CVE-2026-97955

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

net: mana: restore the XDP program pointer when pre-allocation fails

mana xdp set() publishes the new program into apc->bpf prog before it allocates anything, because mana pre alloc rxbufs() sizes the buffers from it via mana get rxbuf cfg(). When that allocation fails the function returns the error directly, skipping the err dealloc rxbuffs label which is the only place that restores the previous pointer.

The attach is reported as failed, so the BPF core drops the reference it held for the caller and the program can be freed, while apc->bpf prog still points at it. The next consumer of mana xdp get() - typically mana chn setxdp() from mana alloc queues() on the following ifup, or after a TX timeout reset - then calls bpf prog add() on freed memory.

This is reachable from an ordinary "ip link set dev ethX xdp obj ..." whenever the per-queue RX buffer pre-allocation cannot be satisfied.

Restore the previous program on that error path.