VYPR
Medium severity6.0NVD Advisory· Published May 13, 2021· Updated Jun 17, 2026

CVE-2021-20221

CVE-2021-20221

Description

An out-of-bounds heap buffer access issue was found in the ARM Generic Interrupt Controller emulator of QEMU up to and including qemu 4.2.0on aarch64 platform. The issue occurs because while writing an interrupt ID to the controller memory area, it is not masked to be 4 bits wide. It may lead to the said issue while updating controller state fields and their subsequent processing. A privileged guest user may use this flaw to crash the QEMU process on the host resulting in DoS scenario.

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Affected products

76

Patches

Vulnerability mechanics

References

5

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