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CVE-2022-50659: hwrng: geode - Fix PCI device refcount leak

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-09 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: hwrng: geode - Fix PCI device refcount leak 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. We add a new struct 'amd_geode_priv' to record pointer of the pci_dev and membase, and then add missing pci_dev_put() for the normal and error path.

Affected products

• Linux kernel: 2.6.18 — fixed in 6.2

How to fix

Upgrade to a fixed version: Linux kernel 6.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/19b7b85773b18457ff85a9ff4f5e2a2d4bf7ed0c
• https://git.kernel.org/stable/c/5cc818ad53df650cac8fb41d9066665366af3f03
• https://git.kernel.org/stable/c/6b9e43c4098f1310f5b4d52121d007a219fa5d43
• https://git.kernel.org/stable/c/82bd423ed977847652b2048b0f8dcf049b1847a9
• https://git.kernel.org/stable/c/874f798c2db5ad595e46982d7f727a679dacb048
• https://git.kernel.org/stable/c/88f4ea623f59155280d99d1a59a968f838472c4a
• https://git.kernel.org/stable/c/9f6ec8dc574efb7f4f3d7ee9cd59ae307e78f445
• https://git.kernel.org/stable/c/aa96aff394a511cc7bb7df08d1b8504d4d97671e
• https://git.kernel.org/stable/c/e2f44baf62567c5cfbc274974c7d96dddad53ccc

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