UBUNTU-CVE-2018-18021

Advisory lineage Upstream: 1 Downstream: 4
Upstream
CVE-2018-18021
Published: 07 Oct 2018, 00:00
Last modified:22 Apr 2026, 11:49

Vulnerability Summary

Overall Risk (default)
medium
28/100
CVSS Score
7.1 HIGH
3.0 (osv_ubuntu)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

07 Oct 2018, 00:00
Published
Vulnerability first disclosed
22 Apr 2026, 11:49
Last Modified
Vulnerability information updated

Description

arch/arm64/kvm/guest.c in KVM in the Linux kernel before 4.18.12 on the arm64 platform mishandles the KVM_SET_ON_REG ioctl. This is exploitable by attackers who can create virtual machines. An attacker can arbitrarily redirect the hypervisor flow of control (with full register control). An attacker can also cause a denial of service (hypervisor panic) via an illegal exception return. This occurs because of insufficient restrictions on userspace access to the core register file, and because PSTATE.M validation does not prevent unintended execution modes.

CVSS Metrics

  • v3.0•HIGH•Score: 7.1CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Affected Systems

  • ubuntu•linux

    all | < 4.4.0-139.165 | < 4.15.0-47.50

  • ubuntu•linux-aws-hwe

    < 4.15.0-1035.37~16.04.1

  • ubuntu•linux-azure-6.11

    all

  • ubuntu•linux-azure-fde

    all

  • ubuntu•linux-fips

    < 4.4.0-1008.10

  • ubuntu•linux-gcp-6.11

    all

  • ubuntu•linux-gke

    all

  • ubuntu•linux-hwe

    < 4.15.0-47.50~16.04.1

  • ubuntu•linux-hwe-6.11

    all

  • ubuntu•linux-intel-iot-realtime

    all

  • ubuntu•linux-lowlatency-hwe-6.11

    all

  • ubuntu•linux-lts-xenial

    < 4.4.0-139.165~14.04.1

  • ubuntu•linux-oracle

    < 4.15.0-1010.12~16.04.1 | < 4.15.0-1010.12

  • ubuntu•linux-raspi-realtime

    all

  • ubuntu•linux-raspi2

    < 4.4.0-1100.108 | < 4.15.0-1033.35 | all

  • ubuntu•linux-realtime

    all

  • ubuntu•linux-riscv

    all | all

  • ubuntu•linux-snapdragon

    < 4.4.0-1104.109

References (14)