Intel TDX SEAM loader (Seamldr): MULTI-TENANT ISOLATION: Sensitive information is not cleared before a resource

Impact

MULTI-TENANT ISOLATION: Sensitive information is not cleared before a resource is reused in the SEAM loader - the component that loads and measures the TDX module itself. Anything wrong at the SEAM loader layer is below the TDX module in the trust stack, so it undermines the measurement every TD attestation ultimately chains to.

Who can reach it

Privileged host user.

What to do

Update the TDX SEAM loader (Seamldr) to 1.5.02.00 or later alongside the TDX module. Loaded at boot, so drain all trust domains and reboot the node. Re-attest afterwards; the SEAM loader version feeds the attestation chain. No OEM BIOS dependency for the loader itself.

References