CVE-2026-98615

/// Technical description

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

/// 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