CVE-2018-21008

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2022-05-24. 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: 1%CVSS: 5.5Exploit: None knownExposed: 0

A fix is available — apply it.

An issue was discovered in the Linux kernel before 4.16.7. A use-after-free can be caused by the function rsi_mac80211_detach in the file drivers/net/wireless/rsi/rsi_91x_mac80211.c.

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%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
45%
KEV
Not listed

Published

September 4, 2019

Last Modified

November 21, 2024

References (24)

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-image-virtual-lts-xenial (4.4.0.166.174) @ xenial2026-05-27ubuntu
ubuntulinux-image-virtual-hwe-16.04 (4.15.0.66.86) @ xenial2026-05-27ubuntu
ubuntulinux-image-azure (4.15.0.1061.47) @ trusty2026-05-27ubuntu
ubuntulinux-image-4.4.0-166-powerpc-e500mc (4.4.0-166.195~14.04.1) @ trusty2026-05-27ubuntu

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.

Affected Packages

(6 across 5 ecosystems)
Debian:8(2)
PackageVulnerable rangeFixed inDependents
linux3.16.36-1 ... 3.16.72-1 (67 versions)3.16.74-1—
linux-4.94.9.110-1~deb8u1, 4.9.144-3.1~deb8u1, 4.9.168-1~deb8u1, 4.9.189-3~deb8u14.9.210-1~deb8u1—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux—4.18.6-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux—4.18.6-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux—4.18.6-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux—4.18.6-1—

Weakness Classification(1)

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

All Vendor Advisories

(4)

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 8× in last 7d / 30× 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 131 total refreshes for this CVE.

  1. 2026-08-21 15:14 UTCOSV refresh
  2. 2026-08-20 22:51 UTCEPSS rescore
  3. 2026-08-19 17:00 UTCEPSS rescore
  4. 2026-08-18 13:44 UTCEPSS rescore
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  6. 2026-08-16 14:51 UTCEPSS rescore
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  12. 2026-08-08 16:32 UTCEPSS rescore
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  14. 2026-08-06 13:42 UTCEPSS rescore
  15. 2026-08-06 01:21 UTCOSV refresh
  16. 2026-08-05 19:13 UTCEPSS rescore
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  25. 2026-07-25 14:14 UTCEPSS rescore
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  1. 2026-07-24 14:14 UTCEPSS rescore
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  3. 2026-07-23 14:15 UTCEPSS rescore
  4. 2026-07-23 01:35 UTCEG score recompute
  5. 2026-07-22 22:15 UTCEG score recompute
  6. 2026-07-22 14:05 UTCEPSS rescore
  7. 2026-07-21 15:22 UTCEPSS rescore
  8. 2026-07-20 17:04 UTCEPSS rescore
  9. 2026-07-20 17:04 UTCEPSS rescore
  10. 2026-07-20 07:32 UTCOSV refresh
  11. 2026-07-19 14:28 UTCEPSS rescore
  12. 2026-07-19 02:26 UTCEPSS rescore
  13. 2026-07-19 02:26 UTCEPSS rescore
  14. 2026-07-16 16:59 UTCEPSS rescore
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  18. 2026-07-15 01:56 UTCEPSS rescore
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  20. 2026-07-13 22:27 UTCEPSS rescore
  21. 2026-07-13 22:26 UTCEPSS rescore
  22. 2026-07-13 06:10 UTCEPSS rescore
  23. 2026-07-12 05:43 UTCEPSS rescore
  24. 2026-07-11 08:24 UTCEPSS rescore
  25. 2026-07-09 19:06 UTCEPSS rescore
  26. 2026-07-08 15:11 UTCEPSS rescore
  27. 2026-07-07 13:42 UTCEPSS rescore
  28. 2026-07-07 13:42 UTCEPSS rescore
  29. 2026-07-06 16:24 UTCEPSS rescore
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  31. 2026-07-06 02:20 UTCEPSS rescore
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  35. 2026-07-03 01:05 UTCOSV refresh
  36. 2026-07-02 16:54 UTCEPSS rescore
  37. 2026-07-01 15:03 UTCEPSS rescore
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  39. 2026-06-30 23:20 UTCEPSS rescore
  40. 2026-06-30 23:19 UTCEPSS rescore
  41. 2026-06-29 14:03 UTCEPSS rescore
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  43. 2026-06-28 04:53 UTCEPSS rescore
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  45. 2026-06-27 03:06 UTCEPSS rescore
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  47. 2026-06-25 13:47 UTCEPSS rescore
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  49. 2026-06-24 14:02 UTCEPSS rescore
  50. 2026-06-24 14:02 UTCEPSS rescore
  51. 2026-06-23 21:30 UTCEPSS rescore
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  54. 2026-06-22 14:23 UTCEPSS rescore
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  67. 2026-06-15 17:45 UTCEPSS rescore
  68. 2026-06-14 23:15 UTCEPSS rescore
  69. 2026-06-14 23:14 UTCEPSS rescore
  70. 2026-06-14 19:13 UTCOSV refresh
  71. 2026-06-13 22:58 UTCEPSS rescore
  72. 2026-06-12 23:09 UTCEPSS rescore
  73. 2026-06-12 23:09 UTCEPSS rescore
  74. 2026-06-11 13:57 UTCEPSS rescore
  75. 2026-06-10 22:16 UTCEPSS rescore

Frequently asked(5)

What is CVE-2018-21008?
CVE-2018-21008 is a medium vulnerability published on September 4, 2019. An issue was discovered in the Linux kernel before 4.16.7. A use-after-free can be caused by the function rsimac80211detach in the file drivers/net/wireless/rsi/rsi91xmac80211.c.
When was CVE-2018-21008 disclosed?
CVE-2018-21008 was first published in the National Vulnerability Database on September 4, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-21008 actively exploited?
CVE-2018-21008 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 55.5% of all scored CVEs.
What is the CVSS score of CVE-2018-21008?
CVE-2018-21008 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2018-21008?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-21008, 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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