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7.1 High

CVE-2021-47368 In the Linux kernel, the following vulnerability has been resolved: enetc: Fix illegal access when reading affinity_hint…

Description

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 and versions

Product Affected versions Fixed in
Linux 5.15 earliest → < 5.15 5.15
Linux 5.14 earliest → < 5.14.9 5.14.9
Linux 5.10 earliest → < 5.10.70 5.10.70
Linux 5.4 earliest → < 5.4.150 5.4.150
Linux 5.1 No fix stated
linux_kernel 5.15 earliest → < 5.15 5.15

References

Timeline

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