CVE-2026-53075

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-53075

Key Details

CVE	CVE-2026-53075
CVSS Score / Version	8.8 (High) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is changed; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-53075
CVE	https://www.cve.org/CVERecord?id=CVE-2026-53075

Source

Reference

NVD

CVE