CVE-2024-42082

/// Technical description

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

xdp: Remove WARN() from __xdp_reg_mem_model()

syzkaller reports a warning in __xdp_reg_mem_model().

The warning occurs only if __mem_id_init_hash_table() returns an error. It

returns the error in two cases:

1. memory allocation fails;

2. rhashtable_init() fails when some fields of rhashtable_params

struct are not initialized properly.

The second case cannot happen since there is a static const rhashtable_params

struct with valid fields. So, warning is only triggered when there is a

problem with memory allocation.

Thus, there is no sense in using WARN() to handle this error and it can be

safely removed.

WARNING: CPU: 0 PID: 5065 at net/core/xdp.c:299 __xdp_reg_mem_model+0x2d9/0x650 net/core/xdp.c:299

CPU: 0 PID: 5065 Comm: syz-executor883 Not tainted 6.8.0-syzkaller-05271-gf99c5f563c17 #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024

RIP: 0010:__xdp_reg_mem_mo

/// 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