CVE-2018-18021 Detail

Current 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.


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score:  7.1 HIGH
Vector:  CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H


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Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2a3f93459d689d990b3ecfbe782fec89b97d3279 Patch 
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d26c25a9d19b5976b319af528886f89cf455692d Patch 
http://www.securityfocus.com/bid/105550 Third Party Advisory  VDB Entry 
https://access.redhat.com/errata/RHSA-2018:3656 Third Party Advisory 
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.12 Patch 
https://github.com/torvalds/linux/commit/2a3f93459d689d990b3ecfbe782fec89b97d3279 Patch 
https://github.com/torvalds/linux/commit/d26c25a9d19b5976b319af528886f89cf455692d Patch 
https://usn.ubuntu.com/3821-1/ Third Party Advisory 
https://usn.ubuntu.com/3821-2/ Third Party Advisory 
https://usn.ubuntu.com/3931-1/
https://usn.ubuntu.com/3931-2/
https://www.debian.org/security/2018/dsa-4313 Third Party Advisory 
https://www.openwall.com/lists/oss-security/2018/10/02/2 Mailing List  Patch  Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-20 Improper Input Validation cwe source acceptance level NIST  

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Change History

6 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2018-18021
NVD Published Date:
10/07/2018
NVD Last Modified:
04/02/2019
Source:
MITRE