CVE-2026-46254

Kernel crash via unaligned DFA table access

Published Jun 3, 2026 · Updated Jun 3, 2026

Denial of service in Linux kernel AppArmor allows local users to crash the kernel by loading an unaligned DFA policy table. The aa_dfa_unpack path in security/apparmor/match.c directly dereferences big-endian multibyte fields and array elements from a policy blob without alignment-safe access. The path is reachable when local users can load AppArmor policy; architectures that fault on unaligned access can interrupt the host, with no reported data exposure or modification.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux kernel AppArmor allows local users to crash the kernel by loading an unaligned DFA policy table. The aa_dfa_unpack path in security/apparmor/match.c directly dereferences big-endian multibyte fields and array elements from a policy blob without alignment-safe access. The path is reachable when local users can load AppArmor policy; architectures that fault on unaligned access can interrupt the host, with no reported data exposure or modification.

The record

CVE
CVE-2026-46254
Published
Jun 3, 2026
Updated
Jun 3, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.11
  2. Affected versionversion=e6e8bf418850d7958311a96ccfb594f2bcc8313e <23f112bd6144e815153462e12d313ac3e7027168
  3. Affected versionversion=e6e8bf418850d7958311a96ccfb594f2bcc8313e <64802f731214a51dfe3c6c27636b3ddafd003eb0
  4. Affected versionversion=e6e8bf418850d7958311a96ccfb594f2bcc8313e <cded636008bde2b397a7cf63b8299d7c303aaf6a
  5. Affected versionversion=e6e8bf418850d7958311a96ccfb594f2bcc8313e <ec737e7fdf2f0ba7b203d4ec72cc915978b10e7e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.11; version=e6e8bf418850d7958311a96ccfb594f2bcc8313e <23f112bd6144e815153462e12d313ac3e7027168; version=e6e8bf418850d7958311a96ccfb594f2bcc8313e <64802f731214a51dfe3c6c27636b3ddafd003eb0; version=e6e8bf418850d7958311a96ccfb594f2bcc8313e <cded636008bde2b397a7cf63b8299d7c303aaf6a; version=e6e8bf418850d7958311a96ccfb594f2bcc8313e <ec737e7fdf2f0ba7b203d4ec72cc915978b10e7e

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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