CVE-2021-38787

System crash via ION flush-range integer overflow

Published Jan 19, 2022 · Updated Aug 4, 2024

Integer overflow in the ION driver of Allwinner R818 SoC Android Q SDK 1.0 allows attackers to crash the system via a crafted ioctl. The /dev/ion compatibility handler performs unsafe integer arithmetic while processing COMPAT_ION_IOC_SUNXI_FLUSH_RANGE flush-range arguments. The public record does not state what access is required to reach the device node; the documented consequence is a system crash, not code execution.

CVSS severity7.5
High
EPSS probability1.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in the ION driver of Allwinner R818 SoC Android Q SDK 1.0 allows attackers to crash the system via a crafted ioctl. The /dev/ion compatibility handler performs unsafe integer arithmetic while processing COMPAT_ION_IOC_SUNXI_FLUSH_RANGE flush-range arguments. The public record does not state what access is required to reach the device node; the documented consequence is a system crash, not code execution.

The record

CVE
CVE-2021-38787
Published
Jan 19, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-190, T1499
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Jan 19, 2022CVE 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 vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:C
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
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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