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CVE-2022-49002: iommu/vt-d: Fix PCI device refcount leak in dmar_dev_scope_init()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-10-21 · updated 2026-06-17

Description

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 products

• Linux kernel: from 3.15 before 4.9.335; from 4.10 before 4.14.301; from 4.15 before 4.19.268; from 4.20 before 5.4.226; from 5.5 before 5.10.158; from 5.11 before 5.15.82 — fixed in 4.14.301, 4.19.268, 4.9.335, 5.10.158, 5.15.82, 5.4.226

How to fix

Upgrade to a fixed version: Linux kernel 4.14.301, 4.19.268, 4.9.335, 5.10.158. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2a8f7b90681472948de172dbbf5a54cd342870aa
• https://git.kernel.org/stable/c/4bedbbd782ebbe7287231fea862c158d4f08a9e3
• https://git.kernel.org/stable/c/71c4a621985fc051ab86d3a86c749069a993fcb2
• https://git.kernel.org/stable/c/876d7bfb89273997056220029ff12b1c2cc4691d
• https://git.kernel.org/stable/c/a5c65cd56aed027f8a97fda8b691caaeb66d115e
• https://git.kernel.org/stable/c/bdb613ef179ad4bb9d56a2533e9b30e434f1dfb7
• https://git.kernel.org/stable/c/cbdd83bd2fd67142b03ce9dbdd1eab322ff7321f
• https://git.kernel.org/stable/c/d47bc9d7bcdbb9adc9703513d964b514fee5b0bf

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