What’s Vulnerable › Vulnerabilities

CVE-2026-74409: wifi: rtw89: add bounds check on firmware mac_id in link lookup

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-10-16

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.

Affected products

• Linux kernel: 6.14 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/6d88244bb129755acca696f9227200f4a2d106a6
• https://git.kernel.org/stable/c/920101305e7601a33b9e01019f4ca526af2526ae
• https://git.kernel.org/stable/c/ad445de67359f24088d4305c05fbd7e34c4e35e3

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