CVE-2026-74410
Received Received - Intake

WiFi OOB Read in rtw88 Linux Kernel Driver

Publication date: 2026-08-15

Last updated on: 2026-08-15

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: wifi: rtw88: fix OOB read from firmware RX descriptor exceeding DMA buffer In rtw_pci_rx_napi(), new_len is computed as the sum of pkt_len (14-bit descriptor field, max 16383) and pkt_offset (drv_info_sz + shift, both firmware-controlled). The result can exceed RTK_PCI_RX_BUF_SIZE (11478), causing an out-of-bounds read from the pre-allocated DMA buffer when skb_put_data copies new_len bytes. The USB transport already validates this (rtw_usb_rx_data_put checks against RTW_USB_MAX_RECVBUF_SZ); the PCIe path does not. Add a check that new_len does not exceed the DMA buffer size.

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Meta Information

Published
2026-08-15
Last Modified
2026-08-15
Generated
2026-08-15
AI Q&A
2026-08-15
EPSS Evaluated
N/A
NVD
CVE-2026-74410
EUVD
EUVD-2026-59557

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
realtek rtw88 *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a vulnerability in the Linux kernel's wifi driver for Realtek rtw88 devices. It involves an out-of-bounds read issue in the rtw_pci_rx_napi() function where a computed length (new_len) exceeds the allocated DMA buffer size. The issue arises because new_len is calculated using firmware-controlled values (pkt_offset) and a descriptor field (pkt_len), which can sum to more than the buffer can handle.

Detection Guidance

This vulnerability involves an out-of-bounds read in the Linux kernel's rtw88 WiFi driver. Detection requires checking if your system uses the affected driver version. Inspect loaded kernel modules with lsmod | grep rtw88. If present, verify the driver version matches vulnerable releases. Monitor kernel logs for OOB read errors or crashes during WiFi operations.

Impact Analysis

This vulnerability could allow an attacker to read memory outside the intended buffer, potentially leading to information disclosure or system instability. It specifically affects systems using Realtek rtw88 wifi devices with PCIe interfaces. Exploitation might cause crashes or unauthorized data access.

Mitigation Strategies

Update your Linux kernel to a patched version containing the fix for CVE-2026-74410. If using a distribution kernel, apply available updates via your package manager. For custom kernels, rebuild with the patch applied. Temporarily disable the rtw88 driver if updates are unavailable by blacklisting the module (echo blacklist rtw88 | sudo tee /etc/modprobe.d/blacklist-rtw88.conf).

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