CVE-2026-43011

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net/x25: Fix potential double free of skb<br /> <br /> When alloc_skb fails in x25_queue_rx_frame it calls kfree_skb(skb) at<br /> line 48 and returns 1 (error).<br /> This error propagates back through the call chain:<br /> <br /> x25_queue_rx_frame returns 1<br /> |<br /> v<br /> x25_state3_machine receives the return value 1 and takes the else<br /> branch at line 278, setting queued=0 and returning 0<br /> |<br /> v<br /> x25_process_rx_frame returns queued=0<br /> |<br /> v<br /> x25_backlog_rcv at line 452 sees queued=0 and calls kfree_skb(skb)<br /> again<br /> <br /> This would free the same skb twice. Looking at x25_backlog_rcv:<br /> <br /> net/x25/x25_in.c:x25_backlog_rcv() {<br /> ...<br /> queued = x25_process_rx_frame(sk, skb);<br /> ...<br /> if (!queued)<br /> kfree_skb(skb);<br /> }