CVE-2026-74410 wifi: rtw88: fix OOB read from firmware RX descriptor exceeding DMA buffer
An out-of-bounds read in the rtw88 PCIe WiFi driver allows attackers to read memory or cause a crash via crafted firmware descriptors.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74410?
CVE-2026-74410 is a high-severity memory corruption vulnerability in Linux, published on 15 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-74410?
How do I fix CVE-2026-74410?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-74410 being exploited?
There is no known exploitation of CVE-2026-74410 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74410, DEBIAN-CVE-2026-74410, GHSA-xfh3-hf97-85m6, UBUNTU-CVE-2026-74410.