---
id: CVE-2026-68294
title: 'net: qrtr: restrict socket creation to the initial network namespace'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: qrtr: restrict socket creation to the initial network namespace

  QRTR keeps its entire port and node state in module-global variables
  that are not partitioned per …
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= bdabad3e363d825ddf9679dd431cca0b2c30f881 <
    7814f6a3415cad38aa8d6dfc573df778260d66aa
  - >-
    Linux >= bdabad3e363d825ddf9679dd431cca0b2c30f881 <
    2d22b94a154ccb9755dddfff802fe3e2b1adbab5
  - >-
    Linux >= bdabad3e363d825ddf9679dd431cca0b2c30f881 <
    8d351fe0654a20c9f95a61b05d24ebe6d4be3fbb
  - >-
    Linux >= bdabad3e363d825ddf9679dd431cca0b2c30f881 <
    4b95e1f0d6e6342c427cb341ee18a894b146b789
  - >-
    Linux >= bdabad3e363d825ddf9679dd431cca0b2c30f881 <
    f488116df769bdaf89c93371350e49e12133e70f
  - >-
    Linux >= bdabad3e363d825ddf9679dd431cca0b2c30f881 <
    8150c48fb978e01689f94ed80148f8a7499ae571
  - >-
    Linux >= bdabad3e363d825ddf9679dd431cca0b2c30f881 <
    659b9b4f194bb56b9903cc95e786ef1d438baa7d
  - >-
    Linux >= bdabad3e363d825ddf9679dd431cca0b2c30f881 <
    3b536db8fb32da9e9c62f2bb45e2e319331f0426
  - Linux 4.7
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T15:46:44.239269Z'
published: '2026-08-10'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:53:06.763Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-68294'
references:
  - url: 'https://git.kernel.org/stable/c/7814f6a3415cad38aa8d6dfc573df778260d66aa'
  - url: 'https://git.kernel.org/stable/c/2d22b94a154ccb9755dddfff802fe3e2b1adbab5'
  - url: 'https://git.kernel.org/stable/c/8d351fe0654a20c9f95a61b05d24ebe6d4be3fbb'
  - url: 'https://git.kernel.org/stable/c/4b95e1f0d6e6342c427cb341ee18a894b146b789'
  - url: 'https://git.kernel.org/stable/c/f488116df769bdaf89c93371350e49e12133e70f'
  - url: 'https://git.kernel.org/stable/c/8150c48fb978e01689f94ed80148f8a7499ae571'
  - url: 'https://git.kernel.org/stable/c/659b9b4f194bb56b9903cc95e786ef1d438baa7d'
  - url: 'https://git.kernel.org/stable/c/3b536db8fb32da9e9c62f2bb45e2e319331f0426'
tags:
  - cve.org
epss: 0.00169
epssPercentile: 0.05793
ingestedAt: '2026-10-16T17:24:46.855Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

net: qrtr: restrict socket creation to the initial network namespace

QRTR keeps its entire port and node state in module-global variables
that are not partitioned per network namespace: qrtr_local_nid is a
single global node id (always 1) and qrtr_ports is a single global
xarray. qrtr_port_lookup() and qrtr_local_enqueue() operate on that
global state with no network-namespace check, and qrtr_create() places
no restriction on the namespace a socket is created in.

As a result an unprivileged process that creates an AF_QIPCRTR socket
in a separate network namespace, e.g. via
unshare(CLONE_NEWUSER | CLONE_NEWNET), can send QRTR datagrams -
including control-plane messages such as QRTR_TYPE_NEW_SERVER - to QRTR
sockets owned by another namespace, and vice versa. The receiving
socket sees such a message as coming from node id 1, indistinguishable
from a legitimate local client, breaking the isolation that network
namespaces are expected to provide.

QRTR is a transport to global hardware endpoints (the modem and other
remote processors) and has no per-namespace semantics; its in-kernel
name service already creates its socket in init_net only. Confine the
socket family to the initial network namespace, as other
non-namespace-aware socket families do (see llc_ui_create() and the
ieee802154 socket code).

## Affected

- `Linux >= bdabad3e363d825ddf9679dd431cca0b2c30f881 < 7814f6a3415cad38aa8d6dfc573df778260d66aa`
- `Linux >= bdabad3e363d825ddf9679dd431cca0b2c30f881 < 2d22b94a154ccb9755dddfff802fe3e2b1adbab5`
- `Linux >= bdabad3e363d825ddf9679dd431cca0b2c30f881 < 8d351fe0654a20c9f95a61b05d24ebe6d4be3fbb`
- `Linux >= bdabad3e363d825ddf9679dd431cca0b2c30f881 < 4b95e1f0d6e6342c427cb341ee18a894b146b789`
- `Linux >= bdabad3e363d825ddf9679dd431cca0b2c30f881 < f488116df769bdaf89c93371350e49e12133e70f`
- `Linux >= bdabad3e363d825ddf9679dd431cca0b2c30f881 < 8150c48fb978e01689f94ed80148f8a7499ae571`
- `Linux >= bdabad3e363d825ddf9679dd431cca0b2c30f881 < 659b9b4f194bb56b9903cc95e786ef1d438baa7d`
- `Linux >= bdabad3e363d825ddf9679dd431cca0b2c30f881 < 3b536db8fb32da9e9c62f2bb45e2e319331f0426`
- `Linux 4.7`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.