CVE-2026-74465

Technical Description

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

net: openvswitch: fix potential UAF on meter attach failure

While attaching a newly created meter attach_meter() function makes

the new meter visible to other CPUs but can still fail afterwards.

On failure, it detaches the meter back and returns an error.

However, this is an unexpected behavior for the ovs_meter_cmd_set()

that uses a plain kfree(meter) on attach failure without waiting for

RCU readers to stop using it, assuming it was never visible.

This is never a problem for ovs-vswitchd as it always creates meters

before creating any flows that use them. But the UAF can be triggered

with a custom application using uAPI:

BUG: KASAN: slab-use-after-free in ovs_meter_execute (net/openvswitch/meter.c:653)

Read of size 8 at addr ffff88810d152650 by task meter/2508

Call Trace:

ovs_meter_execute (net/openvswitch/meter.c:653)

do_execute_actions (net/openvswitch/actions.c:1407)

ovs_execute_actions (net/openvs

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