CVE-2017-7471

Publication date 9 July 2018

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

Quick Emulator (Qemu) built with the VirtFS, host directory sharing via Plan 9 File System (9pfs) support, is vulnerable to an improper access control issue. It could occur while accessing files on a shared host directory. A privileged user inside guest could use this flaw to access host file system beyond the shared folder and potentially escalating their privileges on a host.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
qemu	17.04 zesty	Not affected
	16.10 yakkety	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected
	12.04 LTS precise	Not in release
qemu-kvm	17.04 zesty	Not in release
	16.10 yakkety	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
	12.04 LTS precise	Not affected

Notes

ratliff

the conversion to at*() syscalls is not in yakkety/zesty

Severity score breakdown

Parameter	Value
Base score	9.0 · Critical
Attack vector	Adjacent
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Changed
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H