CVE-2018-6553
A local attacker could possibly use this issue to escape confinement.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.39%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
The CUPS AppArmor profile incorrectly confined the dnssd backend due to use of hard links. A local attacker could possibly use this issue to escape confinement. This flaw affects versions prior to 2.2.7-1ubuntu2.1 in Ubuntu 18.04 LTS, prior to 2.2.4-7ubuntu3.1 in Ubuntu 17.10, prior to 2.1.3-4ubuntu0.5 in Ubuntu 16.04 LTS, and prior to 1.7.2-0ubuntu1.10 in Ubuntu 14.04 LTS.
- CVSS 3.0
- 8.8 HIGHCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- EPSS
- 0.39% probability · 32th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- cups/cups · canonical/ubuntu linux · debian/debian linux
- Source
- security@ubuntu.com
EPSS 0.4% since 28 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://lists.debian.org/debian-lts-announce/2018/07/msg00014.htmlIssue Tracking, Mailing List, Third Party Advisory
- https://security.gentoo.org/glsa/201908-08
- https://usn.ubuntu.com/usn/usn-3713-1Third Party Advisory
- https://www.debian.org/security/2018/dsa-4243Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/07/msg00014.htmlIssue Tracking, Mailing List, Third Party Advisory
- https://security.gentoo.org/glsa/201908-08
- https://usn.ubuntu.com/usn/usn-3713-1Third Party Advisory
- https://www.debian.org/security/2018/dsa-4243Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.