CVE-2021-26689

Kernel memory corruption via laf_read use-after-free

Published Feb 4, 2021 · Updated Aug 3, 2024

Use-after-free in LG mobile devices with Android 8.0, 8.1, 9.0, and 10 allows attackers to corrupt kernel memory through the USB laf gadget. The laf_read function in f_laf.c accesses memory after its object has been freed; public sources do not disclose the triggering state sequence. A USB host must interact with the gadget; published evidence establishes memory corruption but does not demonstrate code execution for this laf flaw.

CVSS severity9.8
Critical
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in LG mobile devices with Android 8.0, 8.1, 9.0, and 10 allows attackers to corrupt kernel memory through the USB laf gadget. The laf_read function in f_laf.c accesses memory after its object has been freed; public sources do not disclose the triggering state sequence. A USB host must interact with the gadget; published evidence establishes memory corruption but does not demonstrate code execution for this laf flaw.

The record

CVE
CVE-2021-26689
Published
Feb 4, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416
Attack vector
Unavailable
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 4, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 vectorUnavailable in this record.
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-416Use After Free

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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