CVE-2018-6558

Name: CVE-2018-6558
Creator: NVD / NIST
Published: 2018-08-23T19:29:01.127+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 0.62%

Last modified Jun 17, 2026

CVE-2018-6558 is a vulnerability of currently unknown severity. The pam_fscrypt module in fscrypt before 0.2.4 may incorrectly restore primary and supplementary group IDs to the values associated with the root user, which allows attackers to gain privileges via a successful login through certain applications that use Linux-PAM (aka pam).. EPSS estimates a 0.62% chance of exploitation in the next 30 days.

Description

The pam_fscrypt module in fscrypt before 0.2.4 may incorrectly restore primary and supplementary group IDs to the values associated with the root user, which allows attackers to gain privileges via a successful login through certain applications that use Linux-PAM (aka pam).

Metrics

EPSS Probability

0.62%

45.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Google	Fscrypt	< 0.2.4

References

https://github.com/google/fscrypt/commit/3022c1603d968c22f147b4a2c49c4637dd1be91bPatch, Third Party Advisory
https://github.com/google/fscrypt/commit/315f9b042237200174a1fb99427f74027e191d66Patch, Third Party Advisory
https://github.com/google/fscrypt/issues/77Issue Tracking, Third Party Advisory
https://launchpad.net/bugs/1787548Issue Tracking, Patch, Third Party Advisory
https://github.com/google/fscrypt/commit/3022c1603d968c22f147b4a2c49c4637dd1be91bPatch, Third Party Advisory
https://github.com/google/fscrypt/commit/315f9b042237200174a1fb99427f74027e191d66Patch, Third Party Advisory
https://github.com/google/fscrypt/issues/77Issue Tracking, Third Party Advisory
https://launchpad.net/bugs/1787548Issue Tracking, Patch, Third Party Advisory

Timeline

Published: Aug 23, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-6558?

How severe is CVE-2018-6558?

Severity scoring for CVE-2018-6558 is pending analysis. The EPSS model estimates a 0.62% probability of exploitation in the next 30 days.

How do I fix CVE-2018-6558?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-6558?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST