CVE-2018-15746

Publication date 29 August 2018

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

qemu-seccomp.c in QEMU might allow local OS guest users to cause a denial of service (guest crash) by leveraging mishandling of the seccomp policy for threads other than the main thread.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
qemu	18.10 cosmic	Fixed 1:2.12+dfsg-3ubuntu5
	18.04 LTS bionic	Fixed 1:2.11+dfsg-1ubuntu7.6
	16.04 LTS xenial	Ignored
	14.04 LTS trusty	Ignored
qemu-kvm	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release

Notes

mdeslaur

we will not be fixing this issue on trusty and xenial. trust lacks a recent kernel and seccomp version and xenial uses a whitelist based approach instead of a blacklist. Fixing this in xenial is likely to cause regressions.

Patch details

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

Package	Patch details
qemu	Upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=70dfabeaa79ba4d7a3b699abe1a047c8012db114

Severity score breakdown

Parameter	Value
Base score	5.5 · Medium
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H