CVE-2018-18021

 

Published at: - 07-10-2018 08:29

Last modified: - 26-10-2022 01:44

Total changes: - 3

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

 

Verification logic

 

Reference

• https://www.openwall.com/lists/oss-security/2018/10/02/2
• https://github.com/torvalds/linux/commit/d26c25a9d19b5976b319af528886f89cf455692d
• https://github.com/torvalds/linux/commit/2a3f93459d689d990b3ecfbe782fec89b97d3279
• https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.12
• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d26c25a9d19b5976b319af528886f89cf455692d
• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2a3f93459d689d990b3ecfbe782fec89b97d3279
• DSA-4313-Third Party Advisory
• 105550-Third Party Advisory, VDB Entry
• USN-3821-2-Third Party Advisory
• USN-3821-1-Third Party Advisory
• RHSA-2018:3656-Third Party Advisory
• USN-3931-2-
• USN-3931-1-

 

Keywords

NVD

 

CVE-2018-18021

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures