How severe is CVE-2021-38787?

CVE-2021-38787 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-38787 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-38787?

CVE-2021-38787 affects Allwinnertech Android Q Sdk. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-38787?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-38787 published?

CVE-2021-38787 was published on 2022-01-19 and last updated on 2026-06-17.

CVE-2021-38787

CVE-2021-38787 is a high-severity vulnerability in Allwinnertech Android Q Sdk with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-190.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.8
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-190
Affected product: Allwinnertech Android Q Sdk
Published: 2022-01-19
Last modified: 2026-06-17

Description

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).

Frequently asked questions

What is CVE-2021-38787?: 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).
How severe is CVE-2021-38787?: CVE-2021-38787 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-38787 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-38787?: CVE-2021-38787 affects Allwinnertech Android Q Sdk. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-38787?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-38787 published?: CVE-2021-38787 was published on 2022-01-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:allwinnertech:android_q_sdk:1.0:*:*:*:*:*:*:*

More vulnerabilities in Allwinnertech Android Q Sdk

CVE-2021-38789 — High (CVSS 7.5): Allwinner R818 SoC Android Q SDK V1.0 is affected by an incorrect access control vulnerability that does not check the…
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CVE-2021-38784 — High (CVSS 7.5): There is a NULL pointer dereference in the syscall open_exec function of Allwinner R818 SoC Android Q SDK V1.0 that…
CVE-2021-38783 — High (CVSS 7.5): There is a Out-of-Bound Write in the Allwinner R818 SoC Android Q SDK V1.0 camera driver "/dev/cedar_dev" through iotcl…

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