Existing CommBuffer checks in SmmEntryPoint will not catch underflow when computing BufferSize.
The product writes to a buffer using an index or pointer that references a memory location prior to the beginning of the buffer.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Edk2 | Tianocore | * | 202202 (including) |
| Red Hat Enterprise Linux 9 | RedHat | edk2-0:20221207gitfff6d81270b5-9.el9_2 | * |
| Edk2 | Ubuntu | bionic | * |
| Edk2 | Ubuntu | esm-apps/bionic | * |
| Edk2 | Ubuntu | esm-apps/xenial | * |
| Edk2 | Ubuntu | esm-infra/focal | * |
| Edk2 | Ubuntu | focal | * |
| Edk2 | Ubuntu | impish | * |
| Edk2 | Ubuntu | jammy | * |
| Edk2 | Ubuntu | kinetic | * |
| Edk2 | Ubuntu | trusty | * |
| Edk2 | Ubuntu | xenial | * |