Bug 2425086 (CVE-2022-50760)

Summary: CVE-2022-50760 kernel: Linux kernel: Resource exhaustion in amdgpu due to PCI device reference count leak
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 flaw was found in the Linux kernel's `drm/amdgpu` component. A missing call to `pci_dev_put()` in the `amdgpu_atrm_get_bios()` function leads to a PCI device reference count leak. A local attacker could exploit this to cause resource exhaustion, potentially resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2025-12-24 14:01:45 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/amdgpu: Fix PCI device refcount leak in amdgpu_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 amdgpu_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 Alexander B 2025-12-25 03:44:00 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025122455-CVE-2022-50760-b793@gregkh/T