What’s Vulnerable › Vulnerabilities

CVE-2025-39973: i40e: add validation for ring_len param

• Severity: high (CVSS 8.8 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: 2025-10-15 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: i40e: add validation for ring_len param The `ring_len` parameter provided by the virtual function (VF) is assigned directly to the hardware memory context (HMC) without any validation. To address this, introduce an upper boundary check for both Tx and Rx queue lengths. The maximum number of descriptors supported by the hardware is 8k-32. Additionally, enforce alignment constraints: Tx rings must be a multiple of 8, and Rx rings must be a multiple of 32.

Affected products

• Linux kernel: 3.12 — fixed in 6.17

How to fix

Upgrade to a fixed version: Linux kernel 6.17. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0543d40d6513cdf1c7882811086e59a6455dfe97
• https://git.kernel.org/stable/c/05fe81fb9db20464fa532a3835dc8300d68a2f84
• https://git.kernel.org/stable/c/45a7527cd7da4cdcf3b06b5c0cb1cae30b5a5985
• https://git.kernel.org/stable/c/55d225670def06b01af2e7a5e0446fbe946289e8
• https://git.kernel.org/stable/c/7d749e38dd2b7e8a80da2ca30c93e09de95bfcf9
• https://git.kernel.org/stable/c/afec12adab55d10708179a64d95d650741e60fe0
• https://git.kernel.org/stable/c/c0c83f4cd074b75cecef107bfc349be7d516c9c4
• https://git.kernel.org/stable/c/d3b0d3f8d11fa957171fbb186e53998361a88d4e

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