CVE-2025-38020

/// Technical description

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

net/mlx5e: Disable MACsec offload for uplink representor profile

MACsec offload is not supported in switchdev mode for uplink

representors. When switching to the uplink representor profile, the

MACsec offload feature must be cleared from the netdevice's features.

If left enabled, attempts to add offloads result in a null pointer

dereference, as the uplink representor does not support MACsec offload

even though the feature bit remains set.

Clear NETIF_F_HW_MACSEC in mlx5e_fix_uplink_rep_features().

Kernel log:

Oops: general protection fault, probably for non-canonical address 0xdffffc000000000f: 0000 [#1] SMP KASAN

KASAN: null-ptr-deref in range [0x0000000000000078-0x000000000000007f]

CPU: 29 UID: 0 PID: 4714 Comm: ip Not tainted 6.14.0-rc4_for_upstream_debug_2025_03_02_17_35 #1

Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014

RIP: 0010:__mutex_lock+0

/// 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