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CVE-2018-6553

cups: AppArmor cupsd Sandbox Bypass Due to Use of Hard Links

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Severity

Important

Red Hat Product Security

7

CVSS 3.0

Review impact separately from score.

Published · May 9, 2018

Updated · November 22, 2025

Description

An AppArmor sandbox bypass has been discovered in cups due to the use of hard links which are not covered by the AppArmor profile. An attacker could use the hard link, if it exists, to execute the referenced backend without sandbox restrictions.

Statement

This issue did not affect the versions of cups as shipped with Red Hat Enterprise Linux as they did not include support for AppArmor.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.0 · 7
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-270 · Privilege Context Switching Error