CVE-2018-6764

Publication date 7 February 2018

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

util/virlog.c in libvirt does not properly determine the hostname on LXC container startup, which allows local guest OS users to bypass an intended container protection mechanism and execute arbitrary commands via a crafted NSS module.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libvirt	17.10 artful	Fixed 3.6.0-1ubuntu6.3
	16.04 LTS xenial	Fixed 1.3.1-1ubuntu10.19
	14.04 LTS trusty	Not affected

Notes

mdeslaur

introduced by https://libvirt.org/git/?p=libvirt.git;a=commit;h=1ce929603ba8ebc3b0dc4ff39df9619c87723f42

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
libvirt	Upstream: https://libvirt.org/git/?p=libvirt.git;a=commit;h=759b4d1b0fe5f4d84d98b99153dfa7ac289dd167 Upstream: https://libvirt.org/git/?p=libvirt.git;a=commit;h=6ce3acc129bfdbe7fd02bcb8bbe8af6d13903684 Upstream: https://libvirt.org/git/?p=libvirt.git;a=commit;h=c2dc6698c88fb591639e542c8ecb0076c54f3dfb

Severity score breakdown

Parameter	Value
Base score	7.8 · High
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H