What’s Vulnerable › Vulnerabilities

CVE-2018-6558

• Severity: medium (CVSS 6.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-08-23 · updated 2026-06-17

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).

Affected products

• Google LLC fscrypt: before 0.2.4 — fixed in 0.2.4

How to fix

Upgrade to a fixed version: Google LLC fscrypt 0.2.4. Check the vendor advisory for mitigations.

References

• https://github.com/google/fscrypt/commit/3022c1603d968c22f147b4a2c49c4637dd1be91b
• https://github.com/google/fscrypt/commit/315f9b042237200174a1fb99427f74027e191d66
• https://github.com/google/fscrypt/issues/77
• https://launchpad.net/bugs/1787548
• https://github.com/google/fscrypt/commit/3022c1603d968c22f147b4a2c49c4637dd1be91b
• https://github.com/google/fscrypt/commit/315f9b042237200174a1fb99427f74027e191d66
• https://github.com/google/fscrypt/issues/77
• https://launchpad.net/bugs/1787548

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