net/ip6_tunnel: Prevent perpetual tunnel growth
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.
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