CVE-2026-68373

Status: UPDATED  |  Advisory ID: CVE-2026-68373

Key Details

Affected Products, Subsystems & Sectors

What to Know

In the Linux kernel, the following vulnerability has been resolved:

wifi: at76c50x-usb: avoid length underflow in at76_guess_freq()

at76_guess_freq() checks only that the received frame is at least a bare

802.11 header (24 bytes) before subtracting the fixed management-body

offset:

len -= el_off;

For both beacon and probe response frames, el_off is 36. If the frame is

shorter than el_off, subtracting it causes the calculated IE length to

wrap. The length is eventually passed to cfg80211_find_elem_match() as a

very large unsigned value, so the element walk runs beyond the RX skb.

This path is reached from at76_rx_tasklet() while scanning. If the device

delivers a truncated beacon or probe response, the oversized IE length

causes an out-of-bounds read during scanning.

Skip the IE lookup if the frame does not reach the variable elements,

before subtracting el_off. (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References