CVE-2018-18021

Advisory lineage Upstream: 0 Downstream: 9
Modified
Published: 07 Oct 2018, 06:00
Last modified:05 Aug 2024, 11:01

Vulnerability Summary

Overall Risk (default)
medium
28/100
CVSS Score
7.1 HIGH
v3.0 (nvd)
EPSS Score
0.09% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

07 Oct 2018, 06:00
Published
Vulnerability first disclosed
05 Aug 2024, 11:01
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
  • v2.0•LOW•Score: 3.6AV:L/AC:L/Au:N/C:N/I:P/A:P

EPSS Trends

Current EPSS score: 0.09%• Percentile: 25%

Techniques & Countermeasures

  • CWE-20•Improper Input Validation

    The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Affected Systems

  • canonical•ubuntu_linux

    14.04 | 16.04

  • debian•debian_linux

    9.0

  • linux•linux_kernel

    < 4.18.12

References (13)