CVE-2022-50576
Published Oct 22, 2025
Modified Apr 15, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: serial: pch: Fix PCI device refcount leak in pch_request_dma() As comment of pci_get_slot() says, it returns a pci_device with its refcount increased. The caller must decrement the reference count by calling pci_dev_put(). Since 'dma_dev' is only used to filter the channel in filter(), we can call pci_dev_put() before exiting from pch_request_dma(). Add the missing pci_dev_put() for the normal and error path.
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References
Other References
https://git.kernel.org/stable/c/07f4ca68b0f6bf84b6b391c14b59fd179fcde9c5
https://git.kernel.org/stable/c/4f5d28865c665c9064de631a518f9bc8099d9ce4
https://git.kernel.org/stable/c/516614a371c26e3334625b4bca19a5362bf658d6
https://git.kernel.org/stable/c/56e5a7c5ee3f0dc8978b5df2b1a98a1b060c5e2a
https://git.kernel.org/stable/c/6f7d82380fbeaed3a940efc33c23f0c4bbd0fc02
https://git.kernel.org/stable/c/8be3a7bf773700534a6e8f87f6ed2ed111254be5
https://git.kernel.org/stable/c/90ff030ca10b69feeebda1427550ebf9ed2ad868
https://git.kernel.org/stable/c/d165388227aa7e46a9751b90bae6337b5335cdbb
https://git.kernel.org/stable/c/dfd15c5550b9190d5b0f9bcacb3e6436322f3854
Frequently Asked Questions
What is CVE-2022-50576? +
In the Linux kernel, the following vulnerability has been resolved:
serial: pch: Fix PCI device refcount leak in pch_request_dma()
As comment of pci_get_slot() says, it returns a pci_device with its
refcount increased. The caller must decrement the reference count by
calling pci_dev_put().
Since 'dma_dev' is only used to filter the channel in filter(), we can
call pci_dev_put() before exiting from pch_request_dma(). Add the
missing pci_dev_put() for the normal and error path.
How do I check if I'm vulnerable to CVE-2022-50576? +
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.