CVE-2022-49000

Summary

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

iommu/vt-d: Fix PCI device refcount leak in has_external_pci()

for_each_pci_dev() is implemented by pci_get_device(). The comment of pci_get_device() says that it will increase the reference count for the returned pci_dev and also decrease the reference count for the input pci_dev @from if it is not NULL.

If we break for_each_pci_dev() loop with pdev not NULL, we need to call pci_dev_put() to decrease the reference count. Add the missing pci_dev_put() before 'return true' to avoid reference count leak.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux89a6079df791aeace2044ea93be1b397195824ec < 10ed7655a17f6a3eaecd1293830488259ccd5723affected
LinuxLinux89a6079df791aeace2044ea93be1b397195824ec < b6eea8b2e858a20ad58ac62dc2de90fea2413f94affected
LinuxLinux89a6079df791aeace2044ea93be1b397195824ec < 17f67414718e6aba123335a33b7d15aa594fff34affected
LinuxLinux89a6079df791aeace2044ea93be1b397195824ec < afca9e19cc720bfafc75dc5ce429c185ca93f31daffected
LinuxLinux5.0affected
LinuxLinux0 < 5.0unaffected
LinuxLinux5.10.158 <= 5.10.*unaffected
LinuxLinux5.15.82 <= 5.15.*unaffected
LinuxLinux6.0.12 <= 6.0.*unaffected
LinuxLinux6.1 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

References