Intel TDX firmware: Improper buffer restrictions in TDX firmware reachable by a privileged host user for privilege

Impact

Improper buffer restrictions in TDX firmware reachable by a privileged host user for privilege escalation. Bundled with the other 2025 TDX firmware fixes.

Who can reach it

Privileged host user.

What to do

Update the Intel TDX module. The TDX module is loaded by the SEAM loader at boot, so the practical rollout is: stage the new module, drain every trust domain off the node, and reboot. It is not a live-patchable component and running TDs cannot be migrated through it. After the update, every TD must re-attest because the TDX module SVN is part of the attestation report - so anything that pinned the old measurement will fail until you update your attestation policy too. No OEM BIOS release needed for the module itself, which makes this materially faster than a platform firmware update.

References