wifi: rtw89: add bounds check on firmware mac_id in link lookup (CVE-2026-74409) | HOL Guard CVE

High · CVSS 8.8CVE-2026-74409

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

Answer in brief

CVE-2026-74409 records a High severity (CVSS 8.8) vulnerability in wifi: rtw89: add bounds check on firmware mac_id in link lookup. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 15, 2026Updated Aug 17, 2026Source checked Sep 29, 2026First seen by HOL Aug 15, 2026Material review Aug 17, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.8
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=144c6cd24b3556e6e7a14271cee57a42ebf97450 <ad445de67359f24088d4305c05fbd7e34c4e35e3 \|\| >=144c6cd24b3556e6e7a14271cee57a42ebf97450 <920101305e7601a33b9e01019f4ca526af2526ae \|\| >=144c6cd24b3556e6e7a14271cee57a42ebf97450 <6d88244bb129755acca696f9227200f4a2d106a6	ad445de67359f24088d4305c05fbd7e34c4e35e3, 920101305e7601a33b9e01019f4ca526af2526ae, 6d88244bb129755acca696f9227200f4a2d106a6
Linux/Linuxgeneric	6.14	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to ad445de67359f24088d4305c05fbd7e34c4e35e3 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 15, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.