---
id: CVE-2026-97599
title: "In the Linux kernel, the following vulnerability has been resolved:\n\nieee802154: hwsim: serialize pib updates to fix double-free\n\nhwsim_update_pib() does an unserialized read-swap-free of phy->pib:\n\n\tpib_old = rtnl_dereference(phy->pib);…"
summary: "In the Linux kernel, the following vulnerability has been resolved:\n\nieee802154: hwsim: serialize pib updates to fix double-free\n\nhwsim_update_pib() does an unserialized read-swap-free of phy->pib:\n\n\tpib_old = rtnl_dereference(phy->pib);…"
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= f25da51fdc381ca2863248c7060b3662632f0872 <
    9973b3a67a7592a780ea12b08334539a900deec1
  - >-
    Linux >= f25da51fdc381ca2863248c7060b3662632f0872 <
    d3b8f264ce09573aededd0a97dc41c8147797d8f
  - >-
    Linux >= f25da51fdc381ca2863248c7060b3662632f0872 <
    db6442deecb1f13aeaf4f9d77746ea7555630fb3
  - >-
    Linux >= f25da51fdc381ca2863248c7060b3662632f0872 <
    979d5b8de8ed4e1f997aef12da5694b99be7b871
  - Linux 4.19
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T11:17:11.243'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97599'
references:
  - url: 'https://git.kernel.org/stable/c/979d5b8de8ed4e1f997aef12da5694b99be7b871'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9973b3a67a7592a780ea12b08334539a900deec1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d3b8f264ce09573aededd0a97dc41c8147797d8f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/db6442deecb1f13aeaf4f9d77746ea7555630fb3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-25T11:06:38.903Z'
---

## Overview

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

ieee802154: hwsim: serialize pib updates to fix double-free

hwsim_update_pib() does an unserialized read-swap-free of phy->pib:

	pib_old = rtnl_dereference(phy->pib);
	...
	rcu_assign_pointer(phy->pib, pib);
	kfree_rcu(pib_old, rcu);

It assumes the RTNL is held, but ->set_channel is not always called
under it: the mac802154 scan worker changes channels via
drv_set_channel() without the RTNL. Such an update can race an
RTNL-held one on the same phy; both read the same pib_old and both
kfree_rcu() it, double-freeing the object. With SLUB percpu sheaves
batching kfree_rcu(), this surfaces as a KASAN invalid-free in
rcu_free_sheaf().

struct hwsim_phy has no lock for pib. Add one and make the swap atomic
with rcu_replace_pointer() under it, dropping the misleading
rtnl_dereference().

## Remediation

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