CVE-2018-21040Network attack vector

Use-after-free via g2d driver race

Published Apr 8, 2020 · Updated Aug 5, 2024

Race condition in Samsung mobile devices with Android O 8.x or P 9.0 on Exynos 9810 allows attackers to trigger a g2d driver use-after-free. The g2d driver can free an object while another execution path still accesses it, creating a use-after-free during concurrent operations. The record does not specify a required privilege, user interaction, or concrete outcome beyond the memory-safety failure, so resulting confidentiality, integrity, or availability effects remain unspecified.

CVSS severity8.1
High
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Samsung mobile devices with Android O 8.x or P 9.0 on Exynos 9810 allows attackers to trigger a g2d driver use-after-free. The g2d driver can free an object while another execution path still accesses it, creating a use-after-free during concurrent operations. The record does not specify a required privilege, user interaction, or concrete outcome beyond the memory-safety failure, so resulting confidentiality, integrity, or availability effects remain unspecified.

The record

CVE
CVE-2018-21040
Published
Apr 8, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-362, CWE-416
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 8, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.1NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
6.8NVDAV:N/AC:M/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.

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-416Use After Free

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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