CVE-2025-40173 (GCVE-0-2025-40173)
Vulnerability from cvelistv5 – Published: 2025-11-12 10:53 – Updated: 2026-10-15 22:02
VLAI
EPSS
VEX
Title
net/ip6_tunnel: Prevent perpetual tunnel growth
Summary
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.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 21:57 UTC
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
8eb30be0352d09165e94a41fef1c7b994dca0714 , < 566f8d5c8a443f2dd69c5460fdec43ed1c870c65
(git)
Affected: 8eb30be0352d09165e94a41fef1c7b994dca0714 , < 11f6066af3bfb8149aa16c42c0b0c5ea5b199a94 (git) Affected: 8eb30be0352d09165e94a41fef1c7b994dca0714 , < 402b6985e872b4cf394bbbf33b503947a326a6cb (git) Affected: 8eb30be0352d09165e94a41fef1c7b994dca0714 , < 10fe967efe73c610e526ff7460581610633dee9c (git) Affected: 8eb30be0352d09165e94a41fef1c7b994dca0714 , < 48294a67863c9cfa367abb66bbf0ef6548ae124f (git) Affected: 8eb30be0352d09165e94a41fef1c7b994dca0714 , < eeb4345488672584db4f8c20a1ae13a212ce31c4 (git) Affected: 8eb30be0352d09165e94a41fef1c7b994dca0714 , < b6eb25d870f1a8ae571fd3da2244b71df547824b (git) Affected: 8eb30be0352d09165e94a41fef1c7b994dca0714 , < 21f4d45eba0b2dcae5dbc9e5e0ad08735c993f16 (git) |
guessed | |
| Linux | Linux |
Affected:
4.7
Unaffected: 0 , < 4.7 (semver) Unaffected: 5.4.301 , ≤ 5.4.* (semver) Unaffected: 5.10.246 , ≤ 5.10.* (semver) Unaffected: 5.15.196 , ≤ 5.15.* (semver) Unaffected: 6.1.158 , ≤ 6.1.* (semver) Unaffected: 6.6.114 , ≤ 6.6.* (semver) Unaffected: 6.12.55 , ≤ 6.12.* (semver) Unaffected: 6.17.5 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/ip6_tunnel: Prevent perpetual tunnel growth\n\nSimilarly to ipv4 tunnel, ipv6 version updates dev-\u003eneeded_headroom, too.\nWhile ipv4 tunnel headroom adjustment growth was limited in\ncommit 5ae1e9922bbd (\"net: ip_tunnel: prevent perpetual headroom growth\"),\nipv6 tunnel yet increases the headroom without any ceiling.\n\nReflect ipv4 tunnel headroom adjustment limit on ipv6 version.\n\nCredits to Francesco Ruggeri, who was originally debugging this issue\nand wrote local Arista-specific patch and a reproducer."
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"lastModified": "2026-10-19T21:10:00.160",
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},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/b6eb25d870f1a8ae571fd3da2244b71df547824b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/eeb4345488672584db4f8c20a1ae13a212ce31c4"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Deferred"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-11-05T15:14:47+00:00",
"cve": "CVE-2025-40173",
"id": "CVE-2025-40173",
"initial_release_date": "2025-11-12T00:00:00+00:00",
"product_status:known_affected": "200",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: net/ip6_tunnel: Prevent perpetual tunnel growth",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40173.json",
"version": "3"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.