Public Date:
1655925: CVE-2018-19788 polkit: Improper handling of user with uid > INT_MAX leading to authentication bypass

The MITRE CVE dictionary describes this issue as:

A flaw was found in PolicyKit (aka polkit) 0.115 that allows a user with a uid greater than INT_MAX to successfully execute any systemctl command.

Find out more about CVE-2018-19788 from the MITRE CVE dictionary dictionary and NIST NVD.


This issue affects the versions of polkit as shipped with Red Hat Enterprise Linux 6 and 7.

Red Hat Enterprise Linux 6 is now in Maintenance Support 2 Phase of the support and maintenance life cycle. This has been rated as having a security impact of Moderate, and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle:

This issue affects the versions of polkit as shipped with Red Hat Virtualization 4. System users beyond those created at installation time are typically not used in Red Hat Virtualization Hypervisor or Management Appliance hosts, nor is there any opportunity to accidentally or maliciously create a user with a dangerous uid/gid on these systems under normal operation. For Red Hat Virtualization, this vulnerability has been rated as having a security impact of Low. Future updates may address this issue.

CVSS v3 metrics

CVSS3 Base Score 7
CVSS3 Base Metrics CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity High
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity Impact High
Availability Impact High

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux 7 (polkit) RHSA-2019:2046 2019-08-06

Affected Packages State

Platform Package State
Red Hat Virtualization 4 rhvm-appliance Will not fix
Red Hat Virtualization 4 redhat-virtualization-host Will not fix
Red Hat Enterprise Linux 8 polkit Not affected
Red Hat Enterprise Linux 6 polkit Will not fix
Unless explicitly stated as not affected, all previous versions of packages in any minor update stream of a product listed here should be assumed vulnerable, although may not have been subject to full analysis.


Do not allow negative UIDs or UIDs greater than 2147483646.

Last Modified

CVE description copyright © 2017, The MITRE Corporation