CVE-2018-3646

MEDIUMNVD 5.65.6—
EchelonGraph scoreMEDIUM confidence

Score 5.6 from GitHub Security Advisory published 2022-05-13. NVD baseline CVSS 5.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.6
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 8%CVSS: 5.6Exploit: NoneExposed: 0

A fix is available — apply it.

Systems with microprocessors utilizing speculative execution and address translations may allow unauthorized disclosure of information residing in the L1 data cache to an attacker with local user access with guest OS privilege via a terminal page fault and a side-channel analysis.

CVSS v3
5.6
EG Score
5.6(medium)
EPSS
94.2%
KEV
Not listed

Published

August 14, 2018

Last Modified

May 29, 2026

References (112)

Vendor Advisories for CVE-2018-3646(17)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(24)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuintel-microcode (3.20180807a.0ubuntu0.16.04.1) @ xenial2026-05-28ubuntu
ubuntulinux-image-extra-3.13.0-155-generic (3.13.0-155.205) @ trusty2026-05-28ubuntu
ubuntulinux-image-generic-lts-trusty (3.13.0.155.145) @ precise2026-05-28ubuntu
ubuntulinux-image-powerpc64-smp (3.2.0.137.152) @ precise2026-05-28ubuntu
ubuntulinux-image-extra-4.4.0-133-generic (4.4.0-133.159~14.04.1) @ trusty2026-05-28ubuntu
ubuntulinux-image-extra-4.4.0-133-generic (4.4.0-133.159) @ xenial2026-05-28ubuntu
ubuntulinux-image-unsigned-4.15.0-32-lowlatency (4.15.0-32.35~16.04.1) @ xenial2026-05-28ubuntu
ubuntulinux-image-unsigned-4.15.0-32-lowlatency (4.15.0-32.35) @ bionic2026-05-28ubuntu
redhatkernel-0:2.6.18-348.41.1.el52018-08-29redhat
redhatkernel-0:2.6.18-434.el52018-08-29redhat
redhatrhvm-appliance-0:4.2-20180813.02018-08-16redhat
redhatrhev-hypervisor7-0:7.3-20180813.0.el7ev2018-08-15redhat
redhatredhat-virtualization-host-0:4.2-20180813.02018-08-15redhat
redhatkernel-rt-1:3.10.0-693.37.4.rt56.629.el6rt2018-08-14redhat
redhatkernel-0:2.6.32-504.72.4.el62018-08-14redhat
redhatkernel-0:3.10.0-862.11.6.el72018-08-14redhat
redhatkernel-0:2.6.32-358.91.4.el62018-08-14redhat
redhatkernel-rt-0:3.10.0-862.11.6.rt56.819.el72018-08-14redhat
redhatkernel-0:3.10.0-514.55.4.el72018-08-14redhat
redhatkernel-0:3.10.0-327.71.4.el72018-08-14redhat
redhatkernel-0:2.6.32-754.3.5.el62018-08-14redhat
redhatkernel-0:2.6.32-431.91.3.el62018-08-14redhat
redhatkernel-0:2.6.32-573.60.4.el62018-08-14redhat
redhatkernel-0:3.10.0-693.37.4.el72018-08-14redhat

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.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(8)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 10× in last 7d / 48× 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. 2026-07-16 16:59 UTCEPSS rescore
  2. 2026-07-16 16:59 UTCEPSS rescore
  3. 2026-07-15 16:55 UTCEPSS rescore
  4. 2026-07-15 16:55 UTCEPSS rescore
  5. 2026-07-15 01:56 UTCEPSS rescore
  6. 2026-07-15 01:56 UTCEPSS rescore
  7. 2026-07-13 22:27 UTCEPSS rescore
  8. 2026-07-13 22:26 UTCEPSS rescore
  9. 2026-07-12 05:43 UTCEPSS rescore
  10. 2026-07-11 08:24 UTCEPSS rescore
  11. 2026-07-09 19:06 UTCEPSS rescore
  12. 2026-07-08 15:11 UTCEPSS rescore
  13. 2026-07-07 13:42 UTCEPSS rescore
  14. 2026-07-07 13:42 UTCEPSS rescore
  15. 2026-07-06 02:20 UTCEPSS rescore
  16. 2026-07-05 02:27 UTCEPSS rescore
  17. 2026-07-04 06:28 UTCEPSS rescore
  18. 2026-07-04 06:28 UTCEPSS rescore
  19. 2026-07-04 02:26 UTCOSV refresh
  20. 2026-07-02 16:54 UTCEPSS rescore
  21. 2026-07-01 15:03 UTCEPSS rescore
  22. 2026-07-01 15:03 UTCEPSS rescore
  23. 2026-06-30 23:20 UTCEPSS rescore
  24. 2026-06-30 23:19 UTCEPSS rescore
  25. 2026-06-29 14:03 UTCEPSS rescore
Show 66 more
  1. 2026-06-28 14:04 UTCEPSS rescore
  2. 2026-06-28 04:53 UTCEPSS rescore
  3. 2026-06-28 04:53 UTCEPSS rescore
  4. 2026-06-27 03:06 UTCEPSS rescore
  5. 2026-06-27 03:06 UTCEPSS rescore
  6. 2026-06-25 13:47 UTCEPSS rescore
  7. 2026-06-25 13:47 UTCEPSS rescore
  8. 2026-06-24 14:02 UTCEPSS rescore
  9. 2026-06-24 14:02 UTCEPSS rescore
  10. 2026-06-23 21:30 UTCEPSS rescore
  11. 2026-06-23 21:30 UTCEPSS rescore
  12. 2026-06-23 21:30 UTCEPSS rescore
  13. 2026-06-22 14:23 UTCEPSS rescore
  14. 2026-06-21 14:54 UTCEPSS rescore
  15. 2026-06-21 14:54 UTCEPSS rescore
  16. 2026-06-21 01:57 UTCEPSS rescore
  17. 2026-06-21 01:57 UTCEPSS rescore
  18. 2026-06-19 19:23 UTCEPSS rescore
  19. 2026-06-19 19:23 UTCEPSS rescore
  20. 2026-06-18 17:50 UTCEPSS rescore
  21. 2026-06-18 17:50 UTCEPSS rescore
  22. 2026-06-17 17:50 UTCEPSS rescore
  23. 2026-06-17 17:50 UTCEPSS rescore
  24. 2026-06-16 17:50 UTCEPSS rescore
  25. 2026-06-16 17:50 UTCEPSS rescore
  26. 2026-06-15 17:45 UTCEPSS rescore
  27. 2026-06-15 14:43 UTCOSV refresh
  28. 2026-06-14 23:15 UTCEPSS rescore
  29. 2026-06-14 23:14 UTCEPSS rescore
  30. 2026-06-13 22:58 UTCEPSS rescore
  31. 2026-06-12 23:09 UTCEPSS rescore
  32. 2026-06-12 23:09 UTCEPSS rescore
  33. 2026-06-11 13:57 UTCEPSS rescore
  34. 2026-06-10 22:16 UTCEPSS rescore
  35. 2026-06-10 13:19 UTCEPSS rescore
  36. 2026-06-08 14:14 UTCEPSS rescore
  37. 2026-06-08 14:14 UTCEPSS rescore
  38. 2026-06-07 15:22 UTCEPSS rescore
  39. 2026-06-07 15:22 UTCEPSS rescore
  40. 2026-06-06 13:45 UTCEPSS rescore
  41. 2026-06-06 13:45 UTCEPSS rescore
  42. 2026-06-05 22:45 UTCEPSS rescore
  43. 2026-06-05 22:45 UTCEPSS rescore
  44. 2026-06-05 06:08 UTCEPSS rescore
  45. 2026-06-05 06:08 UTCEPSS rescore
  46. 2026-06-04 13:10 UTCEPSS rescore
  47. 2026-06-02 20:11 UTCEPSS rescore
  48. 2026-06-02 20:11 UTCEPSS rescore
  49. 2026-06-01 13:50 UTCEPSS rescore
  50. 2026-06-01 13:50 UTCEPSS rescore
  51. 2026-05-31 22:29 UTCEPSS rescore
  52. 2026-05-31 00:14 UTCEPSS rescore
  53. 2026-05-31 00:14 UTCEPSS rescore
  54. 2026-05-29 13:41 UTCEPSS rescore
  55. 2026-05-28 13:42 UTCEPSS rescore
  56. 2026-05-28 13:42 UTCEPSS rescore
  57. 2026-05-28 04:06 UTCEG score recompute
  58. 2026-05-28 04:06 UTCVendor advisory
  59. 2026-05-28 04:05 UTCGHSA enrichment
  60. 2026-05-27 13:38 UTCEPSS rescore
  61. 2026-05-27 13:38 UTCEPSS rescore
  62. 2026-05-26 13:42 UTCEPSS rescore
  63. 2026-05-26 13:42 UTCEPSS rescore
  64. 2026-05-26 07:17 UTCEPSS rescore
  65. 2026-05-26 07:17 UTCEPSS rescore
  66. 2026-05-25 02:49 UTCOSV refresh

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2018-3646?
CVE-2018-3646 is a medium vulnerability published on August 14, 2018. Systems with microprocessors utilizing speculative execution and address translations may allow unauthorized disclosure of information residing in the L1 data cache to an attacker with local user access with guest OS privilege via a terminal page fault and a side-channel analysis.
When was CVE-2018-3646 disclosed?
CVE-2018-3646 was first published in the National Vulnerability Database on August 14, 2018, with the most recent update on May 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-3646 actively exploited?
CVE-2018-3646 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 94.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2018-3646?
CVE-2018-3646 has a CVSS v3 base score of 5.6 (NVD).
How do I remediate CVE-2018-3646?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-3646, 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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