CVE-2026-72055

net: ip6_vti: require CAP_NET_ADMIN in the device netns for changelink

State: Published
Severity: 8.8 High
Published: Aug 15, 2026
Updated: Oct 19, 2026
Reserved: Aug 9, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H	Linux

Weaknesses

CWE-862 Missing Authorization

Affected Products

Product	Versions
LinuxLinux	61220ab349485d911083d0b7990ccd3db6c63297 to before f5254e7766b4ac02b66b2ccef896cd278503cb11Affected 61220ab349485d911083d0b7990ccd3db6c63297 to before ef897249dc957089e6f7f11ceea699e093ad51bdAffected 61220ab349485d911083d0b7990ccd3db6c63297 to before f6e8b52a2cb3bbd72ddc2d44e474b907b9dcf5baAffected 61220ab349485d911083d0b7990ccd3db6c63297 to before c64b9ae7eb97e81d54b792910a3aeafd92566c79Affected 61220ab349485d911083d0b7990ccd3db6c63297 to before b2b61c540571b3cc2f461e2a579ba2cc8c2a52cfAffected 61220ab349485d911083d0b7990ccd3db6c63297 to before 0b2f9c908f930ec4be17d389723f9a202d6a883cAffected 61220ab349485d911083d0b7990ccd3db6c63297 to before f97e93ebf2f9b8ef3b87f7a9371255e84d151587Affected 61220ab349485d911083d0b7990ccd3db6c63297 to before e2ac3b242c37dff323a964962e43854f4b1a2b79Affected
LinuxLinux	3.15Affected before 3.15Not affected 5.10.261 through 5.10.Not affected 5.15.212 through 5.15.Not affected 6.1.178 through 6.1.Not affected 6.6.145 through 6.6.Not affected 6.12.97 through 6.12.Not affected 6.18.40 through 6.18.Not affected 7.1.5 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

61220ab349485d911083d0b7990ccd3db6c63297 to before f5254e7766b4ac02b66b2ccef896cd278503cb11Affected
61220ab349485d911083d0b7990ccd3db6c63297 to before ef897249dc957089e6f7f11ceea699e093ad51bdAffected
61220ab349485d911083d0b7990ccd3db6c63297 to before f6e8b52a2cb3bbd72ddc2d44e474b907b9dcf5baAffected
61220ab349485d911083d0b7990ccd3db6c63297 to before c64b9ae7eb97e81d54b792910a3aeafd92566c79Affected
61220ab349485d911083d0b7990ccd3db6c63297 to before b2b61c540571b3cc2f461e2a579ba2cc8c2a52cfAffected
61220ab349485d911083d0b7990ccd3db6c63297 to before 0b2f9c908f930ec4be17d389723f9a202d6a883cAffected
61220ab349485d911083d0b7990ccd3db6c63297 to before f97e93ebf2f9b8ef3b87f7a9371255e84d151587Affected
61220ab349485d911083d0b7990ccd3db6c63297 to before e2ac3b242c37dff323a964962e43854f4b1a2b79Affected

LinuxLinux

3.15Affected
before 3.15Not affected
5.10.261 through 5.10.*Not affected
5.15.212 through 5.15.*Not affected
6.1.178 through 6.1.*Not affected
6.6.145 through 6.6.*Not affected
6.12.97 through 6.12.*Not affected
6.18.40 through 6.18.*Not affected
7.1.5 through 7.1.*Not affected
7.2 and laterNot affected

References

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