CVE-2026-74409

HighCVSS 8.8

Published: 15/08/2026(UTC)Updated: 17/08/2026(UTC)Translated: 15/08/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.24%

16th percentile - higher than 16% of all known CVEs

Summary

In the Linux kernel, the rtw89 driver lacks a bounds check on the mac_id field from firmware, which can lead to an out-of-bounds array access. An attacker could exploit this to leak kernel memory.

Risk Assessment

Risk of kernel memory disclosure and potential system crash.

Recommendation

Install a kernel patch that adds a bounds check before using mac_id as an array index.

Original NVD description (English source)

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.