CVE-2025-40173High· 7.8▾ TwilightIn 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 …
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 15.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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.
Linux >= 8eb30be0352d09165e94a41fef1c7b994dca0714 < 566f8d5c8a443f2dd69c5460fdec43ed1c870c65Linux >= 8eb30be0352d09165e94a41fef1c7b994dca0714 < 11f6066af3bfb8149aa16c42c0b0c5ea5b199a94Linux >= 8eb30be0352d09165e94a41fef1c7b994dca0714 < 402b6985e872b4cf394bbbf33b503947a326a6cbLinux >= 8eb30be0352d09165e94a41fef1c7b994dca0714 < 10fe967efe73c610e526ff7460581610633dee9cLinux >= 8eb30be0352d09165e94a41fef1c7b994dca0714 < 48294a67863c9cfa367abb66bbf0ef6548ae124fLinux >= 8eb30be0352d09165e94a41fef1c7b994dca0714 < eeb4345488672584db4f8c20a1ae13a212ce31c4Linux >= 8eb30be0352d09165e94a41fef1c7b994dca0714 < b6eb25d870f1a8ae571fd3da2244b71df547824bLinux >= 8eb30be0352d09165e94a41fef1c7b994dca0714 < 21f4d45eba0b2dcae5dbc9e5e0ad08735c993f16Linux 4.7Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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