# CVE-2022-49000: iommu/vt-d: Fix PCI device refcount leak in has\_external\_pci()

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-10-21 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 5.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
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## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/10ed7655a17f6a3eaecd1293830488259ccd5723
- https://git.kernel.org/stable/c/b6eea8b2e858a20ad58ac62dc2de90fea2413f94
- https://git.kernel.org/stable/c/17f67414718e6aba123335a33b7d15aa594fff34
- https://git.kernel.org/stable/c/afca9e19cc720bfafc75dc5ce429c185ca93f31d

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