CVE-2026-80753

/// Technical description

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

ovpn: run deferred work on a module-owned workqueue

ovpn queues several work items whose callbacks execute module text.

These works currently run on the global system workqueues, so module

exit has no driver-owned drain point that guarantees the callbacks have

fully returned before the module text can be freed.

Object references protect the objects used by the callbacks, but they do

not prove that a workqueue function has returned. In particular, a

worker can drop the final reference that unblocks device teardown while

it is still executing ovpn code.

Add a module-owned workqueue and queue all ovpn work items on it. During

module exit, unregister rtnl and netlink first, flush the workqueue so

ordinary ovpn workers finish, run the final RCU barrier, and destroy the

workqueue last. This keeps the workqueue available for cleanup work

queued from RCU callbacks, while ensuring no ovpn work item can outlive

the module te

/// 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