CVE-2025-40236
Unknown Unknown - Not Provided

BaseFortify

Publication date: 2025-12-04

Last updated on: 2025-12-04

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: virtio-net: zero unused hash fields When GSO tunnel is negotiated virtio_net_hdr_tnl_from_skb() tries to initialize the tunnel metadata but forget to zero unused rxhash fields. This may leak information to another side. Fixing this by zeroing the unused hash fields.

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Meta Information

Published
2025-12-04
Last Modified
2025-12-04
Generated
2026-07-06
AI Q&A
2025-12-04
EPSS Evaluated
2026-07-05
NVD
CVE-2025-40236
EUVD
EUVD-2025-201223

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability occurs in the Linux kernel's virtio-net component. When Generic Segmentation Offload (GSO) tunnel is negotiated, the function virtio_net_hdr_tnl_from_skb() attempts to initialize tunnel metadata but fails to zero out unused receive hash (rxhash) fields. As a result, these uninitialized fields may leak information from one side to another.

Impact Analysis

The vulnerability can lead to information leakage through uninitialized hash fields in the network tunnel metadata. This could potentially expose sensitive data to unauthorized parties communicating over the network.

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