CVE-2021-47368

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

enetc: Fix illegal access when reading affinity_hint

irq_set_affinity_hit() stores a reference to the cpumask_t

parameter in the irq descriptor, and that reference can be

accessed later from irq_affinity_hint_proc_show(). Since

the cpu_mask parameter passed to irq_set_affinity_hit() has

only temporary storage (it's on the stack memory), later

accesses to it are illegal. Thus reads from the corresponding

procfs affinity_hint file can result in paging request oops.

The issue is fixed by the get_cpu_mask() helper, which provides

a permanent storage for the cpumask_t parameter.