CVE-2021-38787

There is an integer overflow in the ION driver "/dev/ion" of Allwinner R818 SoC Android Q SDK V1...

7.5 High

There is an integer overflow in the ION driver "/dev/ion" of Allwinner R818 SoC Android Q SDK V1.0 that could use the ioctl cmd "COMPAT_ION_IOC_SUNXI_FLUSH_RANGE" to cause a system crash (denial of service).

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

1.95%Up 0.7 points since Jan 20, 2022

What each source reports

NVD Score used 7.5

Record: CVE-2021-38787
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0: 7.8 HighAV:N/AC:L/Au:N/C:N/I:N/A:C
Weakness: CWE-190
Updated: 2026-11-02

CVE List No score

Record: CVE-2021-38787
Updated: 2026-11-02

EUVDEUVD-2021-25224 No score

Record: EUVD-2021-25224
Updated: 2026-11-03

GitHub AdvisoriesGHSA-h6gg-5gq2-7fgc No score

There is an integer overflow in the ION driver "/dev/ion" of Allwinner R818 SoC Android Q SDK V1...

Record: GHSA-h6gg-5gq2-7fgc
Weakness: CWE-190
Updated: 2026-11-02

Affected products

allwinnertech android q sdk

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-38787 is a high vulnerability (CVSS 7.5) in Allwinnertech Android Q Sdk, published January 19, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.95%, the 80th percentile. No source names a fixed version.