Description
An issue was discovered in SdHostDriver in Insyde InsydeH2O with kernel 5.1 before 05.16.25, 5.2 before 05.26.25, 5.3 before 05.35.25, 5.4 before 05.43.25, and 5.5 before 05.51.25. A vulnerability exists in the SMM (System Management Mode) branch that registers a SWSMI handler that does not sufficiently check or validate the allocated buffer pointer (CommBufferData).
Affected products
insyde: insydeh2o
References8
- www.insyde.com/security-pledge Vendor Advisory
- www.insyde.com/security-pledge Vendor Advisory
- cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf Third Party Advisory
- security.netapp.com/advisory/ntap-20220216-0004/ Third Party Advisory
- cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf Third Party Advisory
- security.netapp.com/advisory/ntap-20220216-0004/ Third Party Advisory
- www.kb.cert.org/vuls/id/796611
- cert-portal.siemens.com/productcert/html/ssa-306654.html
Metrics
- CVSS 3.1
-
8.2
HIGH
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 22 · as of 4 November 2026
- CWE
- CWE-787
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.