BaseFortify

Publication date: 2025-10-15

Last updated on: 2025-10-16

Assigner: kernel.org

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.

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Meta Information

Published

2025-10-15

Last Modified

2025-10-16

Generated

2026-07-06

AI Q&A

2025-10-15

EPSS Evaluated

2026-07-05

NVD

CVE-2025-39973

EUVD

EUVD-2025-34599

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	From 5.15.160 (inc) to 5.16 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability involves the Linux kernel's i40e driver where the 'ring_len' parameter provided by a virtual function (VF) was assigned directly to the hardware memory context (HMC) without validation. This could allow invalid or malicious values to be used. The fix introduced validation by adding an upper boundary check for both transmit (Tx) and receive (Rx) queue lengths, limiting them to a maximum supported by the hardware (8k-32 descriptors), and enforcing alignment constraints (Tx rings must be multiples of 8, Rx rings multiples of 32).

Impact Analysis

If exploited, this vulnerability could allow a virtual function to set invalid or out-of-bound ring lengths, potentially causing hardware memory corruption, instability, or denial of service in the network driver. This could impact system reliability and network performance.

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