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).
CVSS v4.0 Metrics
Exploitability
Attack VectorLocal
ComplexityLow
RequirementsPresent
PrivilegesHigh
User InteractionNone
Threat
Exploit MaturityUnreported
Vulnerable System
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Subsequent System
ConfidentialityNone
IntegrityNone
AvailabilityNone
Supplemental
SafetyNegligible
AutomatableYes
RecoveryAutomatic
Value DensityConcentrated
UrgencyMedium
Change Log
| Date | Source | Changes | Score |
|---|
| 2026-07-21 | nvd | AV: P→L, AC: H→L, UI: A→N, VC: N→H, VI: N→H, VA: N→H | 0.0 → 4.0 |
| 2026-07-21 | cve.org | initial, patch: Unavailable | 0.0 |
Affected Software
| Vendor | Product | Version |
|---|
| insyde | insydeh2o | ≥ 5.2, < 5.26.25 |
| insyde | insydeh2o | ≥ 5.4, < 5.43.25 |
| insyde | insydeh2o | ≥ 5.3, < 5.34.44 |
| insyde | insydeh2o | ≥ 5.2, < 5.25.44 |
| insyde | insydeh2o | ≥ 5.1, < 5.16.25 |
| insyde | insydeh2o | ≥ 5.4, < 5.42.44 |
| insyde | insydeh2o | ≥ 5.3, < 5.35.25 |
| siemens | ruggedcom_apr1808_firmware | All versions |
| siemens | simatic_field_pg_m5_firmware | All versions |
| siemens | simatic_field_pg_m6_firmware | All versions |
| siemens | simatic_ipc127e_firmware | All versions |
| siemens | simatic_ipc227g_firmware | All versions |
| siemens | simatic_ipc277g_firmware | All versions |
| siemens | simatic_ipc327g_firmware | All versions |
| siemens | simatic_ipc377g_firmware | All versions |
| siemens | simatic_ipc427e_firmware | All versions |
| siemens | simatic_ipc477e_firmware | All versions |
| siemens | simatic_ipc477e_pro_firmware | All versions |
| siemens | simatic_ipc627e_firmware | All versions |
| siemens | simatic_ipc647e_firmware | All versions |
| siemens | simatic_ipc677e_firmware | All versions |
| siemens | simatic_ipc847e_firmware | All versions |
| siemens | simatic_itp1000_firmware | All versions |
Published: 2021-06-16
