CVE-2026-31552

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

wifi: wlcore: Return -ENOMEM instead of -EAGAIN if there is not enough headroom

Since upstream commit e75665dd0968 ("wifi: wlcore: ensure skb headroom before skbpush"), wl1271txallocate() and with it wl1271preparetxframe() returns -EAGAIN if pskbexpandhead() fails. However, in wlcoretxworklocked(), a return value of -EAGAIN from wl1271preparetxframe() is interpreted as the aggregation buffer being full. This causes the code to flush the buffer, put the skb back at the head of the queue, and immediately retry the same skb in a tight while loop.

Because wlcoretxworklocked() holds wl->mutex, and the retry happens immediately with GFPATOMIC, this will result in an infinite loop and a CPU soft lockup. Return -ENOMEM instead so the packet is dropped and the loop terminates.

The problem was found by an experimental code review agent based on gemini-3.1-pro while reviewing backports into v6.18.y.