Description
In the Linux kernel, the following vulnerability has been resolved: ppp: require CAP_NET_ADMIN in target netns for unattached ioctls /dev/ppp open is currently authorized against file->f_cred->user_ns, while unattached administrative ioctls operate on current->nsproxy->net_ns. As a result, a local unprivileged user can create a new user namespace with CLONE_NEWUSER, gain CAP_NET_ADMIN only in that new user namespace, and still issue PPPIOCNEWUNIT, PPPIOCATTACH, or PPPIOCATTCHAN against an inherited network namespace. Require CAP_NET_ADMIN in the user namespace that owns the target network namespace before handling unattached PPP administrative ioctls. This preserves normal pppd operation in the network namespace it is actually privileged in, while rejecting the userns-only inherited-netns case.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | 273ec51dd7ceaa76e038875d85061ec856d8905e to <c9edd90c57ae23692fff6b049fdfa4572a9fd532; 273ec51dd7ceaa76e038875d85061ec856d8905e to <5080e188c914110034bbc569d5cfa2f06204681d; 273ec51dd7ceaa76e038875d85061ec856d8905e to <67e901e28d177ac9a9bed76d69ce3471e704a89e; 273ec51dd7ceaa76e038875d85061ec856d8905e to <954745d0223e7caec917c0b2d1a889ff56fa6e54; 273ec51dd7ceaa76e038875d85061ec856d8905e to <3b2c2157dc2afc5c17cd7238afefca92f1ef330e; 273ec51dd7ceaa76e038875d85061ec856d8905e to <5013be175c7ffd8b39efbc3c9c4db5b10b85fea8; 273ec51dd7ceaa76e038875d85061ec856d8905e to <1a8a51ce85075a56a743b6f142606dd2696a391c; 273ec51dd7ceaa76e038875d85061ec856d8905e to <2bb6379416fd19f44c3423a00bfd8626259f6067 |
| Linux | Linux | 2.6.30; 0 to <2.6.30; 5.10.258 to <=5.10.*; 5.15.209 to <=5.15.*; 6.1.175 to <=6.1.*; 6.6.141 to <=6.6.*; 6.12.91 to <=6.12.*; 6.18.33 to <=6.18.*; 7.0.10 to <=7.0.*; 7.1 to <=* |
References
- https://git.kernel.org/stable/c/c9edd90c57ae23692fff6b049fdfa4572a9fd532
- https://git.kernel.org/stable/c/5080e188c914110034bbc569d5cfa2f06204681d
- https://git.kernel.org/stable/c/67e901e28d177ac9a9bed76d69ce3471e704a89e
- https://git.kernel.org/stable/c/954745d0223e7caec917c0b2d1a889ff56fa6e54
- https://git.kernel.org/stable/c/3b2c2157dc2afc5c17cd7238afefca92f1ef330e
- https://git.kernel.org/stable/c/5013be175c7ffd8b39efbc3c9c4db5b10b85fea8
- https://git.kernel.org/stable/c/1a8a51ce85075a56a743b6f142606dd2696a391c
- https://git.kernel.org/stable/c/2bb6379416fd19f44c3423a00bfd8626259f6067
Generated from the official CVE List on 25 Jun 2026 10:14 UTC.