CVE-2024-26623

/// Technical description

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

pds_core: Prevent race issues involving the adminq

There are multiple paths that can result in using the pdsc's

adminq.

[1] pdsc_adminq_isr and the resulting work from queue_work(),

i.e. pdsc_work_thread()->pdsc_process_adminq()

[2] pdsc_adminq_post()

When the device goes through reset via PCIe reset and/or

a fw_down/fw_up cycle due to bad PCIe state or bad device

state the adminq is destroyed and recreated.

A NULL pointer dereference can happen if [1] or [2] happens

after the adminq is already destroyed.

In order to fix this, add some further state checks and

implement reference counting for adminq uses. Reference

counting was used because multiple threads can attempt to

access the adminq at the same time via [1] or [2]. Additionally,

multiple clients (i.e. pds-vfio-pci) can be using [2]

at the same time.

The adminq_refcnt is initialized to 1 when the adminq has been

allocated and is ready to use. Users/cl

/// 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