CVE catalog

CVE-2017-8900

lightdm: CVE-2017-8900

Severity: Medium · CVSS 6.8CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: May 11, 2017, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.42% · Oct 27, 2026

LightDM through 1.22.0, when systemd is used in Ubuntu 16.10 and 17.x, allows physically proximate attackers to bypass intended AppArmor restrictions and visit the home directories of arbitrary users by establishing a guest session.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	lightdm	sid	`1.33.1-4`	not affected
Debian	lightdm	forky	`1.33.1-4`	not affected
Debian	lightdm	trixie	`1.32.0-6`	not affected
Debian	lightdm	bookworm	`1.26.0-8`	not affected

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	lightdm	source	sid	`Not affected`	unimportant	Not reported	Not reported
Debian	lightdm	source	forky	`Not affected`	unimportant	Not reported	Not reported
Debian	lightdm	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	lightdm	source	bookworm	`Not affected`	unimportant	Not reported	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[gir1.2-lightdm-1]Not affected
Source package: [lightdm]
Details (2)
- 1.26.0-8 · amd64 · bookworm
  Not affected
  dsa · lightdm · debian · bookworm
- 1.26.0-8 · arm64 · bookworm
  Not affected
  dsa · lightdm · debian · bookworm
[liblightdm-gobject-1-0]Not affected
Source package: [lightdm]
Details (2)
- 1.26.0-8 · amd64 · bookworm
  Not affected
  dsa · lightdm · debian · bookworm
- 1.26.0-8 · arm64 · bookworm
  Not affected
  dsa · lightdm · debian · bookworm
[liblightdm-gobject-dev]Not affected
Source package: [lightdm]
Details (2)
- 1.26.0-8 · amd64 · bookworm
  Not affected
  dsa · lightdm · debian · bookworm
- 1.26.0-8 · arm64 · bookworm
  Not affected
  dsa · lightdm · debian · bookworm
[liblightdm-qt5-3-0]Not affected
Source package: [lightdm]
Details (2)
- 1.26.0-8 · amd64 · bookworm
  Not affected
  dsa · lightdm · debian · bookworm
- 1.26.0-8 · arm64 · bookworm
  Not affected
  dsa · lightdm · debian · bookworm
[liblightdm-qt5-3-dev]Not affected
Source package: [lightdm]
Details (2)
- 1.26.0-8 · amd64 · bookworm
  Not affected
  dsa · lightdm · debian · bookworm
- 1.26.0-8 · arm64 · bookworm
  Not affected
  dsa · lightdm · debian · bookworm
[lightdm]Not affected
Details (2)
- 1.26.0-8 · amd64 · bookworm
  Not affected
  dsa · lightdm · debian · bookworm
- 1.26.0-8 · arm64 · bookworm
  Not affected
  dsa · lightdm · debian · bookworm
[lightdm-vala]Not affected
Source package: [lightdm]
Details (2)
- 1.26.0-8 · amd64 · bookworm
  Not affected
  dsa · lightdm · debian · bookworm
- 1.26.0-8 · arm64 · bookworm
  Not affected
  dsa · lightdm · debian · bookworm

Observed: Oct 23, 2026, 5:31:41 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [Red Hat security advisories and VEX]