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
2026-05-07
AI Q&A
2025-12-04
EPSS Evaluated
2026-05-05
NVD
CVE-2025-40236
EUVD
EUVD-2025-201223
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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AI Powered Q&A
Can you explain this vulnerability to me?

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.


How can this vulnerability impact me? :

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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