---
id: CVE-2026-43088
title: 'net: af_key: zero aligned sockaddr tail in PF_KEY exports'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: af_key: zero aligned sockaddr tail in PF_KEY exports

  PF_KEY export paths use `pfkey_sockaddr_size()` when reserving sockaddr
  payload space, so IPv6 addresses occu…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    6df5f90175fe4c584e9960b6c00131a7bf2b5399
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    746ee79d9e140f0e9e56f5123eaa88ad9332de7b
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    e357c3cf8a44d4ec1f49ad6981e4ab9704354347
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    3c19cb8a84ef709d57943bd6664cf31cb91ba6ec
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    11cbf294bac623bd57296f231199193087f57b4a
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    edd446ee7cd3d02cac246168063d5b3e9ea68460
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    2e74f974359b5382ecbe8536abbb5b837eb6c724
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    426c355742f02cf743b347d9d7dbdc1bfbfa31ef
  - Linux 2.6.12
published: '2026-05-06'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T11:58:17.134Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-43088'
references:
  - url: 'https://git.kernel.org/stable/c/6df5f90175fe4c584e9960b6c00131a7bf2b5399'
  - url: 'https://git.kernel.org/stable/c/746ee79d9e140f0e9e56f5123eaa88ad9332de7b'
  - url: 'https://git.kernel.org/stable/c/e357c3cf8a44d4ec1f49ad6981e4ab9704354347'
  - url: 'https://git.kernel.org/stable/c/3c19cb8a84ef709d57943bd6664cf31cb91ba6ec'
  - url: 'https://git.kernel.org/stable/c/11cbf294bac623bd57296f231199193087f57b4a'
  - url: 'https://git.kernel.org/stable/c/edd446ee7cd3d02cac246168063d5b3e9ea68460'
  - url: 'https://git.kernel.org/stable/c/2e74f974359b5382ecbe8536abbb5b837eb6c724'
  - url: 'https://git.kernel.org/stable/c/426c355742f02cf743b347d9d7dbdc1bfbfa31ef'
tags:
  - cve.org
epss: 0.00162
epssPercentile: 0.04767
ingestedAt: '2026-09-14T15:23:07.458Z'
---

## Overview

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

net: af_key: zero aligned sockaddr tail in PF_KEY exports

PF_KEY export paths use `pfkey_sockaddr_size()` when reserving sockaddr
payload space, so IPv6 addresses occupy 32 bytes on the wire. However,
`pfkey_sockaddr_fill()` initializes only the first 28 bytes of
`struct sockaddr_in6`, leaving the final 4 aligned bytes uninitialized.

Not every PF_KEY message is affected. The state and policy dump builders
already zero the whole message buffer before filling the sockaddr
payloads. Keep the fix to the export paths that still append aligned
sockaddr payloads with plain `skb_put()`:

  - `SADB_ACQUIRE`
  - `SADB_X_NAT_T_NEW_MAPPING`
  - `SADB_X_MIGRATE`

Fix those paths by clearing only the aligned sockaddr tail after
`pfkey_sockaddr_fill()`.

## Affected

- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 6df5f90175fe4c584e9960b6c00131a7bf2b5399`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 746ee79d9e140f0e9e56f5123eaa88ad9332de7b`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < e357c3cf8a44d4ec1f49ad6981e4ab9704354347`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3c19cb8a84ef709d57943bd6664cf31cb91ba6ec`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 11cbf294bac623bd57296f231199193087f57b4a`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < edd446ee7cd3d02cac246168063d5b3e9ea68460`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2e74f974359b5382ecbe8536abbb5b837eb6c724`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 426c355742f02cf743b347d9d7dbdc1bfbfa31ef`
- `Linux 2.6.12`

## Remediation

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