-trace-kvm RHEL 7 EXTRAS_RT 3.10.0-514.26.1.rt56.442.el7
kernel-rt-debuginfo-common-x86_64 RHEL 7 EXTRAS_RT 3.10.0-514.26.1.rt56.442.el7
kernel RHEL 7 3.10.0-514.26.1.el7
perf RHEL 7 3.10.0-514.26.1.el7

red hat advisories RHSA-2017:1616 RHSA-2017:1615

kernel-rt SLE Real Time 12 SP2 4.4.74-7.10.1
kernel-syms-rt SLE Real Time 12 SP2 4.4.74-7.10.1
kernel-rt_debug SLE Real Time 12 SP2 4.4.74-7.10.1
kernel-source-rt SLE Real Time 12 SP2 4.4.74-7.10.1
kernel-syms SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +1 more 4.4.49-92.11.1
kernel-source SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +1 more 4.4.49-92.11.1
kernel-default SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +3 more 4.4.49-92.11.1
kernel-obs-build SLE Software Development Kit 12 SP2 4.4.49-92.11.1

suse advisories SUSE-SU-2017:1990-1 SUSE-SU-2017:0575-1 SUSE-SU-2017:0471-1 SUSE-SU-2017:0464-1 SUSE-SU-2017:0407-1

linux Arch Linux 4.9.5-1
linux-lts Arch Linux 4.4.44-1
linux-zen Arch Linux 4.9.5-1

arch linux advisories AVG-149 AVG-150 AVG-151

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-2017-2583 updated 2026-11-05 cvss 6.4

Kernel: Kvm: vmx/svm potential privilege escalation inside guest

Red Hat Enterprise Linux Client (v. 7) perf 3.10.0-514.26.1.el7, kernel 3.10.0-514.26.1.el7, python-perf 3.10.0-514.26.1.el7, kernel-tools 3.10.0-514.26.1.el7, kernel-tools-libs 3.10.0-514.26.1.el7, kernel-abi-whitelists 3.10.0-514.26.1.el7, +1 more Red Hat Enterprise Linux Client Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-514.26.1.el7 Red Hat Enterprise Linux ComputeNode (v. 7) perf 3.10.0-514.26.1.el7, kernel 3.10.0-514.26.1.el7, python-perf 3.10.0-514.26.1.el7, kernel-tools 3.10.0-514.26.1.el7, kernel-tools-libs 3.10.0-514.26.1.el7, kernel-abi-whitelists 3.10.0-514.26.1.el7, +1 more Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-514.26.1.el7
fixed: vendor fix RHSA-2017:1615
Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt 3.10.0-514.26.1.rt56.442.el7, kernel-rt-kvm 3.10.0-514.26.1.rt56.442.el7, kernel-rt-trace 3.10.0-514.26.1.rt56.442.el7, kernel-rt-debug-kvm 3.10.0-514.26.1.rt56.442.el7, kernel-rt-trace-kvm 3.10.0-514.26.1.rt56.442.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-514.26.1.rt56.442.el7 Red Hat Enterprise Linux Realtime (v. 7) kernel-rt 3.10.0-514.26.1.rt56.442.el7, kernel-rt-trace 3.10.0-514.26.1.rt56.442.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-514.26.1.rt56.442.el7
fixed: vendor fix RHSA-2017:1616
Red Hat Enterprise Linux Server (v. 7) perf 3.10.0-514.26.1.el7, kernel 3.10.0-514.26.1.el7, python-perf 3.10.0-514.26.1.el7, kernel-kdump 3.10.0-514.26.1.el7, kernel-tools 3.10.0-514.26.1.el7, kernel-tools-libs 3.10.0-514.26.1.el7, +6 more Red Hat Enterprise Linux Server Optional (v. 7) kernel-debuginfo-common-ppc64 3.10.0-514.26.1.el7, kernel-debuginfo-common-x86_64 3.10.0-514.26.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-514.26.1.el7 Red Hat Enterprise Linux Workstation (v. 7) perf 3.10.0-514.26.1.el7, kernel 3.10.0-514.26.1.el7, python-perf 3.10.0-514.26.1.el7, kernel-tools 3.10.0-514.26.1.el7, kernel-tools-libs 3.10.0-514.26.1.el7, kernel-abi-whitelists 3.10.0-514.26.1.el7, +1 more Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-514.26.1.el7
fixed: vendor fix RHSA-2017:1615
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

0.60% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.0	8.4	CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	4.6	AV:L/AC:L/Au:N/C:P/I:P/A:P

Classification

Technology feeds

Linux kernel rss critical rss

References

github.com /torvalds/linux/commit/33ab91103b3415e12457e3104f0e4517ce12d0f3
issue-tracking, patch, third-party-advisory
git.kernel.org /cgit/linux/kernel/git/torvalds/linux.git/commit/?id=33ab91103b3415e12457e3104f0e4517ce12d0f3
issue-tracking, third-party-advisory
bugzilla.redhat.com /show_bug.cgi?id=1414735
issue-tracking, patch
access.redhat.com /errata/RHSA-2017:1615
vendor-advisory
usn.ubuntu.com /3754-1/
vendor-advisory
access.redhat.com /errata/RHSA-2017:1616
vendor-advisory
debian.org /security/2017/dsa-3791
vendor-advisory
kernel.org /pub/linux/kernel/v4.x/ChangeLog-4.9.5
release-notes, vendor-advisory
openwall.com /lists/oss-security/2017/01/19/2
mailing-list, third-party-advisory
securityfocus.com /bid/95673
vdb-entry, third-party-advisory

Sources

CVE List CVE-2017-2583
NVD CVE-2017-2583

Fencer Vulns 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.

Summary