CVE-2015-4176

MEDIUMNVD 5.55.5—

5.5

fs/namespace.c in the Linux kernel before 4.0.2 does not properly support mount connectivity, which allows local users to read arbitrary files by leveraging user-namespace root access for deletion of a file or directory.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 15.9%
KEV: Not listed

Published

May 2, 2016

Last Modified

May 6, 2026

References (10)

secalert@redhathttp://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e0c9c0afd2fc958ffa34b697972721d81df8a56f
secalert@redhathttp://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.2
secalert@redhathttp://www.openwall.com/lists/oss-security/2015/06/04/5
secalert@redhathttps://bugzilla.redhat.com/show_bug.cgi?id=1249442
secalert@redhathttps://github.com/torvalds/linux/commit/e0c9c0afd2fc958ffa34b697972721d81df8a56f
af854a3a-2127-422b-91ae-364da2661108http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e0c9c0afd2fc958ffa34b697972721d81df8a56f
af854a3a-2127-422b-91ae-364da2661108http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.2
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2015/06/04/5
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=1249442
af854a3a-2127-422b-91ae-364da2661108https://github.com/torvalds/linux/commit/e0c9c0afd2fc958ffa34b697972721d81df8a56f

Data Freshness Timeline

(refreshed 8× in last 7d / 20× 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.

2026-06-08 14:14 UTCEPSS rescore
2026-06-07 15:22 UTCEPSS rescore
2026-06-06 13:45 UTCEPSS rescore
2026-06-05 22:44 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:09 UTCEPSS rescore
2026-06-01 13:49 UTCEPSS rescore
2026-06-01 13:49 UTCEPSS rescore
2026-05-31 22:28 UTCEPSS rescore
2026-05-31 22:28 UTCEPSS rescore
2026-05-31 22:28 UTCEPSS rescore
2026-05-31 00:14 UTCEPSS rescore
2026-05-29 13:41 UTCEPSS rescore
2026-05-28 13:42 UTCEPSS rescore
2026-05-28 13:42 UTCEPSS rescore
2026-05-27 13:38 UTCEPSS rescore
2026-05-27 13:38 UTCEPSS rescore
2026-05-26 13:41 UTCEPSS rescore

Frequently asked(5)

What is CVE-2015-4176?

CVE-2015-4176 is a medium vulnerability published on May 2, 2016. fs/namespace.c in the Linux kernel before 4.0.2 does not properly support mount connectivity, which allows local users to read arbitrary files by leveraging user-namespace root access for deletion of a file or directory.

When was CVE-2015-4176 disclosed?

CVE-2015-4176 was first published in the National Vulnerability Database on May 2, 2016, with the most recent update on May 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2015-4176 actively exploited?

CVE-2015-4176 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 15.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2015-4176?

CVE-2015-4176 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2015-4176?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-4176, 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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CVE-2015-4176

📅 Published

🔄 Last Modified

🔗 References (10)