---
id: CVE-2026-46254
title: 'AppArmor: Allow apparmor to handle unaligned dfa tables'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  AppArmor: Allow apparmor to handle unaligned dfa tables

  The dfa tables can originate from kernel or userspace and 8-byte alignment
  isn't always guaranteed and as such …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= e6e8bf418850d7958311a96ccfb594f2bcc8313e <
    bd00629b527888a08a5222640fea045c6f64f5b5
  - >-
    Linux >= e6e8bf418850d7958311a96ccfb594f2bcc8313e <
    ec737e7fdf2f0ba7b203d4ec72cc915978b10e7e
  - >-
    Linux >= e6e8bf418850d7958311a96ccfb594f2bcc8313e <
    23f112bd6144e815153462e12d313ac3e7027168
  - >-
    Linux >= e6e8bf418850d7958311a96ccfb594f2bcc8313e <
    cded636008bde2b397a7cf63b8299d7c303aaf6a
  - >-
    Linux >= e6e8bf418850d7958311a96ccfb594f2bcc8313e <
    64802f731214a51dfe3c6c27636b3ddafd003eb0
  - Linux 4.11
published: '2026-06-03'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T12:41:30.894Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-46254'
references:
  - url: 'https://git.kernel.org/stable/c/bd00629b527888a08a5222640fea045c6f64f5b5'
  - url: 'https://git.kernel.org/stable/c/ec737e7fdf2f0ba7b203d4ec72cc915978b10e7e'
  - url: 'https://git.kernel.org/stable/c/23f112bd6144e815153462e12d313ac3e7027168'
  - url: 'https://git.kernel.org/stable/c/cded636008bde2b397a7cf63b8299d7c303aaf6a'
  - url: 'https://git.kernel.org/stable/c/64802f731214a51dfe3c6c27636b3ddafd003eb0'
tags:
  - cve.org
epss: 0.00114
epssPercentile: 0.01396
ingestedAt: '2026-10-21T12:48:53.628Z'
---

## Overview

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

AppArmor: Allow apparmor to handle unaligned dfa tables

The dfa tables can originate from kernel or userspace and 8-byte alignment
isn't always guaranteed and as such may trigger unaligned memory accesses
on various architectures. Resulting in the following

[   73.901376] WARNING: CPU: 0 PID: 341 at security/apparmor/match.c:316 aa_dfa_unpack+0x6cc/0x720
[   74.015867] Modules linked in: binfmt_misc evdev flash sg drm drm_panel_orientation_quirks backlight i2c_core configfs nfnetlink autofs4 ext4 crc16 mbcache jbd2 hid_generic usbhid sr_mod hid cdrom
sd_mod ata_generic ohci_pci ehci_pci ehci_hcd ohci_hcd pata_ali libata sym53c8xx scsi_transport_spi tg3 scsi_mod usbcore libphy scsi_common mdio_bus usb_common
[   74.428977] CPU: 0 UID: 0 PID: 341 Comm: apparmor_parser Not tainted 6.18.0-rc6+ #9 NONE
[   74.536543] Call Trace:
[   74.568561] [<0000000000434c24>] dump_stack+0x8/0x18
[   74.633757] [<0000000000476438>] __warn+0xd8/0x100
[   74.696664] [<00000000004296d4>] warn_slowpath_fmt+0x34/0x74
[   74.771006] [<00000000008db28c>] aa_dfa_unpack+0x6cc/0x720
[   74.843062] [<00000000008e643c>] unpack_pdb+0xbc/0x7e0
[   74.910545] [<00000000008e7740>] unpack_profile+0xbe0/0x1300
[   74.984888] [<00000000008e82e0>] aa_unpack+0xe0/0x6a0
[   75.051226] [<00000000008e3ec4>] aa_replace_profiles+0x64/0x1160
[   75.130144] [<00000000008d4d90>] policy_update+0xf0/0x280
[   75.201057] [<00000000008d4fc8>] profile_replace+0xa8/0x100
[   75.274258] [<0000000000766bd0>] vfs_write+0x90/0x420
[   75.340594] [<00000000007670cc>] ksys_write+0x4c/0xe0
[   75.406932] [<0000000000767174>] sys_write+0x14/0x40
[   75.472126] [<0000000000406174>] linux_sparc_syscall+0x34/0x44
[   75.548802] ---[ end trace 0000000000000000 ]---
[   75.609503] dfa blob stream 0xfff0000008926b96 not aligned.
[   75.682695] Kernel unaligned access at TPC[8db2a8] aa_dfa_unpack+0x6e8/0x720

Work around it by using the get_unaligned_xx() helpers.

## Affected

- `Linux >= e6e8bf418850d7958311a96ccfb594f2bcc8313e < bd00629b527888a08a5222640fea045c6f64f5b5`
- `Linux >= e6e8bf418850d7958311a96ccfb594f2bcc8313e < ec737e7fdf2f0ba7b203d4ec72cc915978b10e7e`
- `Linux >= e6e8bf418850d7958311a96ccfb594f2bcc8313e < 23f112bd6144e815153462e12d313ac3e7027168`
- `Linux >= e6e8bf418850d7958311a96ccfb594f2bcc8313e < cded636008bde2b397a7cf63b8299d7c303aaf6a`
- `Linux >= e6e8bf418850d7958311a96ccfb594f2bcc8313e < 64802f731214a51dfe3c6c27636b3ddafd003eb0`
- `Linux 4.11`

## Remediation

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