CVE-2026-74410

wifi: rtw88: fix OOB read from firmware RX descriptor exceeding DMA buffer

State: Published
Severity: 8.1 High
Published: Aug 15, 2026
Updated: Oct 16, 2026
Reserved: Aug 15, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.1 High	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	e3037485c68ec1a299ff41160d8fedbd4abc29b9 to before 913bd7d3d3d842b5c1d2b908a0201efa8fc79793Affected e3037485c68ec1a299ff41160d8fedbd4abc29b9 to before 45abc14ab3f15da7d689f1a8809c1a01240a94d9Affected e3037485c68ec1a299ff41160d8fedbd4abc29b9 to before 08193e733e5d4790e6c937af86d78793b02709beAffected e3037485c68ec1a299ff41160d8fedbd4abc29b9 to before 6a3c384393d3f0b41669ed5a2e88744aad9d87c8Affected e3037485c68ec1a299ff41160d8fedbd4abc29b9 to before 26c183a86ea4dd1f2ff90c6f783649e7f5722a10Affected e3037485c68ec1a299ff41160d8fedbd4abc29b9 to before 01155ded5d4dad61840a9a3c33ab56778ef1f100Affected e3037485c68ec1a299ff41160d8fedbd4abc29b9 to before 1554fa522f16ec7c5c342ad33fe734eeb6eb2452Affected e3037485c68ec1a299ff41160d8fedbd4abc29b9 to before 6e76e9ed273dfb4b3333a5ebbb94958cc5752ab6Affected
LinuxLinux	5.2Affected before 5.2Not affected 5.10.261 through 5.10.Not affected 5.15.212 through 5.15.Not affected 6.1.178 through 6.1.Not affected 6.6.145 through 6.6.Not affected 6.12.97 through 6.12.Not affected 6.18.40 through 6.18.Not affected 7.1.5 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

e3037485c68ec1a299ff41160d8fedbd4abc29b9 to before 913bd7d3d3d842b5c1d2b908a0201efa8fc79793Affected
e3037485c68ec1a299ff41160d8fedbd4abc29b9 to before 45abc14ab3f15da7d689f1a8809c1a01240a94d9Affected
e3037485c68ec1a299ff41160d8fedbd4abc29b9 to before 08193e733e5d4790e6c937af86d78793b02709beAffected
e3037485c68ec1a299ff41160d8fedbd4abc29b9 to before 6a3c384393d3f0b41669ed5a2e88744aad9d87c8Affected
e3037485c68ec1a299ff41160d8fedbd4abc29b9 to before 26c183a86ea4dd1f2ff90c6f783649e7f5722a10Affected
e3037485c68ec1a299ff41160d8fedbd4abc29b9 to before 01155ded5d4dad61840a9a3c33ab56778ef1f100Affected
e3037485c68ec1a299ff41160d8fedbd4abc29b9 to before 1554fa522f16ec7c5c342ad33fe734eeb6eb2452Affected
e3037485c68ec1a299ff41160d8fedbd4abc29b9 to before 6e76e9ed273dfb4b3333a5ebbb94958cc5752ab6Affected

LinuxLinux

5.2Affected
before 5.2Not affected
5.10.261 through 5.10.*Not affected
5.15.212 through 5.15.*Not affected
6.1.178 through 6.1.*Not affected
6.6.145 through 6.6.*Not affected
6.12.97 through 6.12.*Not affected
6.18.40 through 6.18.*Not affected
7.1.5 through 7.1.*Not affected
7.2 and laterNot affected

References

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