CVE-2026-72061
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.
How to fix
- Linux Linuxcb41b308e9d867725d965b291dd085028e36a480, c5a0ae895432596b2f464172da8218e2d84e2932, 7d139dec96691cde96cb40ed293e2d13d994fb4f, 388ccffbd2e7e5e4271f291085a7451865705305, c0ea1aedb37bb979e864ed7787975434bbd9db73, 3118e97dae533fb45964b87bbed1801afcff7c65, 99ae3248b33df94201915d9c32e7470cdf08cfcd, 27ccb68e7cccead5d8c611665a45d23032d468b3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 ≤ v < cb41b308e9d867725d965b291dd085028e36a480, 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 ≤ v < c5a0ae895432596b2f464172da8218e2d84e2932, 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 ≤ v < 7d139dec96691cde96cb40ed293e2d13d994fb4f, 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 ≤ v < 388ccffbd2e7e5e4271f291085a7451865705305, 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 ≤ v < c0ea1aedb37bb979e864ed7787975434bbd9db73, 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 ≤ v < 3118e97dae533fb45964b87bbed1801afcff7c65, 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 ≤ v < 99ae3248b33df94201915d9c32e7470cdf08cfcd, 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 ≤ v < 27ccb68e7cccead5d8c611665a45d23032d468b3, 3.11 | cb41b308e9d867725d965b291dd085028e36a480, c5a0ae895432596b2f464172da8218e2d84e2932, 7d139dec96691cde96cb40ed293e2d13d994fb4f, 388ccffbd2e7e5e4271f291085a7451865705305, c0ea1aedb37bb979e864ed7787975434bbd9db73, 3118e97dae533fb45964b87bbed1801afcff7c65, 99ae3248b33df94201915d9c32e7470cdf08cfcd, 27ccb68e7cccead5d8c611665a45d23032d468b3 |
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