CVE-2025-68770 bnxt_en: Fix XDP_TX path
A race condition in the bnxt_en driver's XDP_TX path can cause packet drops and RX ring exhaustion, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-68770?
CVE-2025-68770 is a high-severity vulnerability in Linux, published on 13 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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().
Weakness: CWE-667
Which versions are affected by CVE-2025-68770?
How do I fix CVE-2025-68770?
Apply the vendor's patch.
Is CVE-2025-68770 being exploited?
There is no known exploitation of CVE-2025-68770 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2025-68770, DEBIAN-CVE-2025-68770, GHSA-j6rg-wxjc-pxj8, ROOT-OS-DEBIAN-13-CVE-2025-68770, ROOT-OS-UBUNTU-2404-CVE-2025-68770, UBUNTU-CVE-2025-68770.