CVE-2026-72061

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

ipip6_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 ipip6_changelink() on rtnl_dev_link_net_capable() at its top, before any attribute is parsed. sit was the one tunnel type not covered by the recent series that added this check to the other changelink() handlers.

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	5e6700b3bf98fe98d630bf9c939ad4c85ce95592 to before cb41b308e9d867725d965b291dd085028e36a480Affected 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 to before c5a0ae895432596b2f464172da8218e2d84e2932Affected 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 to before 7d139dec96691cde96cb40ed293e2d13d994fb4fAffected 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 to before 388ccffbd2e7e5e4271f291085a7451865705305Affected 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 to before c0ea1aedb37bb979e864ed7787975434bbd9db73Affected 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 to before 3118e97dae533fb45964b87bbed1801afcff7c65Affected 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 to before 99ae3248b33df94201915d9c32e7470cdf08cfcdAffected 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 to before 27ccb68e7cccead5d8c611665a45d23032d468b3Affected
LinuxLinux	3.11Affected before 3.11Not 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

5e6700b3bf98fe98d630bf9c939ad4c85ce95592 to before cb41b308e9d867725d965b291dd085028e36a480Affected
5e6700b3bf98fe98d630bf9c939ad4c85ce95592 to before c5a0ae895432596b2f464172da8218e2d84e2932Affected
5e6700b3bf98fe98d630bf9c939ad4c85ce95592 to before 7d139dec96691cde96cb40ed293e2d13d994fb4fAffected
5e6700b3bf98fe98d630bf9c939ad4c85ce95592 to before 388ccffbd2e7e5e4271f291085a7451865705305Affected
5e6700b3bf98fe98d630bf9c939ad4c85ce95592 to before c0ea1aedb37bb979e864ed7787975434bbd9db73Affected
5e6700b3bf98fe98d630bf9c939ad4c85ce95592 to before 3118e97dae533fb45964b87bbed1801afcff7c65Affected
5e6700b3bf98fe98d630bf9c939ad4c85ce95592 to before 99ae3248b33df94201915d9c32e7470cdf08cfcdAffected
5e6700b3bf98fe98d630bf9c939ad4c85ce95592 to before 27ccb68e7cccead5d8c611665a45d23032d468b3Affected

LinuxLinux

3.11Affected
before 3.11Not 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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