CVE-2026-46165

Technical Description

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

openvswitch: vport: fix self-deadlock on release of tunnel ports

vports are used concurrently and protected by RCU, so netdev_put()

must happen after the RCU grace period. So, either in an RCU call or

after the synchronize_net(). The rtnl_delete_link() must happen under

RTNL and so can't be executed in RCU context. Calling synchronize_net()

while holding RTNL is not a good idea for performance and system

stability under load in general, so calling netdev_put() in RCU call

is the right solution here.

However,

when the device is deleted, rtnl_unlock() will call netdev_run_todo()

and block until all the references are gone. In the current code this

means that we never reach the call_rcu() and the vport is never freed

and the reference is never released, causing a self-deadlock on device

removal.

Fix that by moving the rcu_call() before the rtnl_unlock(), so the

scheduled RCU callback will be executed when synchron

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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.

Affected Products

References