CVE-2021-42252

Kernel memory corruption via mismatched mmap units

Published Oct 11, 2021 · Updated Aug 4, 2024

An out-of-bounds write in the ASPEED LPC control driver in Linux kernel before 5.14.6 allows local users to corrupt kernel memory. aspeed_lpc_ctrl_mmap adds a page offset to a byte length and compares that mixed-unit sum against a base address plus size, letting mappings escape the driver's reserved region. Exploitation requires local access to the ASPEED LPC control interface; a successful attempt can crash the system or enable arbitrary code execution with elevated privileges.

CVSS severity7.8
High
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds write in the ASPEED LPC control driver in Linux kernel before 5.14.6 allows local users to corrupt kernel memory. aspeed_lpc_ctrl_mmap adds a page offset to a byte length and compares that mixed-unit sum against a base address plus size, letting mappings escape the driver's reserved region. Exploitation requires local access to the ASPEED LPC control interface; a successful attempt can crash the system or enable arbitrary code execution with elevated privileges.

The record

CVE
CVE-2021-42252
Published
Oct 11, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 11, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.6NVDAV:L/AC:L/Au:N/C:P/I:P/A:P

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

T1068Exploitation for Privilege Escalation

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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