CVE-2024-38557

/// Technical description

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

net/mlx5: Reload only IB representors upon lag disable/enable

On lag disable, the bond IB device along with all of its

representors are destroyed, and then the slaves' representors get reloaded.

In case the slave IB representor load fails, the eswitch error flow

unloads all representors, including ethernet representors, where the

netdevs get detached and removed from lag bond. Such flow is inaccurate

as the lag driver is not responsible for loading/unloading ethernet

representors. Furthermore, the flow described above begins by holding

lag lock to prevent bond changes during disable flow. However, when

reaching the ethernet representors detachment from lag, the lag lock is

required again, triggering the following deadlock:

Call trace:

__switch_to+0xf4/0x148

__schedule+0x2c8/0x7d0

schedule+0x50/0xe0

schedule_preempt_disabled+0x18/0x28

__mutex_lock.isra.13+0x2b8/0x570

__mutex_lock_slowpath+0x1c/0x28

mutex_lock+0x4c/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