CVE-2022-48941

/// Technical description

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

ice: fix concurrent reset and removal of VFs

Commit c503e63200c6 ("ice: Stop processing VF messages during teardown")

introduced a driver state flag, ICE_VF_DEINIT_IN_PROGRESS, which is

intended to prevent some issues with concurrently handling messages from

VFs while tearing down the VFs.

This change was motivated by crashes caused while tearing down and

bringing up VFs in rapid succession.

It turns out that the fix actually introduces issues with the VF driver

caused because the PF no longer responds to any messages sent by the VF

during its .remove routine. This results in the VF potentially removing

its DMA memory before the PF has shut down the device queues.

Additionally, the fix doesn't actually resolve concurrency issues within

the ice driver. It is possible for a VF to initiate a reset just prior

to the ice driver removing VFs. This can result in the remove task

concurrently operating while the VF is bein

/// 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