Linux Kernel CVE-2025-68770

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().

The Linux kernel bnxt_en driver for Broadcom NetXtreme-E/C series network controllers is affected. NVD did not publish enumerated CPE version ranges in the provided data; the three git.kernel.org stable commits (0373d5c387f2, 4b83902a1e67, f17e0c120848) identify the fix landing in mainline and being backported to stable branches, so affected versions are those stable/mainline kernels containing the XDP_TX flag-clearing logic prior to these commits. Distribution exposure is confirmed for Ubuntu via USN-8177-1 (https://ubuntu.com/security/notices/USN-8177-1). A third-party advisory is tracked at VulDB (https://vuldb.com/?id.340608). Only hosts using the bnxt_en driver with an XDP program employing XDP_TX are functionally exposed.