CVE-2021-47368: Linux Kernel

High severity, CVSS 7.1. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux Kernel: from 5.1, before 5.4.150 (fixed in 5.4.150); from 5.5, before 5.10.70 (fixed in 5.10.70); from 5.11, before 5.14.9 (fixed in 5.14.9); version 5.15 only

Published 2024-05-21. Last modified 2026-08-04.