CVE-2023-53746

/// Technical description

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

s390/vfio-ap: fix memory leak in vfio_ap device driver

The device release callback function invoked to release the matrix device

uses the dev_get_drvdata(device *dev) function to retrieve the

pointer to the vfio_matrix_dev object in order to free its storage. The

problem is, this object is not stored as drvdata with the device; since the

kfree function will accept a NULL pointer, the memory for the

vfio_matrix_dev object is never freed.

Since the device being released is contained within the vfio_matrix_dev

object, the container_of macro will be used to retrieve its pointer.

/// 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