What’s Vulnerable › Vulnerabilities

CVE-2026-72055: net: ip6_vti: require CAP_NET_ADMIN in the device netns for changelink

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-10-19
• Weakness: CWE-862

Description

In the Linux kernel, the following vulnerability has been resolved: net: ip6_vti: require CAP_NET_ADMIN in the device netns for changelink vti6_changelink() operates on at most two netns, dev_net(dev) and the tunnel link netns t->net. They differ once the device is created in or moved to a netns other than the one the request runs in. The rtnl changelink path checks CAP_NET_ADMIN only against dev_net(dev), so a caller privileged there but not in t->net can rewrite a tunnel that lives in t->net. Gate vti6_changelink() on rtnl_dev_link_net_capable() at its top, before any attribute is parsed.

Affected products

• Linux kernel: 3.15 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0b2f9c908f930ec4be17d389723f9a202d6a883c
• https://git.kernel.org/stable/c/b2b61c540571b3cc2f461e2a579ba2cc8c2a52cf
• https://git.kernel.org/stable/c/c64b9ae7eb97e81d54b792910a3aeafd92566c79
• https://git.kernel.org/stable/c/e2ac3b242c37dff323a964962e43854f4b1a2b79
• https://git.kernel.org/stable/c/ef897249dc957089e6f7f11ceea699e093ad51bd
• https://git.kernel.org/stable/c/f5254e7766b4ac02b66b2ccef896cd278503cb11
• https://git.kernel.org/stable/c/f6e8b52a2cb3bbd72ddc2d44e474b907b9dcf5ba
• https://git.kernel.org/stable/c/f97e93ebf2f9b8ef3b87f7a9371255e84d151587

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