CVE-2026-68294
Received Received - Intake

Network Namespace Bypass in Linux Kernel QRTR

Publication date: 2026-08-10

Last updated on: 2026-08-10

Assigner: kernel.org

Description
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).

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Meta Information

Published
2026-08-10
Last Modified
2026-08-10
Generated
2026-08-10
AI Q&A
2026-08-10
EPSS Evaluated
N/A
NVD
CVE-2026-68294
EUVD
EUVD-2026-55395

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel allows unprivileged processes in separate network namespaces to create AF_QIPCRTR sockets and send datagrams, including control messages, across namespace boundaries. The issue arises because QRTR (Qualcomm IPC Router) uses global variables for port and node state instead of per-namespace isolation, breaking expected network namespace isolation.

Detection Guidance

Detecting this vulnerability requires checking for AF_QIPCRTR socket usage across network namespaces. Inspect active sockets with 'ss -x' or 'netstat -x' and verify if sockets exist outside the initial network namespace. Look for processes using unshare with CLONE_NEWNET or CLONE_NEWUSER flags.

Impact Analysis

An attacker could exploit this to send unauthorized messages to QRTR sockets in other namespaces, potentially interfering with inter-process communication or gaining access to sensitive data. This could lead to privilege escalation or denial of service within the affected system.

Mitigation Strategies

Apply the Linux kernel patch addressing this issue. Restrict AF_QIPCRTR socket creation to the initial network namespace by updating kernel configurations. Monitor for unauthorized socket creation attempts in non-initial namespaces.

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