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CVE-2025-38200 is an integer-underflow vulnerability in the Linux kernel Intel i40e Ethernet driver, in i40e_clear_hw. A device-provided input can cause a related value to underflow, resulting in an MMIO write targeting an invalid page. The upstream fix changes the types of the affected variables to prevent the underflow.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
19 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.
A Linux kernel i40e Ethernet-driver flaw permitting MMIO write access to an invalid page in i40e_clear_hw.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.