Existing CommBuffer checks in SmmEntryPoint will not catch underflow when computing BufferSize. Reference: https://bugzilla.tianocore.org/show_bug.cgi?id=3387
Created edk2 tracking bugs for this issue: Affects: epel-7 [bug 2096378] Affects: fedora-all [bug 2096379]
https://edk2.groups.io/g/devel/message/90516
This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2023:2165 https://access.redhat.com/errata/RHSA-2023:2165
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2021-38578