🛡️ CVE-2025-68770 — kernel

bnxt_en: Fix XDP_TX path

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

bnxt_en: Fix XDP_TX path

For XDP_TX action in bnxt_rx_xdp(), clearing of the event flags is not

correct. __bnxt_poll_work() -> bnxt_rx_pkt() -> bnxt_rx_xdp() may be

looping within NAPI and some event flags may be set in earlier

iterations. In particular, if BNXT_TX_EVENT is set earlier indicating

some XDP_TX packets are ready and pending, it will be cleared if it is

XDP_TX action again. Normally, we will set BNXT_TX_EVENT again when we

successfully call __bnxt_xmit_xdp(). But if the TX ring has no more

room, the flag will not be set. This will cause the TX producer to be

ahead but the driver will not hit the TX doorbell.

For multi-buf XDP_TX, there is no need to clear the event flags and set

BNXT_AGG_EVENT. The BNXT_AGG_EVENT flag should have been set earlier in

bnxt_rx_pkt().

The visible symptom of this is that the RX ring associated with the

TX XDP ring will eventually become empty and all packets will be dropped.

Because this condition will cause the driver to not refill the RX ring

seeing that the TX ring has forever pending XDP_TX packets.

The fix is to only clear BNXT_RX_EVENT when we have successfully

called __bnxt_xmit_xdp().