CVE-2025-40173net/ip6_tunnel: Prevent perpetual tunnel growth
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Deferred
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 8eb30be0352d09165e94a41fef1c7b994dca0714 before 566f8d5c8a443f2dd69c5460fdec43ed1c870c65; from 8eb30be0352d09165e94a41fef1c7b994dca0714 before 11f6066af3bfb8149aa16c42c0b0c5ea5b199a94; from 8eb30be0352d09165e94a41fef1c7b994dca0714 before 402b6985e872b4cf394bbbf33b503947a326a6cb; from 8eb30be0352d09165e94a41fef1c7b994dca0714 before 10fe967efe73c610e526ff7460581610633dee9c; from 8eb30be0352d09165e94a41fef1c7b994dca0714 before 48294a67863c9cfa367abb66bbf0ef6548ae124f; from 8eb30be0352d09165e94a41fef1c7b994dca0714 before eeb4345488672584db4f8c20a1ae13a212ce31c4; from 8eb30be0352d09165e94a41fef1c7b994dca0714 before b6eb25d870f1a8ae571fd3da2244b71df547824b; from 8eb30be0352d09165e94a41fef1c7b994dca0714 before 21f4d45eba0b2dcae5dbc9e5e0ad08735c993f16 | CNA record |
References
- https://git.kernel.org/stable/c/566f8d5c8a443f2dd69c5460fdec43ed1c870c65
- https://git.kernel.org/stable/c/11f6066af3bfb8149aa16c42c0b0c5ea5b199a94
- https://git.kernel.org/stable/c/402b6985e872b4cf394bbbf33b503947a326a6cb
- https://git.kernel.org/stable/c/10fe967efe73c610e526ff7460581610633dee9c
- https://git.kernel.org/stable/c/48294a67863c9cfa367abb66bbf0ef6548ae124f
- https://git.kernel.org/stable/c/eeb4345488672584db4f8c20a1ae13a212ce31c4
- https://git.kernel.org/stable/c/b6eb25d870f1a8ae571fd3da2244b71df547824b
- https://git.kernel.org/stable/c/21f4d45eba0b2dcae5dbc9e5e0ad08735c993f16
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.