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CVE-2018-6558

22
FAUCET Score

CVE-2018-6558 describes a privilege escalation vulnerability in the pam_fscrypt module of fscrypt versions prior to 0.2.4, specifically affecting Google fscrypt. An attacker can gain root privileges by successfully logging in through certain Linux-PAM applications, as the module incorrectly restores primary and supplementary group IDs to those of the root user. This medium-severity vulnerability has a CVSS score of 6.5, indicating a low attack complexity and high impact on integrity. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.2.4CPE matchmatch criteria
cpe:2.3:a:google:fscrypt:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.5MEDIUM

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.62%
Probability of exploitation in next 30 days
EPSS Percentile
46.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0062 is in the 56th percentile among its peer group of 21,939 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
gopatch availablevia ghsa
Product: github.com/google/fscryptFixed in: 0.2.4
ubuntupatch availablevia nvd_reference
View patch

Vendor Advisories (1)

goGHSA-qj26-7grj-whg3medium

Privilege Escalation in fscrypt

Jun 23, 2021

References

github.com / google/fscrypt/commit/3022c1603d968c22f147b4a2c49c4637dd1be91b
PatchThird Party Advisory
github.com / google/fscrypt/commit/315f9b042237200174a1fb99427f74027e191d66
PatchThird Party Advisory
github.com / google/fscrypt/issues/77
Issue TrackingThird Party Advisory
launchpad.net / bugs/1787548
Issue TrackingPatchThird Party Advisory