CVE-2026-74409

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-15. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

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

In the Linux kernel, the following vulnerability has been resolved:

wifi: rtw89: add bounds check on firmware mac_id in link lookup

The mac_id field in RX descriptors is 8 bits wide (0-255), but assoc_link_on_macid[] has only RTW89_MAX_MAC_ID_NUM (128) entries. While the driver currently assigns mac_id values below 128, the descriptor value comes from firmware and is not validated before use as an array index. Add a defensive bounds check in rtw89_assoc_link_rcu_dereference() to guard against out-of-range firmware values.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
KEV
Not listed

Published

August 15, 2026

Last Modified

August 17, 2026

Advisory Details (3)

Auto-updated Aug 17, 2026
No patch confirmed yet.
generic

wifi: rtw89: add bounds check on firmware mac_id in link lookup - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ad445de67359f24088d4305c05fbd7e34c4e35e3
generic

wifi: rtw89: add bounds check on firmware mac_id in link lookup - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/920101305e7601a33b9e01019f4ca526af2526ae
generic

wifi: rtw89: add bounds check on firmware mac_id in link lookup - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6d88244bb129755acca696f9227200f4a2d106a6

Vendor Advisories for CVE-2026-74409(1)

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

Data Freshness Timeline

(refreshed 29× in last 7d / 29× 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. 2026-08-20 22:56 UTCEPSS rescore
  2. 2026-08-20 22:06 UTCGHSA enrichment
  3. 2026-08-20 09:28 UTCGHSA enrichment
  4. 2026-08-19 20:58 UTCEG score recompute
  5. 2026-08-19 20:58 UTCGHSA enrichment
  6. 2026-08-19 17:04 UTCEPSS rescore
  7. 2026-08-19 08:27 UTCGHSA enrichment
  8. 2026-08-18 19:57 UTCEG score recompute
  9. 2026-08-18 19:57 UTCGHSA enrichment
  10. 2026-08-18 13:49 UTCEPSS rescore
  11. 2026-08-18 13:49 UTCEPSS rescore
  12. 2026-08-18 07:27 UTCGHSA enrichment
  13. 2026-08-17 18:56 UTCEG score recompute
  14. 2026-08-17 18:56 UTCGHSA enrichment
  15. 2026-08-17 13:47 UTCEPSS rescore
  16. 2026-08-17 06:25 UTCEG score recompute
  17. 2026-08-17 06:25 UTCGHSA enrichment
  18. 2026-08-17 05:55 UTCEG score recompute▲ 8.80
  19. 2026-08-17 05:55 UTCGHSA enrichment
  20. 2026-08-17 05:54 UTCMITRE cvelistV5CVSS v3 → 8.8 · severity → HIGH
  21. 2026-08-17 05:26 UTCEG score recompute
  22. 2026-08-17 05:26 UTCGHSA enrichment
  23. 2026-08-17 05:25 UTCMITRE cvelistV5
  24. 2026-08-16 14:56 UTCEPSS rescore
  25. 2026-08-16 14:56 UTCEPSS rescore
Show 4 more
  1. 2026-08-16 02:15 UTCEPSS rescore
  2. 2026-08-15 06:23 UTCNVD update
  3. 2026-08-15 06:13 UTCEG score recompute
  4. 2026-08-15 06:12 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-74409?
CVE-2026-74409 is a high vulnerability published on August 15, 2026. In the Linux kernel, the following vulnerability has been resolved: wifi: rtw89: add bounds check on firmware mac_id in link lookup The mac_id field in RX descriptors is 8 bits wide (0-255), but assoclinkonmacid[] has only RTW89MAXMACID_NUM (128) entries. While the driver currently assigns mac_id…
When was CVE-2026-74409 disclosed?
CVE-2026-74409 was first published in the National Vulnerability Database on August 15, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74409 actively exploited?
CVE-2026-74409 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 84.3% of all scored CVEs.
What is the CVSS score of CVE-2026-74409?
CVE-2026-74409 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-74409?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74409, 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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