CVE-2022-50003

/// Technical description

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

ice: xsk: prohibit usage of non-balanced queue id

Fix the following scenario:

1. ethtool -L $IFACE rx 8 tx 96

2. xdpsock -q 10 -t -z

Above refers to a case where user would like to attach XSK socket in

txonly mode at a queue id that does not have a corresponding Rx queue.

At this moment ice's XSK logic is tightly bound to act on a "queue pair",

e.g. both Tx and Rx queues at a given queue id are disabled/enabled and

both of them will get XSK pool assigned, which is broken for the presented

queue configuration. This results in the splat included at the bottom,

which is basically an OOB access to Rx ring array.

To fix this, allow using the ids only in scope of "combined" queues

reported by ethtool. However, logic should be rewritten to allow such

configurations later on, which would end up as a complete rewrite of the

control path, so let us go with this temporary fix.

[420160.558008] BUG: kernel NULL pointer derefer

/// 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