CVE-2026-6727
Publication date 13 August 2026
Last updated 14 August 2026
Ubuntu priority
Description
A timing side-channel vulnerability exists in the RSA OAEP decryption implementation. A privileged local attacker with access to the TPM command interface may be able to exploit timing differences to recover information that could allow decryption of ciphertexts encrypted to TPM-managed RSA keys, including the RSA Endorsement Key (EK), including import blobs, credential blobs, and session salts. Under certain conditions, this may also enable the forgery of TPM 2.0 attestations. Refer to TCGVRT0011.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| libtpms | 26.04 LTS resolute |
Needs evaluation
|
| 24.04 LTS noble |
Needs evaluation
|
|
| 22.04 LTS jammy |
Needs evaluation
|
Severity score breakdown
CVSS version: CVSS v3.0
Base score
5.9 · Medium
Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
References
Other references
- https://www.cve.org/CVERecord?id=CVE-2026-6727
- https://groups.google.com/g/libtpms-announce/c/xB2PqSQRA_8
- https://trustedcomputinggroup.org/about/security/
- https://trustedcomputinggroup.org/wp-content/uploads/Extended-vrt0010-11-guidance_V1.pdf
- https://trustedcomputinggroup.org/wp-content/uploads/VRT0011-Advisory_Final-1.pdf