CVE-2021-47325

Summary

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

iommu/arm-smmu: Fix arm_smmu_device refcount leak in address translation

The reference counting issue happens in several exception handling paths of arm_smmu_iova_to_phys_hard(). When those error scenarios occur, the function forgets to decrease the refcount of "smmu" increased by arm_smmu_rpm_get(), causing a refcount leak.

Fix this issue by jumping to "out" label when those error scenarios occur.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxd4a44f0750bb9bf7c44c22444a482756b2344a79 < b11220803ad14a2a880cc06d8e01fe2548cc85b0affected
LinuxLinuxd4a44f0750bb9bf7c44c22444a482756b2344a79 < 43d1aaa1965f9b58035196dac49b1e1e6c9c25ebaffected
LinuxLinuxd4a44f0750bb9bf7c44c22444a482756b2344a79 < 0f0c5ea09139777d90729d408b807021f2ea6492affected
LinuxLinuxd4a44f0750bb9bf7c44c22444a482756b2344a79 < 5f9741a9a91f25c89e04b408cd61e3ab050ce24baffected
LinuxLinuxd4a44f0750bb9bf7c44c22444a482756b2344a79 < 7c8f176d6a3fa18aa0f8875da6f7c672ed2a8554affected
LinuxLinux5.0affected
LinuxLinux0 < 5.0unaffected
LinuxLinux5.4.134 <= 5.4.*unaffected
LinuxLinux5.10.52 <= 5.10.*unaffected
LinuxLinux5.12.19 <= 5.12.*unaffected
LinuxLinux5.13.4 <= 5.13.*unaffected
LinuxLinux5.14 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

CVE Program Container

Additional References

References