CVE-2024-27014

/// Technical description

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

net/mlx5e: Prevent deadlock while disabling aRFS

When disabling aRFS under the `priv->state_lock`, any scheduled

aRFS works are canceled using the `cancel_work_sync` function,

which waits for the work to end if it has already started.

However, while waiting for the work handler, the handler will

try to acquire the `state_lock` which is already acquired.

The worker acquires the lock to delete the rules if the state

is down, which is not the worker's responsibility since

disabling aRFS deletes the rules.

Add an aRFS state variable, which indicates whether the aRFS is

enabled and prevent adding rules when the aRFS is disabled.

Kernel log:

======================================================

WARNING: possible circular locking dependency detected

6.7.0-rc4_net_next_mlx5_5483eb2 #1 Tainted: G I

------------------------------------------------------

ethtool/386089 is trying to acquire lock:

ffff88810f21ce68 (

/// 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