CVE-2024-52878

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-15 · updated 2026-06-17
Weakness: CWE-126

Description

An issue was discovered in Insyde InsydeH2O kernel 5.2 before version 05.29.50, kernel 5.3 before version 05.38.50, kernel 5.4 before version 05.46.50, kernel 5.5 before version 05.54.50, kernel 5.6 before version 05.61.50, and kernel 5.7 before version 05.70.50. In VariableRuntimeDxe driver, VariableServicesSetVariable () can be called by gRT_>SetVariable () or the SmmSetSensitiveVariable () or SmmInternalSetVariable () from SMM. In VariableServicesSetVariable (), it uses StrSize () to get variable name size, uses StrLen () to get variable name length and uses StrCmp () to compare strings. These actions may cause a buffer over-read.

Affected products

Insydeh2O: from 5.2 before 5.2.05.29.50; from 5.3 before 5.3.05.38.50; from 5.4 before 5.4.05.46.50; from 5.5 before 5.5.05.54.50; from 5.6 before 5.6.05.61.50; from 5.7 before 5.7.05.70.50 — fixed in 5.2.05.29.50, 5.3.05.38.50, 5.4.05.46.50, 5.5.05.54.50, 5.6.05.61.50, 5.7.05.70.50

How to fix

Upgrade to a fixed version: Insydeh2O 5.2.05.29.50, 5.3.05.38.50, 5.4.05.46.50, 5.5.05.54.50. Check the vendor advisory for mitigations.

References

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