CVE-2026-98615

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

eth: fbnic: Set AW FLUSH MODE alongside AW FLUSH when flushing the mailbox

When tearing down the FW mailbox Rx ring, fbnic mbx reset desc ring() writes AW CFG with FLUSH set and everything else, BME included, cleared. Clearing BME halts the device's writes to the host but leaves the staged requests parked in the PUL write pipeline rather than draining them, so on the write path FLUSH alone never terminates the outstanding requests and the flush the firmware waits on never completes.

Add the FLUSH MODE definition and set both bits so the staged writes drain out of the pipeline on their own. BME stays cleared, so nothing lands on the host; it is restored later in fbnic mbx init desc ring() when the ring is rebuilt, once the outstanding writes are gone.

The read path is unaffected. AR CFG has no equivalent mode bit and AR FLUSH terminates the outstanding reads by itself, so it is left as is.

Both writes remain plain stores rather than read-modify-writes. That is deliberate: the matching write in fbnic mbx init desc ring() restores BME and the TLP attributes, and clears both flush bits as a side effect.