---
id: CVE-2026-72441
title: 'ieee802154: fix kernel-infoleak in dgram_recvmsg()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ieee802154: fix kernel-infoleak in dgram_recvmsg()

  KMSAN reported a kernel-infoleak in move_addr_to_user():

  BUG: KMSAN: kernel-infoleak in instrument_copy_to_user
  inc…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 94b4f6c21cf54029377a0645675a9d81b6cf890d <
    a2ee1a038a16e286d084bc293a7522d010a59ec3
  - >-
    Linux >= 94b4f6c21cf54029377a0645675a9d81b6cf890d <
    09cfe665f2c5d7a8a5ed4d6b487434a011325368
  - >-
    Linux >= 94b4f6c21cf54029377a0645675a9d81b6cf890d <
    c88e687e44cb9c7690f5039a5a5941dba1f6a204
  - >-
    Linux >= 94b4f6c21cf54029377a0645675a9d81b6cf890d <
    71b5add66c51d6764325de5f2e300bbf4f39e7a6
  - >-
    Linux >= 94b4f6c21cf54029377a0645675a9d81b6cf890d <
    fc8766467b53335220b4b594ba15bc8f8cee0c76
  - >-
    Linux >= 94b4f6c21cf54029377a0645675a9d81b6cf890d <
    de3bd9809af7555611334cb6a071806744430ef7
  - >-
    Linux >= 94b4f6c21cf54029377a0645675a9d81b6cf890d <
    f14802465f5956baafe5f4b4541eb626b06b41f1
  - >-
    Linux >= 94b4f6c21cf54029377a0645675a9d81b6cf890d <
    4db86f8ab11b5a41bfc36680be837e6ac1375ec6
  - Linux 3.15
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T16:55:28.811122Z'
published: '2026-08-15'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T17:05:42.677Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-72441'
references:
  - url: 'https://git.kernel.org/stable/c/a2ee1a038a16e286d084bc293a7522d010a59ec3'
  - url: 'https://git.kernel.org/stable/c/09cfe665f2c5d7a8a5ed4d6b487434a011325368'
  - url: 'https://git.kernel.org/stable/c/c88e687e44cb9c7690f5039a5a5941dba1f6a204'
  - url: 'https://git.kernel.org/stable/c/71b5add66c51d6764325de5f2e300bbf4f39e7a6'
  - url: 'https://git.kernel.org/stable/c/fc8766467b53335220b4b594ba15bc8f8cee0c76'
  - url: 'https://git.kernel.org/stable/c/de3bd9809af7555611334cb6a071806744430ef7'
  - url: 'https://git.kernel.org/stable/c/f14802465f5956baafe5f4b4541eb626b06b41f1'
  - url: 'https://git.kernel.org/stable/c/4db86f8ab11b5a41bfc36680be837e6ac1375ec6'
tags:
  - cve.org
epss: 0.00236
epssPercentile: 0.14729
ingestedAt: '2026-11-06T18:00:12.571Z'
---

## Overview

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

ieee802154: fix kernel-infoleak in dgram_recvmsg()

KMSAN reported a kernel-infoleak in move_addr_to_user():

BUG: KMSAN: kernel-infoleak in instrument_copy_to_user
include/linux/instrumented.h:131 [inline]
BUG: KMSAN: kernel-infoleak in _inline_copy_to_user
include/linux/uaccess.h:205 [inline]
BUG: KMSAN: kernel-infoleak in _copy_to_user+0xcc/0x120
lib/usercopy.c:26
 instrument_copy_to_user include/linux/instrumented.h:131 [inline]
 _inline_copy_to_user include/linux/uaccess.h:205 [inline]
 _copy_to_user+0xcc/0x120 lib/usercopy.c:26
 copy_to_user include/linux/uaccess.h:236 [inline]
 move_addr_to_user+0x2e7/0x440 net/socket.c:302
 ____sys_recvmsg+0x232/0x610 net/socket.c:2925
 ...
 Uninit was stored to memory at:
 ieee802154_addr_to_sa include/net/ieee802154_netdev.h:369 [inline]
 dgram_recvmsg+0xa09/0xbe0 net/ieee802154/socket.c:739

The issue occurs because the `pan_id` field of `struct ieee802154_addr`
is left uninitialized when the address mode is `IEEE802154_ADDR_NONE`.
The execution flow is as follows:

1. `__ieee802154_rx_handle_packet()` declares a local `struct
ieee802154_hdr hdr` on the stack.
2. `ieee802154_hdr_pull()` calls `ieee802154_hdr_get_addr()` to parse
the source and destination addresses into this structure.
3. If the address mode is `IEEE802154_ADDR_NONE`,
`ieee802154_hdr_get_addr()` previously only set the `mode` field,
leaving the `pan_id` field containing uninitialized stack memory.
4. This uninitialized `pan_id` is later copied into a `struct
sockaddr_ieee802154` in `dgram_recvmsg()` via `ieee802154_addr_to_sa()`.
5. Finally, `move_addr_to_user()` copies the socket address structure to
user space, leaking the uninitialized bytes.

Fix this by using `memset` to zero out the address structure in
`ieee802154_hdr_get_addr()` when the mode is `IEEE802154_ADDR_NONE`.

## Affected

- `Linux >= 94b4f6c21cf54029377a0645675a9d81b6cf890d < a2ee1a038a16e286d084bc293a7522d010a59ec3`
- `Linux >= 94b4f6c21cf54029377a0645675a9d81b6cf890d < 09cfe665f2c5d7a8a5ed4d6b487434a011325368`
- `Linux >= 94b4f6c21cf54029377a0645675a9d81b6cf890d < c88e687e44cb9c7690f5039a5a5941dba1f6a204`
- `Linux >= 94b4f6c21cf54029377a0645675a9d81b6cf890d < 71b5add66c51d6764325de5f2e300bbf4f39e7a6`
- `Linux >= 94b4f6c21cf54029377a0645675a9d81b6cf890d < fc8766467b53335220b4b594ba15bc8f8cee0c76`
- `Linux >= 94b4f6c21cf54029377a0645675a9d81b6cf890d < de3bd9809af7555611334cb6a071806744430ef7`
- `Linux >= 94b4f6c21cf54029377a0645675a9d81b6cf890d < f14802465f5956baafe5f4b4541eb626b06b41f1`
- `Linux >= 94b4f6c21cf54029377a0645675a9d81b6cf890d < 4db86f8ab11b5a41bfc36680be837e6ac1375ec6`
- `Linux 3.15`

## Remediation

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