CVE-2023-53496

/// Technical description

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

x86/platform/uv: Use alternate source for socket to node data

The UV code attempts to build a set of tables to allow it to do

bidirectional socket<=>node lookups.

But when nr_cpus is set to a smaller number than actually present, the

cpu_to_node() mapping information for unused CPUs is not available to

build_socket_tables(). This results in skipping some nodes or sockets

when creating the tables and leaving some -1's for later code to trip.

over, causing oopses.

The problem is that the socket<=>node lookups are created by doing a

loop over all CPUs, then looking up the CPU's APICID and socket. But

if a CPU is not present, there is no way to start this lookup.

Instead of looping over all CPUs, take CPUs out of the equation

entirely. Loop over all APICIDs which are mapped to a valid NUMA node.

Then just extract the socket-id from the APICID.

This avoid tripping over disabled CPUs.

/// 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