CVE-2025-40173net/ip6_tunnel: Prevent perpetual tunnel growth
- 7.8HighCVSS base score
- 0.15%Exploitation in 30 daysEPSS · top 95% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 7 months later
· 7 months later
Published
- 11 months later
· 11 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Deferred | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.15% · top 95% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 8eb30be0352d09165e94a41fef1c7b994dca0714 – < 566f8d5c8a443f2dd69c5460fdec43ed1c870c65
- affected 8eb30be0352d09165e94a41fef1c7b994dca0714 – < 11f6066af3bfb8149aa16c42c0b0c5ea5b199a94
- affected 8eb30be0352d09165e94a41fef1c7b994dca0714 – < 402b6985e872b4cf394bbbf33b503947a326a6cb
- affected 8eb30be0352d09165e94a41fef1c7b994dca0714 – < 10fe967efe73c610e526ff7460581610633dee9c
- affected 8eb30be0352d09165e94a41fef1c7b994dca0714 – < 48294a67863c9cfa367abb66bbf0ef6548ae124f
- affected 8eb30be0352d09165e94a41fef1c7b994dca0714 – < eeb4345488672584db4f8c20a1ae13a212ce31c4
- affected 8eb30be0352d09165e94a41fef1c7b994dca0714 – < b6eb25d870f1a8ae571fd3da2244b71df547824b
- affected 8eb30be0352d09165e94a41fef1c7b994dca0714 – < 21f4d45eba0b2dcae5dbc9e5e0ad08735c993f16
- affected 4.7
- unaffected < 4.7
- unaffected 5.4.301 – ≤ 5.4.*
- unaffected 5.10.246 – ≤ 5.10.*
- unaffected 5.15.196 – ≤ 5.15.*
- unaffected 6.1.158 – ≤ 6.1.*
- unaffected 6.6.114 – ≤ 6.6.*
- unaffected 6.12.55 – ≤ 6.12.*
- unaffected 6.17.5 – ≤ 6.17.*
- unaffected 6.18 – ≤ *
References
References8
- https://git.kernel.org/stable/c/566f8d5c8a443f2dd69c5460fdec43ed1c870c65 (opens in a new tab)
- https://git.kernel.org/stable/c/11f6066af3bfb8149aa16c42c0b0c5ea5b199a94 (opens in a new tab)
- https://git.kernel.org/stable/c/402b6985e872b4cf394bbbf33b503947a326a6cb (opens in a new tab)
- https://git.kernel.org/stable/c/10fe967efe73c610e526ff7460581610633dee9c (opens in a new tab)
- https://git.kernel.org/stable/c/48294a67863c9cfa367abb66bbf0ef6548ae124f (opens in a new tab)
- https://git.kernel.org/stable/c/eeb4345488672584db4f8c20a1ae13a212ce31c4 (opens in a new tab)
- https://git.kernel.org/stable/c/b6eb25d870f1a8ae571fd3da2244b71df547824b (opens in a new tab)
- https://git.kernel.org/stable/c/21f4d45eba0b2dcae5dbc9e5e0ad08735c993f16 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-124910 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-40173)Record last updated .