CVE-2026-68373

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> wifi: at76c50x-usb: avoid length underflow in at76_guess_freq()<br /> <br /> at76_guess_freq() checks only that the received frame is at least a bare<br /> 802.11 header (24 bytes) before subtracting the fixed management-body<br /> offset:<br /> <br /> len -= el_off;<br /> <br /> For both beacon and probe response frames, el_off is 36. If the frame is<br /> shorter than el_off, subtracting it causes the calculated IE length to<br /> wrap. The length is eventually passed to cfg80211_find_elem_match() as a<br /> very large unsigned value, so the element walk runs beyond the RX skb.<br /> <br /> This path is reached from at76_rx_tasklet() while scanning. If the device<br /> delivers a truncated beacon or probe response, the oversized IE length<br /> causes an out-of-bounds read during scanning.<br /> <br /> Skip the IE lookup if the frame does not reach the variable elements,<br /> before subtracting el_off.