CVE WatchAug 11, 2026

CVE-2020-27339

In the kernel in Insyde InsydeH2O 5.x, certain SMM drivers did not correctly validate the CommBuffer and CommBufferSize parameters, allowing

CVSS

6.7

Medium

EPSS

0.3%

p24

KEV

—

Exploit Today

0-100

Published: Jun 16, 2021 · Last modified: Aug 11, 2026 · CWE-20

EPSS · 30d

0.3%EPSS · 30 days0.3%

2026-08-142026-09-11

Technical description

In the kernel in Insyde InsydeH2O 5.x, certain SMM drivers did not correctly validate the CommBuffer and CommBufferSize parameters, allowing callers to corrupt either the firmware or the OS memory. The fixed versions for this issue in the AhciBusDxe, IdeBusDxe, NvmExpressDxe, SdHostDriverDxe, and SdMmcDeviceDxe drivers are 05.16.25, 05.26.25, 05.35.25, 05.43.25, and 05.51.25 (for Kernel 5.1 through 5.5).

Official references

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