CVE-2026-6727 Trusted Computing Group CVE debrief

Who should care

Defenders responsible for systems using TPM-managed RSA keys should assess the vulnerability's impact and prioritize verification and potential mitigations. This includes operators, platform administrators, vulnerability management teams, and security teams who manage TPM 2.0 attestations and RSA keys.

Why it matters

A timing side-channel vulnerability in RSA OAEP decryption implementation may allow local attackers to recover information and decrypt TPM-managed RSA keys, potentially enabling forgery of TPM 2.0 attestations. Defenders should prioritize verification and mitigation efforts for systems using TPM-managed RSA keys.

• Verification of vulnerability impact on systems using TPM-managed RSA keys
• Potential decryption of ciphertexts encrypted to TPM-managed RSA keys
• Forgery of TPM 2.0 attestations under certain conditions
• Assessment of mitigation or update needs

Technical summary

A timing side-channel vulnerability exists in the RSA OAEP decryption implementation, which may allow a privileged local attacker to recover information and potentially decrypt ciphertexts encrypted to TPM-managed RSA keys, including the RSA Endorsement Key (EK), import blobs, credential blobs, and session salts. Under certain conditions, this may also enable the forgery of TPM 2.0 attestations. The vulnerability affects systems using TPM-managed RSA keys, and defenders should prioritize verifying the vulnerability's impact on their systems and assess the need for updates or mitigations.

Defensive priority

Defenders should prioritize verifying the vulnerability's impact on their systems, especially those using TPM-managed RSA keys, and assess the need for updates or mitigations.

Recommended defensive actions

• Verify the vulnerability's impact on systems using TPM-managed RSA keys
• Assess the need for updates or mitigations
• Monitor for potential exploitation attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but the scope of affected systems and specific remediation steps require further verification from official sources. Affected systems include those using TPM-managed RSA keys, and defenders should verify the vulnerability's impact on their systems, especially those with TPM 2.0 attestations. The vulnerability's impact on systems using TPM-managed RSA keys should be assessed, and potential mitigations should be prioritized.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.