# CVE-2022-49865: ipv6: addrlabel: fix infoleak when sending struct ifaddrlblmsg to network

Status: published. Published: 2025-05-01. Updated: 2026-11-05.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 2a8cc6c89039e0530a3335954253b76ed0f9339a; < 568a47ff756f913e8b374c2af9d22cd2c772c744 (affected, git); ≥ 2a8cc6c89039e0530a3335954253b76ed0f9339a; < 0f85b7ae7c4b5d7b4bbf7ac653a733c181a8a2bf (affected, git); ≥ 2a8cc6c89039e0530a3335954253b76ed0f9339a; < 6d26d0587abccb9835382a0b53faa7b9b1cd83e3 (affected, git); ≥ 2a8cc6c89039e0530a3335954253b76ed0f9339a; < 58cd7fdc8c1e6c7873acc08f190069fed88d1c12 (affected, git); ≥ 2a8cc6c89039e0530a3335954253b76ed0f9339a; < a033b86c7f7621fde31f0364af8986f43b44914f (affected, git); ≥ 2a8cc6c89039e0530a3335954253b76ed0f9339a; < 2acb2779b147decd300c117683d5a32ce61c75d6 (affected, git); ≥ 2a8cc6c89039e0530a3335954253b76ed0f9339a; < 49e92ba5ecd7d72ba369dde2ccff738edd028a47 (affected, git); ≥ 2a8cc6c89039e0530a3335954253b76ed0f9339a; < c23fb2c82267638f9d206cb96bb93e1f93ad7828 (affected, git). Source: CNA: Linux
- Linux / Linux: 2.6.25 (affected); ≥ 0; < 2.6.25 (unaffected, semver); ≥ 4.9.334; ≤ 4.9.* (unaffected, semver); ≥ 4.14.300; ≤ 4.14.* (unaffected, semver); ≥ 4.19.267; ≤ 4.19.* (unaffected, semver); ≥ 5.4.225; ≤ 5.4.* (unaffected, semver); ≥ 5.10.155; ≤ 5.10.* (unaffected, semver); ≥ 5.15.79; ≤ 5.15.* (unaffected, semver); ≥ 6.0.9; ≤ 6.0.* (unaffected, semver); ≥ 6.1; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.22% as of 2026-11-05; percentile 13.06%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/568a47ff756f913e8b374c2af9d22cd2c772c744 (CNA: Linux)

- https://git.kernel.org/stable/c/0f85b7ae7c4b5d7b4bbf7ac653a733c181a8a2bf (CNA: Linux)

- https://git.kernel.org/stable/c/6d26d0587abccb9835382a0b53faa7b9b1cd83e3 (CNA: Linux)

- https://git.kernel.org/stable/c/58cd7fdc8c1e6c7873acc08f190069fed88d1c12 (CNA: Linux)

- https://git.kernel.org/stable/c/a033b86c7f7621fde31f0364af8986f43b44914f (CNA: Linux)

- https://git.kernel.org/stable/c/2acb2779b147decd300c117683d5a32ce61c75d6 (CNA: Linux)

- https://git.kernel.org/stable/c/49e92ba5ecd7d72ba369dde2ccff738edd028a47 (CNA: Linux)

- https://git.kernel.org/stable/c/c23fb2c82267638f9d206cb96bb93e1f93ad7828 (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2022-49865; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2022-49865; retrieved 2026-11-05; source updated Not reported

Revision: 55678764d5a3088e791157a690f1c95e91ea8caa468ffee092a0fdfc28697f58

Canonical: https://y2.dev/cve/CVE-2022-49865

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