Bug 2516782 (CVE-2026-74409) - CVE-2026-74409 kernel: wifi: rtw89: add bounds check on firmware mac_id in link lookup
Summary: CVE-2026-74409 kernel: wifi: rtw89: add bounds check on firmware mac_id in li...
Keywords:
Status: NEW
Alias: CVE-2026-74409
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-15 06:33 UTC by OSIDB Bzimport
Modified: 2026-08-20 21:25 UTC (History)
2 users (show)

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Description OSIDB Bzimport 2026-08-15 06:33:13 UTC 
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.
Comment 1 Keith Grant 2026-08-20 21:18:44 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081510-CVE-2026-74409-e3cf@gregkh/T
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