---
id: CVE-2022-49865
title: 'ipv6: addrlabel: fix infoleak when sending struct ifaddrlblmsg to network'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ipv6: addrlabel: fix infoleak when sending struct ifaddrlblmsg to network

  When copying a `struct ifaddrlblmsg` to the network, __ifal_reserved
  remained uninitialized, …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 2a8cc6c89039e0530a3335954253b76ed0f9339a <
    568a47ff756f913e8b374c2af9d22cd2c772c744
  - >-
    Linux >= 2a8cc6c89039e0530a3335954253b76ed0f9339a <
    0f85b7ae7c4b5d7b4bbf7ac653a733c181a8a2bf
  - >-
    Linux >= 2a8cc6c89039e0530a3335954253b76ed0f9339a <
    6d26d0587abccb9835382a0b53faa7b9b1cd83e3
  - >-
    Linux >= 2a8cc6c89039e0530a3335954253b76ed0f9339a <
    58cd7fdc8c1e6c7873acc08f190069fed88d1c12
  - >-
    Linux >= 2a8cc6c89039e0530a3335954253b76ed0f9339a <
    a033b86c7f7621fde31f0364af8986f43b44914f
  - >-
    Linux >= 2a8cc6c89039e0530a3335954253b76ed0f9339a <
    2acb2779b147decd300c117683d5a32ce61c75d6
  - >-
    Linux >= 2a8cc6c89039e0530a3335954253b76ed0f9339a <
    49e92ba5ecd7d72ba369dde2ccff738edd028a47
  - >-
    Linux >= 2a8cc6c89039e0530a3335954253b76ed0f9339a <
    c23fb2c82267638f9d206cb96bb93e1f93ad7828
  - Linux 2.6.25
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T19:50:52.329864Z'
published: '2025-05-01'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:00:10.037Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2022-49865'
references:
  - url: 'https://git.kernel.org/stable/c/568a47ff756f913e8b374c2af9d22cd2c772c744'
  - url: 'https://git.kernel.org/stable/c/0f85b7ae7c4b5d7b4bbf7ac653a733c181a8a2bf'
  - url: 'https://git.kernel.org/stable/c/6d26d0587abccb9835382a0b53faa7b9b1cd83e3'
  - url: 'https://git.kernel.org/stable/c/58cd7fdc8c1e6c7873acc08f190069fed88d1c12'
  - url: 'https://git.kernel.org/stable/c/a033b86c7f7621fde31f0364af8986f43b44914f'
  - url: 'https://git.kernel.org/stable/c/2acb2779b147decd300c117683d5a32ce61c75d6'
  - url: 'https://git.kernel.org/stable/c/49e92ba5ecd7d72ba369dde2ccff738edd028a47'
  - url: 'https://git.kernel.org/stable/c/c23fb2c82267638f9d206cb96bb93e1f93ad7828'
tags:
  - cve.org
epss: 0.00223
epssPercentile: 0.13035
ingestedAt: '2026-11-05T22:38:31.621Z'
---

## Overview

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

ipv6: addrlabel: fix infoleak when sending struct ifaddrlblmsg to network

When copying a `struct ifaddrlblmsg` to the network, __ifal_reserved
remained uninitialized, resulting in a 1-byte infoleak:

  BUG: KMSAN: kernel-network-infoleak in __netdev_start_xmit ./include/linux/netdevice.h:4841
   __netdev_start_xmit ./include/linux/netdevice.h:4841
   netdev_start_xmit ./include/linux/netdevice.h:4857
   xmit_one net/core/dev.c:3590
   dev_hard_start_xmit+0x1dc/0x800 net/core/dev.c:3606
   __dev_queue_xmit+0x17e8/0x4350 net/core/dev.c:4256
   dev_queue_xmit ./include/linux/netdevice.h:3009
   __netlink_deliver_tap_skb net/netlink/af_netlink.c:307
   __netlink_deliver_tap+0x728/0xad0 net/netlink/af_netlink.c:325
   netlink_deliver_tap net/netlink/af_netlink.c:338
   __netlink_sendskb net/netlink/af_netlink.c:1263
   netlink_sendskb+0x1d9/0x200 net/netlink/af_netlink.c:1272
   netlink_unicast+0x56d/0xf50 net/netlink/af_netlink.c:1360
   nlmsg_unicast ./include/net/netlink.h:1061
   rtnl_unicast+0x5a/0x80 net/core/rtnetlink.c:758
   ip6addrlbl_get+0xfad/0x10f0 net/ipv6/addrlabel.c:628
   rtnetlink_rcv_msg+0xb33/0x1570 net/core/rtnetlink.c:6082
  ...
  Uninit was created at:
   slab_post_alloc_hook+0x118/0xb00 mm/slab.h:742
   slab_alloc_node mm/slub.c:3398
   __kmem_cache_alloc_node+0x4f2/0x930 mm/slub.c:3437
   __do_kmalloc_node mm/slab_common.c:954
   __kmalloc_node_track_caller+0x117/0x3d0 mm/slab_common.c:975
   kmalloc_reserve net/core/skbuff.c:437
   __alloc_skb+0x27a/0xab0 net/core/skbuff.c:509
   alloc_skb ./include/linux/skbuff.h:1267
   nlmsg_new ./include/net/netlink.h:964
   ip6addrlbl_get+0x490/0x10f0 net/ipv6/addrlabel.c:608
   rtnetlink_rcv_msg+0xb33/0x1570 net/core/rtnetlink.c:6082
   netlink_rcv_skb+0x299/0x550 net/netlink/af_netlink.c:2540
   rtnetlink_rcv+0x26/0x30 net/core/rtnetlink.c:6109
   netlink_unicast_kernel net/netlink/af_netlink.c:1319
   netlink_unicast+0x9ab/0xf50 net/netlink/af_netlink.c:1345
   netlink_sendmsg+0xebc/0x10f0 net/netlink/af_netlink.c:1921
  ...

This patch ensures that the reserved field is always initialized.

## Affected

- `Linux >= 2a8cc6c89039e0530a3335954253b76ed0f9339a < 568a47ff756f913e8b374c2af9d22cd2c772c744`
- `Linux >= 2a8cc6c89039e0530a3335954253b76ed0f9339a < 0f85b7ae7c4b5d7b4bbf7ac653a733c181a8a2bf`
- `Linux >= 2a8cc6c89039e0530a3335954253b76ed0f9339a < 6d26d0587abccb9835382a0b53faa7b9b1cd83e3`
- `Linux >= 2a8cc6c89039e0530a3335954253b76ed0f9339a < 58cd7fdc8c1e6c7873acc08f190069fed88d1c12`
- `Linux >= 2a8cc6c89039e0530a3335954253b76ed0f9339a < a033b86c7f7621fde31f0364af8986f43b44914f`
- `Linux >= 2a8cc6c89039e0530a3335954253b76ed0f9339a < 2acb2779b147decd300c117683d5a32ce61c75d6`
- `Linux >= 2a8cc6c89039e0530a3335954253b76ed0f9339a < 49e92ba5ecd7d72ba369dde2ccff738edd028a47`
- `Linux >= 2a8cc6c89039e0530a3335954253b76ed0f9339a < c23fb2c82267638f9d206cb96bb93e1f93ad7828`
- `Linux 2.6.25`

## Remediation

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