CVE-2016-6516

HIGHNVD 7.47.4—
EchelonGraph scoreMEDIUM confidence

Score 7.4 from GitHub Security Advisory (severity: HIGH) published 2022-05-17. NVD baseline CVSS 7.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
7.4
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.4Exploit: NoneExposed: 0

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

Race condition in the ioctl_file_dedupe_range function in fs/ioctl.c in the Linux kernel through 4.7 allows local users to cause a denial of service (heap-based buffer overflow) or possibly gain privileges by changing a certain count value, aka a "double fetch" vulnerability.

CVSS v3
7.4
EG Score
7.4(medium)
EG Risk
54(Track)
EG Risk 54/100SSVC: 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
Severity74% × 45%
Exploitation40% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
57.5%
KEV
Not listed

Published

August 6, 2016

Last Modified

May 6, 2026

References (10)

Data Freshness Timeline

(refreshed 14× in last 7d / 42× 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.

  1. 2026-07-24 14:13 UTCEPSS rescore
  2. 2026-07-23 14:15 UTCEPSS rescore
  3. 2026-07-23 01:23 UTCEG score recompute
  4. 2026-07-22 22:03 UTCEG score recompute
  5. 2026-07-22 14:04 UTCEPSS rescore
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  22. 2026-07-12 08:08 UTCOSV refresh
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  1. 2026-07-09 19:06 UTCEPSS rescore
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  20. 2026-06-23 13:50 UTCOSV refresh
  21. 2026-06-22 14:23 UTCEPSS rescore
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  26. 2026-06-19 19:23 UTCEPSS rescore
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  28. 2026-06-18 17:50 UTCEPSS rescore
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  38. 2026-06-08 14:14 UTCEPSS rescore
  39. 2026-06-07 15:22 UTCEPSS rescore
  40. 2026-06-07 15:22 UTCEPSS rescore
  41. 2026-06-06 16:29 UTCOSV refresh
  42. 2026-06-06 13:45 UTCEPSS rescore
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  44. 2026-06-05 22:44 UTCEPSS rescore
  45. 2026-06-05 06:08 UTCEPSS rescore
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  47. 2026-06-04 13:10 UTCEPSS rescore
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  49. 2026-06-02 20:10 UTCEPSS rescore
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  52. 2026-05-31 22:28 UTCEPSS rescore
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  54. 2026-05-31 00:14 UTCEPSS rescore
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  63. 2026-05-24 16:44 UTCEPSS rescore
  64. 2026-05-22 21:15 UTCEPSS rescore
  65. 2026-05-22 19:07 UTCEG score recompute
  66. 2026-05-22 19:07 UTCGHSA enrichment
  67. 2026-05-20 22:37 UTCEPSS rescore
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Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCwpengfei/CVE-2016-6516-exploit
    First seen Dec 7, 2017

    An demonstration of how to exploit double-fetch vulnerability CVE-2016-6516

    Open source ↗

Frequently asked(5)

What is CVE-2016-6516?
CVE-2016-6516 is a high vulnerability published on August 6, 2016. Race condition in the ioctlfilededupe_range function in fs/ioctl.c in the Linux kernel through 4.7 allows local users to cause a denial of service (heap-based buffer overflow) or possibly gain privileges by changing a certain count value, aka a "double fetch" vulnerability.
When was CVE-2016-6516 disclosed?
CVE-2016-6516 was first published in the National Vulnerability Database on August 6, 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-2016-6516 actively exploited?
CVE-2016-6516 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 57.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2016-6516?
CVE-2016-6516 has a CVSS v3 base score of 7.4 (NVD).
How do I remediate CVE-2016-6516?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-6516, 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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