CVE-2016-7796

Publication date 13 October 2016

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

The manager_dispatch_notify_fd function in systemd allows local users to cause a denial of service (system hang) via a zero-length message received over a notify socket, which causes an error to be returned and the notification handler to be disabled.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
systemd	17.04 zesty	Not affected
	16.10 yakkety	Not affected
	16.04 LTS xenial	Fixed 229-4ubuntu11
	14.04 LTS trusty	Not affected
	12.04 LTS precise	Not in release

Notes

sbeattie

trusty (and vivid-phone) is not affected as init is upstart there

Severity score breakdown

CVSS version: CVSS v3.0

Base score 5.5 · Medium

Base metrics

Parameter	Value
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality impact	None
Integrity impact	None
Availability impact	High

Scores

Parameter	Value
Base score	5.5 · Medium
Exploitability score	-
Impact score	-

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