CVE-2016-4997

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 6%CVSS: 7.8Exploit: NoneExposed: 0

A fix is available — apply it.

The compat IPT_SO_SET_REPLACE and IP6T_SO_SET_REPLACE setsockopt implementations in the netfilter subsystem in the Linux kernel before 4.6.3 allow local users to gain privileges or cause a denial of service (memory corruption) by leveraging in-container root access to provide a crafted offset value that triggers an unintended decrement.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
66(Track)
EG Risk 66/100SSVC: 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
Severity78% × 45%
Exploitation65% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
92.2%
KEV
Not listed

Published

July 3, 2016

Last Modified

May 6, 2026

References (86)

Patch Availability(15)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-image-4.4.0-1019-snapdragon (4.4.0-1019.22) @ xenial2026-05-22ubuntu
ubuntulinux-image-extra-4.4.0-28-generic (4.4.0-28.47~14.04.1) @ trusty2026-05-22ubuntu
ubuntulinux-image-extra-3.16.0-76-generic (3.16.0-76.98~14.04.1) @ trusty2026-05-22ubuntu
ubuntulinux-image-4.2.0-1033-raspi2 (4.2.0-1033.43) @ wily2026-05-22ubuntu
ubuntulinux-image-extra-3.19.0-64-generic (3.19.0-64.72~14.04.1) @ trusty2026-05-22ubuntu
ubuntulinux-image-extra-4.2.0-41-generic (4.2.0-41.48~14.04.1) @ trusty2026-05-22ubuntu
ubuntulinux-image-4.4.0-1016-raspi2 (4.4.0-1016.22) @ xenial2026-05-22ubuntu
ubuntulinux-image-extra-4.4.0-28-generic (4.4.0-28.47) @ xenial2026-05-22ubuntu
ubuntulinux-image-3.13.0-91-generic (3.13.0-91.138~precise1) @ precise2026-05-22ubuntu
ubuntulinux-image-4.2.0-41-generic-lpae (4.2.0-41.48) @ wily2026-05-22ubuntu
ubuntulinux-image-extra-3.13.0-91-generic (3.13.0-91.138) @ trusty2026-05-22ubuntu
ubuntulinux-image-3.2.0-128-highbank (3.2.0-128.173) @ precise2026-05-22ubuntu
redhatkernel-rt-0:3.10.0-327.36.1.rt56.237.el72016-09-15redhat
redhatkernel-0:3.10.0-327.36.1.el72016-09-15redhat
redhatkernel-rt-1:3.10.0-327.rt56.197.el6rt2016-09-14redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

All Vendor Advisories

(15)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 10× in last 7d / 41× 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. 2026-07-23 14:14 UTCEPSS rescore
  2. 2026-07-23 01:23 UTCEG score recompute
  3. 2026-07-22 22:02 UTCEG score recompute
  4. 2026-07-22 14:04 UTCEPSS rescore
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  19. 2026-07-13 22:26 UTCEPSS rescore
  20. 2026-07-13 06:09 UTCEPSS rescore
  21. 2026-07-12 09:07 UTCOSV refresh
  22. 2026-07-12 05:43 UTCEPSS rescore
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  24. 2026-07-11 08:23 UTCEPSS rescore
  25. 2026-07-09 19:05 UTCEPSS rescore
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  1. 2026-07-08 15:10 UTCEPSS rescore
  2. 2026-07-07 13:42 UTCEPSS rescore
  3. 2026-07-06 16:24 UTCEPSS rescore
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  5. 2026-07-06 02:20 UTCEPSS rescore
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  7. 2026-07-05 02:27 UTCEPSS rescore
  8. 2026-07-04 06:28 UTCEPSS rescore
  9. 2026-07-01 15:02 UTCEPSS rescore
  10. 2026-06-30 23:19 UTCEPSS rescore
  11. 2026-06-29 14:03 UTCEPSS rescore
  12. 2026-06-28 04:53 UTCEPSS rescore
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  19. 2026-06-23 21:30 UTCEPSS rescore
  20. 2026-06-23 14:30 UTCOSV refresh
  21. 2026-06-22 14:23 UTCEPSS rescore
  22. 2026-06-21 14:54 UTCEPSS rescore
  23. 2026-06-21 14:54 UTCEPSS rescore
  24. 2026-06-21 01:57 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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  39. 2026-06-10 22:15 UTCEPSS rescore
  40. 2026-06-10 13:18 UTCEPSS rescore
  41. 2026-06-07 15:22 UTCEPSS rescore
  42. 2026-06-07 15:22 UTCEPSS rescore
  43. 2026-06-06 17:59 UTCOSV refresh
  44. 2026-06-05 22:44 UTCEPSS rescore
  45. 2026-06-05 06:08 UTCEPSS rescore
  46. 2026-06-05 06:08 UTCEPSS rescore
  47. 2026-06-04 13:10 UTCEPSS rescore
  48. 2026-06-04 13:10 UTCEPSS rescore
  49. 2026-06-02 20:10 UTCEPSS rescore
  50. 2026-06-01 13:49 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
  55. 2026-05-29 13:41 UTCEPSS rescore
  56. 2026-05-28 13:42 UTCEPSS rescore
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  58. 2026-05-27 13:38 UTCEPSS rescore
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  60. 2026-05-26 13:42 UTCEPSS rescore
  61. 2026-05-24 16:43 UTCEPSS rescore
  62. 2026-05-22 21:15 UTCEPSS rescore
  63. 2026-05-22 21:15 UTCEPSS rescore
  64. 2026-05-22 19:44 UTCEG score recompute
  65. 2026-05-22 19:44 UTCVendor advisory
  66. 2026-05-22 19:44 UTCGHSA enrichment
  67. 2026-05-21 22:40 UTCEPSS rescore
  68. 2026-05-20 22:37 UTCEPSS rescore
  69. 2026-05-20 22:37 UTCEPSS rescore
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  74. 2026-05-18 21:30 UTCEPSS rescore
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Publicly available exploits

(3 references)

Working exploit code is in the public domain (1 Metasploit module) (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-40489
    First seen Oct 10, 2016

    Linux Kernel 4.6.2 (Ubuntu 16.04.1) - 'IP6T_SO_SET_REPLACE' Local Privilege Escalation

    Open source ↗
  • Exploit-DBEDB-40435✓ verified
    First seen Sep 27, 2016

    Linux Kernel 4.6.3 (x86) - 'Netfilter' Local Privilege Escalation (Metasploit)

    Open source ↗
  • Metasploitexploit/linux/local/netfilter_priv_esc_ipv4✓ verified
    First seen Jun 3, 2016

    Linux Kernel 4.6.3 Netfilter Privilege Escalation

    Open source ↗

Frequently asked(5)

What is CVE-2016-4997?
CVE-2016-4997 is a high vulnerability published on July 3, 2016. The compat IPTSOSETREPLACE and IP6TSOSETREPLACE setsockopt implementations in the netfilter subsystem in the Linux kernel before 4.6.3 allow local users to gain privileges or cause a denial of service (memory corruption) by leveraging in-container root access to provide a crafted offset value that…
When was CVE-2016-4997 disclosed?
CVE-2016-4997 was first published in the National Vulnerability Database on July 3, 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-2016-4997 actively exploited?
CVE-2016-4997 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 92.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2016-4997?
CVE-2016-4997 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2016-4997?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-4997, 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.

Dependency Blast Radius

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