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

net: microchip: sparx5: Fix potential null-ptr-deref in sparx_stats_init() and sparx5_start()

sparx_stats_init() calls create_singlethread_workqueue() and not
checked the ret value, which may return NULL. And a null-ptr-deref may
happen:

sparx_stats_init()
create_singlethread_workqueue() # failed, sparx5->stats_queue is NULL
queue_delayed_work()
queue_delayed_work_on()
__queue_delayed_work() # warning here, but continue
__queue_work() # access wq->flags, null-ptr-deref

Check the ret value and return -ENOMEM if it is NULL. So as
sparx5_start().

References

• https://nvd.nist.gov/vuln/detail/CVE-2022-49806
• https://git.kernel.org/stable/c/456327e565dc49d18b2f595f39f47df8a36f1057
• https://git.kernel.org/stable/c/639f5d006e36bb303f525d9479448c412b720c39
• https://git.kernel.org/stable/c/80e590aeb132887102c3fa79d99b338f099dc952