CVE-2026-74410
Published: August 18, 2026Last modified: August 18, 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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 8.1 |
| Attack Vector | ADJACENT_NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.182-r0) |
| 25 LTS | linux-lts | Fixed (6.12.103-r0) | |
| Stream | linux-lts | Fixed (6.18.43-r0) |
References
- https://git.kernel.org/stable/c/01155ded5d4dad61840a9a3c33ab56778ef1f100
- https://git.kernel.org/stable/c/08193e733e5d4790e6c937af86d78793b02709be
- https://git.kernel.org/stable/c/1554fa522f16ec7c5c342ad33fe734eeb6eb2452
- https://git.kernel.org/stable/c/26c183a86ea4dd1f2ff90c6f783649e7f5722a10
- https://git.kernel.org/stable/c/45abc14ab3f15da7d689f1a8809c1a01240a94d9
- https://git.kernel.org/stable/c/6a3c384393d3f0b41669ed5a2e88744aad9d87c8
- https://git.kernel.org/stable/c/6e76e9ed273dfb4b3333a5ebbb94958cc5752ab6
- https://git.kernel.org/stable/c/913bd7d3d3d842b5c1d2b908a0201efa8fc79793