net/ip6_tunnel: Prevent perpetual tunnel growth

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-40173
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-11-12 11:15:47 UTC
Updated2026-07-30 06:24:16 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001410000 probability, percentile 0.039040000 (date 2026-07-31)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8eb30be0352d09165e94a41fef1c7b994dca0714 566f8d5c8a443f2dd69c5460fdec43ed1c870c65 git Not specified
CNA Linux Linux affected 8eb30be0352d09165e94a41fef1c7b994dca0714 11f6066af3bfb8149aa16c42c0b0c5ea5b199a94 git Not specified
CNA Linux Linux affected 8eb30be0352d09165e94a41fef1c7b994dca0714 402b6985e872b4cf394bbbf33b503947a326a6cb git Not specified
CNA Linux Linux affected 8eb30be0352d09165e94a41fef1c7b994dca0714 10fe967efe73c610e526ff7460581610633dee9c git Not specified
CNA Linux Linux affected 8eb30be0352d09165e94a41fef1c7b994dca0714 48294a67863c9cfa367abb66bbf0ef6548ae124f git Not specified
CNA Linux Linux affected 8eb30be0352d09165e94a41fef1c7b994dca0714 eeb4345488672584db4f8c20a1ae13a212ce31c4 git Not specified
CNA Linux Linux affected 8eb30be0352d09165e94a41fef1c7b994dca0714 b6eb25d870f1a8ae571fd3da2244b71df547824b git Not specified
CNA Linux Linux affected 8eb30be0352d09165e94a41fef1c7b994dca0714 21f4d45eba0b2dcae5dbc9e5e0ad08735c993f16 git Not specified
CNA Linux Linux affected 4.7 Not specified
CNA Linux Linux unaffected 4.7 semver Not specified
CNA Linux Linux unaffected 5.4.301 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.246 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.196 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.158 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.114 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.55 6.12.* semver Not specified
CNA Linux Linux unaffected 6.17.5 6.17.* semver Not specified
CNA Linux Linux unaffected 6.18 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/566f8d5c8a443f2dd69c5460fdec43ed1c870c65 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/48294a67863c9cfa367abb66bbf0ef6548ae124f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/10fe967efe73c610e526ff7460581610633dee9c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eeb4345488672584db4f8c20a1ae13a212ce31c4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/21f4d45eba0b2dcae5dbc9e5e0ad08735c993f16 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/11f6066af3bfb8149aa16c42c0b0c5ea5b199a94 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/402b6985e872b4cf394bbbf33b503947a326a6cb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b6eb25d870f1a8ae571fd3da2244b71df547824b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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