CVE-2022-49002: linux kernel — Fix

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.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor	Product	Versions
linux	linux_kernel	3.15 — 4.9.335
linux	linux_kernel	4.10 — 4.14.301
linux	linux_kernel	4.15 — 4.19.268
linux	linux_kernel	4.20 — 5.4.226
linux	linux_kernel	5.5 — 5.10.158
linux	linux_kernel	5.11 — 5.15.82
linux	linux_kernel	5.16 — 6.0.12
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

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

Frequently Asked Questions

What is CVE-2022-49002? +

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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-49002? +

CVE-2022-49002 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2022-49002? +

CVE-2022-49002 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2022-49002? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2022-49002