How severe is CVE-2018-6558?

CVE-2018-6558 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2018-6558 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-6558?

CVE-2018-6558 affects Google Fscrypt. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-6558?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-6558 published?

CVE-2018-6558 was published on 2018-08-23 and last updated on 2026-06-17.

CVE-2018-6558

CVE-2018-6558 is a medium-severity vulnerability in Google Fscrypt with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.9
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Google Fscrypt
Published: 2018-08-23
Last modified: 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).

Frequently asked questions

What is CVE-2018-6558?: 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).
How severe is CVE-2018-6558?: CVE-2018-6558 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2018-6558 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-6558?: CVE-2018-6558 affects Google Fscrypt. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-6558?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-6558 published?: CVE-2018-6558 was published on 2018-08-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:google:fscrypt:*:*:*:*:*:*:*:*

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