CVE-2021-43975

MEDIUMNVD 6.76.7—
EchelonGraph scoreMEDIUM confidence

Score 6.7 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 6.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.7EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.7Exploit: None knownExposed: 0

A fix is available — apply it.

In the Linux kernel through 5.15.2, hw_atl_utils_fw_rpc_wait in drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_utils.c allows an attacker (who can introduce a crafted device) to trigger an out-of-bounds write via a crafted length value.

CVSS v3
6.7
EG Score
6.7(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity67% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
45%
KEV
Not listed

Published

November 17, 2021

Last Modified

November 21, 2024

References (14)

Vendor Advisories for CVE-2021-43975(4)

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

Patch Availability(11)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-headers-azure-fde (5.4.0.1070.73+cvm1.16) @ focal2026-05-26ubuntu
ubuntulinux-image-unsigned-5.13.0-37-lowlatency (5.13.0-37.42~20.04.1) @ focal2026-05-26ubuntu
ubuntulinux-buildinfo-4.15.0-1137-azure (4.15.0-1137.150~16.04.1) @ xenial2026-05-26ubuntu
ubuntulinux-tools-5.13.0-1021-azure (5.13.0-1021.24~20.04.1) @ focal2026-05-26ubuntu
ubuntulinux-buildinfo-5.14.0-1022-oem (5.14.0-1022.24) @ focal2026-05-26ubuntu
ubuntulinux-image-lowlatency (5.4.0.100.104) @ focal2026-05-26ubuntu
ubuntulinux-gke-tools-5.4.0-1063 (5.4.0-1063.66) @ focal2026-05-26ubuntu
redhatkernel-0:4.18.0-477.51.1.el8_82024-03-19redhat
redhatkernel-0:4.18.0-372.95.1.el8_62024-03-06redhat
redhatkernel-0:4.18.0-513.5.1.el8_92023-11-14redhat
redhatkernel-rt-0:4.18.0-513.5.1.rt7.307.el8_92023-11-14redhat

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.

Affected Packages

(6 across 6 ecosystems)
Debian:10(1)
PackageVulnerable rangeFixed inDependents
linux4.19.118-1 ... 4.19.98-1~bpo9+1 (36 versions)4.19.232-1—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux5.10.46-4, 5.10.46-5, 5.10.70-1, 5.10.70-1~bpo10+15.10.84-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux—5.15.5-2—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux—5.15.5-2—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux—5.15.5-2—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
linux-4.194.19.132-1~deb9u1 ... 4.19.208-1~deb9u1 (10 versions)4.19.232-1~deb9u1—

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 6× 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 164 total refreshes for this CVE.

  1. 2026-09-18 19:23 UTCEPSS rescore
  2. 2026-09-17 19:23 UTCEPSS rescore
  3. 2026-09-17 19:23 UTCEPSS rescore
  4. 2026-09-16 14:05 UTCEPSS rescore
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  9. 2026-09-08 21:56 UTCEPSS rescore
  10. 2026-09-07 15:58 UTCEPSS rescore
  11. 2026-09-06 13:45 UTCEPSS rescore
  12. 2026-09-06 03:00 UTCOSV refresh
  13. 2026-09-05 15:25 UTCEPSS rescore
  14. 2026-09-04 13:57 UTCEPSS rescore
  15. 2026-09-04 05:03 UTCEPSS rescore
  16. 2026-09-02 14:09 UTCEPSS rescore
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  19. 2026-08-30 19:14 UTCEPSS rescore
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  1. 2026-08-24 14:13 UTCEPSS rescore
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  3. 2026-08-21 23:46 UTCEPSS rescore
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  6. 2026-08-19 17:01 UTCEPSS rescore
  7. 2026-08-19 14:29 UTCOSV refresh
  8. 2026-08-18 13:45 UTCEPSS rescore
  9. 2026-08-17 13:44 UTCEPSS rescore
  10. 2026-08-16 14:53 UTCEPSS rescore
  11. 2026-08-16 02:11 UTCEPSS rescore
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  20. 2026-08-05 19:14 UTCEPSS rescore
  21. 2026-08-04 10:34 UTCEPSS rescore
  22. 2026-08-04 10:27 UTCOSV refresh
  23. 2026-08-03 10:33 UTCEPSS rescore
  24. 2026-08-02 02:24 UTCEPSS rescore
  25. 2026-08-01 04:13 UTCEPSS rescore
  26. 2026-07-30 16:25 UTCEPSS rescore
  27. 2026-07-30 01:28 UTCEPSS rescore
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  31. 2026-07-25 14:15 UTCEPSS rescore
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  34. 2026-07-23 02:05 UTCEG score recompute
  35. 2026-07-22 22:51 UTCEG score recompute
  36. 2026-07-22 14:06 UTCEPSS rescore
  37. 2026-07-21 15:22 UTCEPSS rescore
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  39. 2026-07-20 17:05 UTCEPSS rescore
  40. 2026-07-19 14:29 UTCEPSS rescore
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  42. 2026-07-18 10:02 UTCEPSS rescore
  43. 2026-07-18 10:02 UTCEPSS rescore
  44. 2026-07-18 07:29 UTCOSV refresh
  45. 2026-07-16 17:00 UTCEPSS rescore
  46. 2026-07-16 17:00 UTCEPSS rescore
  47. 2026-07-15 16:55 UTCEPSS rescore
  48. 2026-07-15 16:55 UTCEPSS rescore
  49. 2026-07-15 01:58 UTCEPSS rescore
  50. 2026-07-13 22:27 UTCEPSS rescore
  51. 2026-07-13 22:27 UTCEPSS rescore
  52. 2026-07-13 06:11 UTCEPSS rescore
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  54. 2026-07-12 05:44 UTCEPSS rescore
  55. 2026-07-11 08:25 UTCEPSS rescore
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  57. 2026-07-09 19:07 UTCEPSS rescore
  58. 2026-07-08 15:12 UTCEPSS rescore
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  70. 2026-06-30 23:20 UTCEPSS rescore
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  72. 2026-06-30 05:30 UTCOSV refresh
  73. 2026-06-29 14:04 UTCEPSS rescore
  74. 2026-06-28 14:05 UTCEPSS rescore
  75. 2026-06-28 04:54 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-43975?
CVE-2021-43975 is a medium vulnerability published on November 17, 2021. In the Linux kernel through 5.15.2, hwatlutilsfwrpcwait in drivers/net/ethernet/aquantia/atlantic/hwatl/hwatlutils.c allows an attacker (who can introduce a crafted device) to trigger an out-of-bounds write via a crafted length value.
When was CVE-2021-43975 disclosed?
CVE-2021-43975 was first published in the National Vulnerability Database on November 17, 2021, 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-2021-43975 actively exploited?
CVE-2021-43975 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 55.1% of all scored CVEs.
What is the CVSS score of CVE-2021-43975?
CVE-2021-43975 has a CVSS v3 base score of 6.7 (NVD).
How do I remediate CVE-2021-43975?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-43975, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-43975

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