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VULNERABILITIES

CVE-2025-40173 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

In the Linux kernel, the following vulnerability has been resolved: net/ip6_tunnel: Prevent perpetual tunnel growth Similarly to ipv4 tunnel, ipv6 version updates dev->needed_headroom, too. While ipv4 tunnel headroom adjustment growth was limited in commit 5ae1e9922bbd ("net: ip_tunnel: prevent perpetual headroom growth"), ipv6 tunnel yet increases the headroom without any ceiling. Reflect ipv4 tunnel headroom adjustment limit on ipv6 version. Credits to Francesco Ruggeri, who was originally debugging this issue and wrote local Arista-specific patch and a reproducer.

Metrics

CVSS 3.x Severity and Vector Strings:

NDDVolerionCVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA: kernel.orgCVSS-B:7.8 HIGHVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References 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.

URLSource(s)Tag(s)
https://git.kernel.org/stable/c/10fe967efe73c610e526ff7460581610633dee9c kernel.orgSource CodeVendor
https://git.kernel.org/stable/c/11f6066af3bfb8149aa16c42c0b0c5ea5b199a94 kernel.orgSource CodeVendor
https://git.kernel.org/stable/c/21f4d45eba0b2dcae5dbc9e5e0ad08735c993f16 kernel.orgSource CodeVendor
https://git.kernel.org/stable/c/402b6985e872b4cf394bbbf33b503947a326a6cb kernel.orgSource CodeVendor
https://git.kernel.org/stable/c/48294a67863c9cfa367abb66bbf0ef6548ae124f kernel.orgSource CodeVendor

see all 8 references

Weakness Enumeration

No weakness enumeration is available for this CVE.

Affected Products

ProductVersions
Linux kernel
All versions

CPE

  • cpe:2.3:o:kernel:linux_kernel:*:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:kernel:*:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:endpoint_security_linux_threat_prevention:*:*
  • cpe:2.3:a:linux:linux_kernel:*:*:*:*:*:*:*:*

Remediation

Change History

3 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2025-40173
NVD Published Date:
Nov 12, 2025
NVD Last Modified:
Jul 30, 2026
Source:
kernel.org
CVE-2025-40173 Details - Not Deferred