CVE-2026-98277

/// Technical description

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

eth: fbnic: ring the doorbell if a burst ends in a drop

fbnic_tx_map() skips the doorbell write, and the completion request,

for every packet handed to it with xmit_more set, counting on the

packet which ends the burst to publish them all. When that packet is

dropped instead - skb_put_padto(), skb_cow_head() or a DMA mapping

failure - nothing rings. The descriptors of the preceding packets stay

invisible to the HW until the next transmit on that queue, which for a

burst-then-idle workload may never come.

Remember the meta descriptor of the last packet left without a doorbell

and flush it from the error paths. The completion request has to be set

on that descriptor rather than simply writing the tail, otherwise the HW

would transmit the packets but never report a head, and the ring would

fill up and stall for good.

This is very similar to Joe's recent series of fixes for bnxt.

Not seen in real life, reproduced under

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References