CVE-2025-40236 Details
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.
A vulnerability in the Linux kernel's virtio-net implementation can lead to information leakage during GSO tunnel negotiations. The issue arises because the function 'virtio_net_hdr_tnl_from_skb()' fails to zero out unused hash fields, potentially allowing residual data to be exposed to the other side. This vulnerability affects the Linux kernel stable tree.
Users can upgrade to the latest version of the Linux kernel stable tree to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Dec 4, 2025References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/b2284768c6b32aa224ca7d0ef0741beb434f03aa | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/b625d231c66a6041e98817ffc944bf6e4c45b2e3 | kernel.org | Source CodeVendor |
Weakness Enumeration
No weakness enumeration is available for this CVE.
Affected Products
| Product | Versions |
|---|---|
| Linux kernel | All versions |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| Dec 4, 2025 | New CVE Received | kernel.org |