---
id: CVE-2026-43041
title: 'net: qrtr: replace qrtr_tx_flow radix_tree with xarray to fix memory leak'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: qrtr: replace qrtr_tx_flow radix_tree with xarray to fix memory leak

  __radix_tree_create() allocates and links intermediate nodes into the
  tree one by one. If a s…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 5fdeb0d372ab33b4175043a2a4a1730239a217f1 <
    f2dd9aaf6e2861337f5835f877a5b2becaf4b015
  - >-
    Linux >= 5fdeb0d372ab33b4175043a2a4a1730239a217f1 <
    4b75ff0aedd6ade1018ad4a3a9d8336794e36e42
  - >-
    Linux >= 5fdeb0d372ab33b4175043a2a4a1730239a217f1 <
    ff134cc43972d7ddceff8cfd36cf6b9eaafc00b3
  - >-
    Linux >= 5fdeb0d372ab33b4175043a2a4a1730239a217f1 <
    0fda873092b541bb5a9b87d728a2429f863f8cfa
  - >-
    Linux >= 5fdeb0d372ab33b4175043a2a4a1730239a217f1 <
    69402908e277dd164bf8d7c8fd0513c0fac28e9e
  - >-
    Linux >= 5fdeb0d372ab33b4175043a2a4a1730239a217f1 <
    f2664bc4f0f356f17c2094587a2b3665e3867e44
  - >-
    Linux >= 5fdeb0d372ab33b4175043a2a4a1730239a217f1 <
    5d2249eefaca59908fe3c264b8eca526424dcfbe
  - >-
    Linux >= 5fdeb0d372ab33b4175043a2a4a1730239a217f1 <
    2428083101f6883f979cceffa76cd8440751ffe6
  - Linux 5.6
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T15:26:58.829037Z'
published: '2026-05-01'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T15:32:27.915Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-43041'
references:
  - url: 'https://git.kernel.org/stable/c/f2dd9aaf6e2861337f5835f877a5b2becaf4b015'
  - url: 'https://git.kernel.org/stable/c/4b75ff0aedd6ade1018ad4a3a9d8336794e36e42'
  - url: 'https://git.kernel.org/stable/c/ff134cc43972d7ddceff8cfd36cf6b9eaafc00b3'
  - url: 'https://git.kernel.org/stable/c/0fda873092b541bb5a9b87d728a2429f863f8cfa'
  - url: 'https://git.kernel.org/stable/c/69402908e277dd164bf8d7c8fd0513c0fac28e9e'
  - url: 'https://git.kernel.org/stable/c/f2664bc4f0f356f17c2094587a2b3665e3867e44'
  - url: 'https://git.kernel.org/stable/c/5d2249eefaca59908fe3c264b8eca526424dcfbe'
  - url: 'https://git.kernel.org/stable/c/2428083101f6883f979cceffa76cd8440751ffe6'
tags:
  - cve.org
epss: 0.00114
epssPercentile: 0.01499
ingestedAt: '2026-11-06T15:54:04.031Z'
---

## Overview

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

net: qrtr: replace qrtr_tx_flow radix_tree with xarray to fix memory leak

__radix_tree_create() allocates and links intermediate nodes into the
tree one by one. If a subsequent allocation fails, the already-linked
nodes remain in the tree with no corresponding leaf entry. These orphaned
internal nodes are never reclaimed because radix_tree_for_each_slot()
only visits slots containing leaf values.

The radix_tree API is deprecated in favor of xarray. As suggested by
Matthew Wilcox, migrate qrtr_tx_flow from radix_tree to xarray instead
of fixing the radix_tree itself [1]. xarray properly handles cleanup of
internal nodes — xa_destroy() frees all internal xarray nodes when the
qrtr_node is released, preventing the leak.

[1] https://lore.kernel.org/all/20260225071623.41275-1-jiayuan.chen@linux.dev/T/

## Affected

- `Linux >= 5fdeb0d372ab33b4175043a2a4a1730239a217f1 < f2dd9aaf6e2861337f5835f877a5b2becaf4b015`
- `Linux >= 5fdeb0d372ab33b4175043a2a4a1730239a217f1 < 4b75ff0aedd6ade1018ad4a3a9d8336794e36e42`
- `Linux >= 5fdeb0d372ab33b4175043a2a4a1730239a217f1 < ff134cc43972d7ddceff8cfd36cf6b9eaafc00b3`
- `Linux >= 5fdeb0d372ab33b4175043a2a4a1730239a217f1 < 0fda873092b541bb5a9b87d728a2429f863f8cfa`
- `Linux >= 5fdeb0d372ab33b4175043a2a4a1730239a217f1 < 69402908e277dd164bf8d7c8fd0513c0fac28e9e`
- `Linux >= 5fdeb0d372ab33b4175043a2a4a1730239a217f1 < f2664bc4f0f356f17c2094587a2b3665e3867e44`
- `Linux >= 5fdeb0d372ab33b4175043a2a4a1730239a217f1 < 5d2249eefaca59908fe3c264b8eca526424dcfbe`
- `Linux >= 5fdeb0d372ab33b4175043a2a4a1730239a217f1 < 2428083101f6883f979cceffa76cd8440751ffe6`
- `Linux 5.6`

## Remediation

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