CVE-2026-72051

net: ip6_tunnel: 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_tunnel: require CAP_NET_ADMIN in the device netns for changelink

ip6_tnl_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 ip6_tnl_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	0bd8762824e73a3cce7b7560a97463301764b616 to before 2d53ee7daabe733deb81f51d2cc90188f8ad59a1Affected 0bd8762824e73a3cce7b7560a97463301764b616 to before 82e53e7281c71e174f9f5877c566a623c637b406Affected 0bd8762824e73a3cce7b7560a97463301764b616 to before 5252db8fb604321133138c7069d6fc3fcd89cdeeAffected 0bd8762824e73a3cce7b7560a97463301764b616 to before 2636d061bc237a2446a146e42dcc6563acfa7432Affected 0bd8762824e73a3cce7b7560a97463301764b616 to before 7f68f7928484f463a5bc0d50e6fdd8d16f55a5aaAffected 0bd8762824e73a3cce7b7560a97463301764b616 to before 234cd54fc500f69db43e37de38603da617fbbeeaAffected 0bd8762824e73a3cce7b7560a97463301764b616 to before d4bcc202a3530c856e1cb183384bc9cc8fddab22Affected 0bd8762824e73a3cce7b7560a97463301764b616 to before 2496fa0b7d180b3ad356b514e7ff93bb14e6140aAffected
LinuxLinux	3.12Affected before 3.12Not affected 5.10.266 through 5.10.Not affected 5.15.217 through 5.15.Not affected 6.1.184 through 6.1.Not affected 6.6.148 through 6.6.Not affected 6.12.101 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

0bd8762824e73a3cce7b7560a97463301764b616 to before 2d53ee7daabe733deb81f51d2cc90188f8ad59a1Affected
0bd8762824e73a3cce7b7560a97463301764b616 to before 82e53e7281c71e174f9f5877c566a623c637b406Affected
0bd8762824e73a3cce7b7560a97463301764b616 to before 5252db8fb604321133138c7069d6fc3fcd89cdeeAffected
0bd8762824e73a3cce7b7560a97463301764b616 to before 2636d061bc237a2446a146e42dcc6563acfa7432Affected
0bd8762824e73a3cce7b7560a97463301764b616 to before 7f68f7928484f463a5bc0d50e6fdd8d16f55a5aaAffected
0bd8762824e73a3cce7b7560a97463301764b616 to before 234cd54fc500f69db43e37de38603da617fbbeeaAffected
0bd8762824e73a3cce7b7560a97463301764b616 to before d4bcc202a3530c856e1cb183384bc9cc8fddab22Affected
0bd8762824e73a3cce7b7560a97463301764b616 to before 2496fa0b7d180b3ad356b514e7ff93bb14e6140aAffected

LinuxLinux

3.12Affected
before 3.12Not affected
5.10.266 through 5.10.*Not affected
5.15.217 through 5.15.*Not affected
6.1.184 through 6.1.*Not affected
6.6.148 through 6.6.*Not affected
6.12.101 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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