CVE-2015-4178

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2022-05-17. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

The fs_pin implementation in the Linux kernel before 4.0.5 does not ensure the internal consistency of a certain list data structure, which allows local users to cause a denial of service (system crash) by leveraging user-namespace root access for an MNT_DETACH umount2 system call, related to fs/fs_pin.c and include/linux/fs_pin.h.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
30%
KEV
Not listed

Published

May 2, 2016

Last Modified

June 17, 2026

References (14)

Data Freshness Timeline

(refreshed 6× in last 7d / 23× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 115 total refreshes for this CVE.

  1. 2026-08-20 22:50 UTCEPSS rescore
  2. 2026-08-19 16:59 UTCEPSS rescore
  3. 2026-08-18 13:43 UTCEPSS rescore
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  22. 2026-07-23 01:18 UTCEG score recompute
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  24. 2026-07-22 21:58 UTCEG score recompute
  25. 2026-07-22 14:04 UTCEPSS rescore
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  49. 2026-06-12 23:09 UTCEPSS rescore
  50. 2026-06-11 13:57 UTCEPSS rescore
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  75. 2026-05-26 07:16 UTCEPSS rescore

Frequently asked(5)

What is CVE-2015-4178?
CVE-2015-4178 is a medium vulnerability published on May 2, 2016. The fspin implementation in the Linux kernel before 4.0.5 does not ensure the internal consistency of a certain list data structure, which allows local users to cause a denial of service (system crash) by leveraging user-namespace root access for an MNTDETACH umount2 system call, related to…
When was CVE-2015-4178 disclosed?
CVE-2015-4178 was first published in the National Vulnerability Database on May 2, 2016, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-4178 actively exploited?
CVE-2015-4178 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 69.7% of all scored CVEs.
What is the CVSS score of CVE-2015-4178?
CVE-2015-4178 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2015-4178?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-4178, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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