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CVE-2022-50520: drm/radeon: Fix PCI device refcount leak in radeon_atrm_get_bios()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-07 · updated 2026-06-17

Description

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.

Affected products

• Linux kernel: from 3.2.29 before 3.3; from 3.2.60 before 3.3; from 3.4.12 before 3.5; from 3.5.5 before 3.6; from 3.6.1 before 4.9.337; from 4.10 before 4.14.303 — fixed in 3.3, 3.5, 3.6, 4.14.303, 4.19.270, 4.9.337

How to fix

Upgrade to a fixed version: Linux kernel 3.3, 3.5, 3.6, 4.14.303. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1079df6acf56f99d86b0081a38c84701412cc90e
• https://git.kernel.org/stable/c/3991d98a8a07b71c02f3a39f77d6d9a7f575a5c4
• https://git.kernel.org/stable/c/470a77989037c3ab2b08bf2d026d2c0ddc35ff5b
• https://git.kernel.org/stable/c/6f28c7f67af4ef9bca580ab67ae2d4511797af56
• https://git.kernel.org/stable/c/725a521a18734f65de05b8d353b5bd0d3ca4c37a
• https://git.kernel.org/stable/c/88c6e0995c04b170563b5c894c50a3b2152e18c2
• https://git.kernel.org/stable/c/a6cffe54064a5f6c2162a85af3c16c6b453eac4e
• https://git.kernel.org/stable/c/b9decada8749b606fd8b4f04a3d6c74f7983d7bc
• https://git.kernel.org/stable/c/e738f82e5b1311e8fb3d1409491a6fcce6418fbe

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