IT

Tracker / CVE-2026-53075

CVE-2026-53075

High 8.8

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 and versions

linux linux_kernel · 2.6.30 → 5.10.258
linux linux_kernel · 5.11 → 5.15.209
linux linux_kernel · 5.16 → 6.1.175
linux linux_kernel · 6.13 → 6.18.33
linux linux_kernel · 6.19 → 7.0.10
linux linux_kernel · 6.2 → 6.6.141
linux linux_kernel · 6.7 → 6.12.91

Analysis

This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.

References