CVE-2026-45893

Kernel memory disclosure and crash via unaligned reads

Published May 27, 2026 · Updated May 27, 2026

Unaligned memory access in Linux Kernel AppArmor allows local users to disclose kernel memory or crash the system via a policy blob. The unpack_table UNPACK_ARRAY path treats possibly unaligned policy bytes as 16- or 32-bit elements and performs typed reads instead of unaligned-safe accesses. Exploitation requires low-privileged local access and attacker-controlled policy data; the bounded consequences are memory disclosure and a system crash.

CVSS severity7.1
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unaligned memory access in Linux Kernel AppArmor allows local users to disclose kernel memory or crash the system via a policy blob. The unpack_table UNPACK_ARRAY path treats possibly unaligned policy bytes as 16- or 32-bit elements and performs typed reads instead of unaligned-safe accesses. Exploitation requires low-privileged local access and attacker-controlled policy data; the bounded consequences are memory disclosure and a system crash.

The record

CVE
CVE-2026-45893
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 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 <226c3b10aab23f73b03c47e7773107de56ba3a4e
  3. Affected versionversion=e6e8bf418850d7958311a96ccfb594f2bcc8313e <47e351dfef60ab0e3285133556e1a9c7f646a969
  4. Affected versionversion=e6e8bf418850d7958311a96ccfb594f2bcc8313e <6fc367bfd4c8886e6b1742aabbd1c0bdc310db3a
  5. Affected versionversion=e6e8bf418850d7958311a96ccfb594f2bcc8313e <e027999049c493fb728ead5a90db76942181a935

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.11; version=e6e8bf418850d7958311a96ccfb594f2bcc8313e <226c3b10aab23f73b03c47e7773107de56ba3a4e; version=e6e8bf418850d7958311a96ccfb594f2bcc8313e <47e351dfef60ab0e3285133556e1a9c7f646a969; version=e6e8bf418850d7958311a96ccfb594f2bcc8313e <6fc367bfd4c8886e6b1742aabbd1c0bdc310db3a; version=e6e8bf418850d7958311a96ccfb594f2bcc8313e <e027999049c493fb728ead5a90db76942181a935

Published CVSS scores

7.1NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Application or System Exploitation

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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