FKIE_CVE-2025-40173
Vulnerability from fkie_nvd - Published: 2025-11-12 11:15 - Updated: 2026-10-19 21:10
Severity
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.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"include/net/ip_tunnels.h",
"net/ipv4/ip_tunnel.c",
"net/ipv6/ip6_tunnel.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "566f8d5c8a443f2dd69c5460fdec43ed1c870c65",
"status": "affected",
"version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
"versionType": "git"
},
{
"lessThan": "11f6066af3bfb8149aa16c42c0b0c5ea5b199a94",
"status": "affected",
"version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
"versionType": "git"
},
{
"lessThan": "402b6985e872b4cf394bbbf33b503947a326a6cb",
"status": "affected",
"version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
"versionType": "git"
},
{
"lessThan": "10fe967efe73c610e526ff7460581610633dee9c",
"status": "affected",
"version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
"versionType": "git"
},
{
"lessThan": "48294a67863c9cfa367abb66bbf0ef6548ae124f",
"status": "affected",
"version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
"versionType": "git"
},
{
"lessThan": "eeb4345488672584db4f8c20a1ae13a212ce31c4",
"status": "affected",
"version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
"versionType": "git"
},
{
"lessThan": "b6eb25d870f1a8ae571fd3da2244b71df547824b",
"status": "affected",
"version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
"versionType": "git"
},
{
"lessThan": "21f4d45eba0b2dcae5dbc9e5e0ad08735c993f16",
"status": "affected",
"version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"include/net/ip_tunnels.h",
"net/ipv4/ip_tunnel.c",
"net/ipv6/ip6_tunnel.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.7"
},
{
"lessThan": "4.7",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.301",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.246",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.196",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.158",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.114",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.55",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.17.*",
"status": "unaffected",
"version": "6.17.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.18",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"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."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet/ip6_tunnel: Prevenir el crecimiento perpetuo del t\u00fanel\n\nDe manera similar al t\u00fanel ipv4, la versi\u00f3n ipv6 tambi\u00e9n actualiza dev-\u003eneeded_headroom.\nMientras que el crecimiento del ajuste del headroom del t\u00fanel ipv4 fue limitado en el commit 5ae1e9922bbd (\u201cnet: ip_tunnel: prevenir el crecimiento perpetuo del headroom\u201d), el t\u00fanel ipv6 a\u00fan aumenta el headroom sin ning\u00fan techo.\n\nReflejar el l\u00edmite de ajuste del headroom del t\u00fanel ipv4 en la versi\u00f3n ipv6.\n\nCr\u00e9ditos a Francesco Ruggeri, quien originalmente estaba depurando este problema y escribi\u00f3 un parche local espec\u00edfico de Arista y un reproductor."
}
],
"id": "CVE-2025-40173",
"lastModified": "2026-10-19T21:10:00.160",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2025-40173",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-15T21:57:37.658529Z",
"version": "2.0.3"
}
}
]
},
"published": "2025-11-12T11:15:47.780",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/10fe967efe73c610e526ff7460581610633dee9c"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/11f6066af3bfb8149aa16c42c0b0c5ea5b199a94"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/21f4d45eba0b2dcae5dbc9e5e0ad08735c993f16"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/402b6985e872b4cf394bbbf33b503947a326a6cb"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/48294a67863c9cfa367abb66bbf0ef6548ae124f"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/566f8d5c8a443f2dd69c5460fdec43ed1c870c65"
},
{
"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"
}
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Nomenclature
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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