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TI-2018-04834 Aliases CVE-2018-6558GHSA-qj26-7grj-whg3

The pam_fscrypt module in fscrypt before 0.2.4 may incorrectly restore primary and…

Priority LOW 30Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA and GitHub.

Summary

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).

Why it matters now

EPSS 0.00624 50th percentileScored 2026-11-07
Fix Fixed fscrypt (The fscrypt Project): 0.2.4github.com/google/fscrypt (Go): 0.2.4

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
The fscrypt Projectfscryptbefore 0.2.40.2.4Patch availableCNA
—github.com/google/fscrypt (Go)before 0.2.40.2.4Patch availableGHSA-qj26-7grj-whg3
  • fscrypt VendorThe fscrypt Project Affected before 0.2.4 Fixed in 0.2.4 Patch available CNA
  • github.com/google/fscrypt (Go) Vendor— Affected before 0.2.4 Fixed in 0.2.4 Patch available GHSA-qj26-7grj-whg3

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:google:fscrypt:*:*:*:*:*:*:*:*before 0.2.4VulnerableGoogle
  • cpe:2.3:a:google:fscrypt:*:*:*:*:*:*:*:* Versions before 0.2.4 Vulnerable ·Google

Remediation

  • Fix · CNA fscrypt (The fscrypt Project) Fixed in 0.2.4
  • Fix · GHSA-qj26-7grj-whg3 github.com/google/fscrypt (Go) Fixed in 0.2.4 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2018-6558
  2. 2026-10-03 Alias added: GHSA-qj26-7grj-whg3
  3. 2026-11-04 EPSS moved to the 50th–90th percentile

References

Patch 3

Advisory 2

Other 2

  • TI-2022-09020 Privilege escalation through command injection in fscrypt CVSS 3.1HIGH 7.3
  • TI-2022-09019 Local Denial of Service in fscrypt PAM module CVSS 3.1MEDIUM 5.5
  • TI-2022-09018 Denial of Service in fscrypt CVSS 3.1MEDIUM 5.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences