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CVE-2026-6727

CVE-2026-6727

5.9 Medium

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.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.15%Unchanged since Aug 12, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.9

CVE-2026-6727

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.

Record
CVE-2026-6727
CVSS 3.1
5.9 MediumCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Weakness
CWE-208
Updated
2026-11-02
EUVDEUVD-2026-56223 5.9

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.

Record
EUVD-2026-56223
CVSS 3.1
5.9 MediumCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-fv5r-gp2c-7mwv 5.9

A timing side-channel vulnerability exists in the RSA OAEP decryption implementation. A...

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.

Record
GHSA-fv5r-gp2c-7mwv
CVSS 3.1
5.9 MediumCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Weakness
CWE-208
Updated
2026-11-02
NVD 5.9

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.

Record
CVE-2026-6727
CVSS 3.1
5.9 MediumCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Weakness
CWE-208
Updated
2026-11-02
OSVDEBIAN-CVE-2026-6727 5.9

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.

Record
DEBIAN-CVE-2026-6727
CVSS 3.1
5.9 MediumCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2026-6727 5.9

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.

Record
UBUNTU-CVE-2026-6727
CVSS 3.1
5.9 MediumCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
libtpms
Debian:12
All versions, plus listed versions
0.10.1-10.10.1-20.10.2-10.10.2-20.10.2-3
Show 6 moreShow less
0.10.2-40.10.2-50.9.2-3.10.9.2-3.1+deb12u10.9.2-3.20.9.2-3.2+hurd.1
None known
libtpms
Debian:13
All versions, plus listed versions
0.10.1-10.10.1-20.10.2-10.10.2-20.10.2-3
Show 4 moreShow less
0.10.2-40.10.2-50.9.2-3.20.9.2-3.2+hurd.1
None known
libtpms
Debian:14
All versions, plus listed versions
0.10.1-10.10.1-20.10.2-10.10.2-20.10.2-3
Show 4 moreShow less
0.10.2-40.10.2-50.9.2-3.20.9.2-3.2+hurd.1
None known
libtpms
Ubuntu:22.04:LTS
All versions, plus listed versions
0.8.2-1ubuntu10.9.0-0ubuntu10.9.0-0ubuntu20.9.0-0ubuntu30.9.0-0ubuntu40.9.3-0ubuntu10.9.3-0ubuntu1.22.04.10.9.3-0ubuntu1.22.04.2
None known
libtpms
Ubuntu:24.04:LTS
All versions, plus listed versions
0.9.3-0ubuntu20.9.3-0ubuntu30.9.3-0ubuntu40.9.3-0ubuntu4.24.04.1
None known
libtpms
Ubuntu:26.10
All versions, plus listed versions
0.10.2-2ubuntu10.10.2-2ubuntu20.10.2-5ubuntu1
None known
libtpms
Ubuntu:26.04:LTS
All versions, plus listed versions
0.9.3-0ubuntu50.10.1-2ubuntu10.10.2-1ubuntu10.10.2-2ubuntu1
None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-6727 is a medium vulnerability (CVSS 5.9) in Trusted Computing Group Tpm2.0, published August 11, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.15%, the 4th percentile. No source names a fixed version.

References

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