# CVE-2025-40236: linux: In the Linux kernel, the following vulnerability has been resolved:  virtio-net: zero unused hash fields  When GSO tu...

CVE-2025-40236 is fixed in linux on 1 platform by DEBIAN-CVE-2025-40236 (version 6.17.6-1), released December 4, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-40236
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 4, 2025

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 6.17.6-1 | [DEBIAN-CVE-2025-40236](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40236.md) | Dec 4, 2025 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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