An issue was discovered in AhciBusDxe in Insyde InsydeH2O with kernel 5.1 through 5.5. An SMM memory corruption vulnerability allows an attacker to write fixed or predictable data to SMRAM. Exploiting this issue could lead to escalating privileges to SMM.
https://www.insyde.com/security-pledge/SA-2022011
https://www.insyde.com/security-pledge
https://security.netapp.com/advisory/ntap-20220216-0011/
https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf