CVE-2015-8308: LXDM before 0.5.2 did not start X server with -auth, which allows local users to bypass authentication with X

Q: How do I fix CVE-2015-8308?

lxdm: upgrade to newer than 0.5.1. Exact commands for each OS are on this page.

Q: Is CVE-2015-8308 being exploited?

CVE-2015-8308 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2015-8308 affect?

CVE-2015-8308 affects lxdm. Severity is high (CVSS 7.8). LXDM before 0.5.2 did not start X server with -auth, which allows local users to bypass authentication with X connections.

Routine

HIGH 7.8UPGRADE

CVE-2015-8308 is a high-severity flaw (CVSS 7.8) affecting lxdm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

LXDM before 0.5.2 did not start X server with -auth, which allows local users to bypass authentication with X connections.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 67%)
CISA exploited list	No
Weakness	CWE-287
Published	2017-08-24
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: lxdm project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2017-08-24 20:29 UTCPublished CVE record published
2026-06-17 00:34 UTCUpdated Record last modified

lxdm project lxdm UPGRADE

Affected: <= 0.5.1

Fixed in: newer than 0.5.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy lxdm || rpm -q lxdm || lxdm --version

2. UPGRADE to newer than 0.5.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade lxdm

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade lxdm

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2015-8308?

lxdm: upgrade to newer than 0.5.1. Exact commands for each OS are on this page.

Is CVE-2015-8308 being exploited?

CVE-2015-8308 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2015-8308 affect?

CVE-2015-8308 affects lxdm. Severity is high (CVSS 7.8). LXDM before 0.5.2 did not start X server with -auth, which allows local users to bypass authentication with X connections.

How urgent is CVE-2015-8308?

Priority 36/100. High severity

References

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