Bug 2402219 (CVE-2022-50520)

Summary: CVE-2022-50520 kernel: drm/radeon: Fix PCI device refcount leak in radeon_atrm_get_bios()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A reference leak flaw was found in the Linux kernel's Radeon graphics driver in the BIOS retrieval logic. A local user on systems with AMD Radeon graphics hardware can trigger this issue when the driver searches for ACPI firmware tables and exits the search loop with an acquired PCI device reference that is never released. This results in a permanent reference leak preventing proper device cleanup and leading to resource exhaustion or denial of service.
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Description OSIDB Bzimport 2025-10-07 16:03:39 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/radeon: Fix PCI device refcount leak in radeon_atrm_get_bios()

As comment of pci_get_class() says, it returns a pci_device with its
refcount increased and decreased the refcount for the input parameter
@from if it is not NULL.

If we break the loop in radeon_atrm_get_bios() with 'pdev' not NULL, we
need to call pci_dev_put() to decrease the refcount. Add the missing
pci_dev_put() to avoid refcount leak.
Comment 1 Jon Moroney 2025-10-07 18:07:43 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100704-CVE-2022-50520-9faa@gregkh/T