CVE-2021-47368

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinuxd4fd0404c1c95b17880f254ebfee3485693fa8ba < 4c4c3052911b577920353a7646e4883d5da40c28affected
LinuxLinuxd4fd0404c1c95b17880f254ebfee3485693fa8ba < 6c3f1b741c6c2914ea120e3a5790d3e900152f7baffected
LinuxLinuxd4fd0404c1c95b17880f254ebfee3485693fa8ba < 6f329d9da2a5ae032fcde800a99b118124ed5270affected
LinuxLinuxd4fd0404c1c95b17880f254ebfee3485693fa8ba < 7237a494decfa17d0b9d0076e6cee3235719de90affected
LinuxLinux5.1affected
LinuxLinux0 < 5.1unaffected
LinuxLinux5.4.150 <= 5.4.*unaffected
LinuxLinux5.10.70 <= 5.10.*unaffected
LinuxLinux5.14.9 <= 5.14.*unaffected
LinuxLinux5.15 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References