CVE-2022-49002

Summary

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

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

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() for the error path to avoid reference count leak.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux2e45528930388658603ea24d49cf52867b928d3e < d47bc9d7bcdbb9adc9703513d964b514fee5b0bfaffected
LinuxLinux2e45528930388658603ea24d49cf52867b928d3e < 71c4a621985fc051ab86d3a86c749069a993fcb2affected
LinuxLinux2e45528930388658603ea24d49cf52867b928d3e < 876d7bfb89273997056220029ff12b1c2cc4691daffected
LinuxLinux2e45528930388658603ea24d49cf52867b928d3e < cbdd83bd2fd67142b03ce9dbdd1eab322ff7321faffected
LinuxLinux2e45528930388658603ea24d49cf52867b928d3e < a5c65cd56aed027f8a97fda8b691caaeb66d115eaffected
LinuxLinux2e45528930388658603ea24d49cf52867b928d3e < bdb613ef179ad4bb9d56a2533e9b30e434f1dfb7affected
LinuxLinux2e45528930388658603ea24d49cf52867b928d3e < 2a8f7b90681472948de172dbbf5a54cd342870aaaffected
LinuxLinux2e45528930388658603ea24d49cf52867b928d3e < 4bedbbd782ebbe7287231fea862c158d4f08a9e3affected
LinuxLinux3.15affected
LinuxLinux0 < 3.15unaffected
LinuxLinux4.9.335 <= 4.9.*unaffected
LinuxLinux4.14.301 <= 4.14.*unaffected
LinuxLinux4.19.268 <= 4.19.*unaffected
LinuxLinux5.4.226 <= 5.4.*unaffected
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