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net/ip6_tunnel: Prevent perpetual tunnel growth

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2025-40173

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2025-40173

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
        "lessThan": "566f8d5c8a443f2dd69c5460fdec43ed1c870c65",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
        "lessThan": "11f6066af3bfb8149aa16c42c0b0c5ea5b199a94",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
        "lessThan": "402b6985e872b4cf394bbbf33b503947a326a6cb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
        "lessThan": "10fe967efe73c610e526ff7460581610633dee9c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
        "lessThan": "48294a67863c9cfa367abb66bbf0ef6548ae124f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
        "lessThan": "eeb4345488672584db4f8c20a1ae13a212ce31c4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
        "lessThan": "b6eb25d870f1a8ae571fd3da2244b71df547824b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
        "lessThan": "21f4d45eba0b2dcae5dbc9e5e0ad08735c993f16",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "include/net/ip_tunnels.h",
      "net/ipv4/ip_tunnel.c",
      "net/ipv6/ip6_tunnel.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.7"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.7",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.4.301",
        "versionType": "semver",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.246",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.196",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.114",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.55",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.17.5",
        "versionType": "semver",
        "lessThanOrEqual": "6.17.*"
      },
      {
        "status": "unaffected",
        "version": "6.18",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "include/net/ip_tunnels.h",
      "net/ipv4/ip_tunnel.c",
      "net/ipv6/ip6_tunnel.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-40173

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30686 · Revision 1
Added to Heist Feed
Publisher date
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