CVE-2026-74745

Technical Description

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

eth: bnxt: avoid deadlock when canceling IRQ affinity notifier

Unregistering IRQ affinity notifiers waits for the callback synchronously.

bnxt takes the netdev instance lock in the notifier (to restart the queue)

and cancels the work under the same lock. This may obviously deadlock.

Move the restart to the async service task. The queue restart isn't

super time sensitive. Store the new TPH tag, schedule the task.

Safely canceling the service task is already ironed out.

In bnxt_request_irq() the order of registering notifier, affinity and

initial TPH programming has to be inverted. I think it was racy

previously since user may trigger an update as soon as notifier

is installed.

There's a small known gap - if pcie_tph_get_cpu_st() fails at init

and the target tag is 0 we may miss programming the entry.

This does not seem worth fixing, the code has skip-on-failure

all over the place, anyway.

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