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CVE-2025-38200 is an integer underflow vulnerability in the Linux kernel Intel i40e Ethernet driver. Specific device-provided input can trigger an underflow in i40e_clear_hw, causing a memory-mapped I/O (MMIO) write to an invalid page. The fix changes the types of related variables to prevent the underflow.
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An integer underflow in the Linux kernel's i40e_clear_hw function can cause an MMIO write to an invalid page following specific device input. The listed CVSS v3 score is 5.5, indicating a local, low-privilege vulnerability with high availability impact and no confidentiality or integrity impact. The fix changes the types of relevant variables to prevent the underflow.
Invalid-page MMIO write issue in the Linux kernel Intel i40e network driver.
Linux kernel i40e network driver invalid-page MMIO write flaw.
A Linux kernel i40e network-driver flaw involving an MMIO write to an invalid page in i40e_clear_hw.
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