Memory corruption in libtpms
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-119 and the CVSS impact.
Summary
A flaw was found in the libtpms code that may cause access beyond the boundary of internal buffers. The vulnerability is triggered by specially-crafted TPM2 command packets that then trigger the issue when the state of the TPM2's volatile state is written. The highest threat from this vulnerability is to system availability. This issue affects libtpms versions before 0.8.5, before 0.7.9 and before 0.6.6.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | libtpms | libtpms 0.8.5, libtpms 0.7.9, libtpms 0.6.6 | — | No fix listed | CNA |
- libtpms Vendor— Affected libtpms 0.8.5, libtpms 0.7.9, libtpms 0.6.6 Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:libtpms_project:libtpms:*:*:*:*:*:*:*:* | 0.6.0 to before 0.6.6; 0.7.0 to before 0.7.9; 0.8.0 to before 0.8.5 | Vulnerable | Libtpms Project |
| cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* | 34 | Vulnerable | Fedoraproject |
| cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:-:*:*:* | 8.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:advanced_virtualization:*:*:* | 8.0 | Vulnerable | Red Hat |
- cpe:2.3:a:libtpms_project:libtpms:*:*:*:*:*:*:*:* Versions 0.6.0 to before 0.6.6; 0.7.0 to before 0.7.9; 0.8.0 to before 0.8.5 Vulnerable ·Libtpms Project
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* Versions 34 Vulnerable ·Fedoraproject
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:-:*:*:* Versions 8.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:advanced_virtualization:*:*:* Versions 8.0 Vulnerable ·Red Hat
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 8 Advanced Virtualization | Affected | No fix yet |
Not affected: 1 product
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2021-3746
- 2026-10-03 Alias added: GHSA-9ffq-6fp7-34mv
References
Sources
- CVE-2021-3746 · CVE Program
- CVE-2021-3746 · NVD
- FIRST EPSS
- GHSA-9ffq-6fp7-34mv · GitHub Advisory Database · CC BY 4.0
- CVE-2021-3746 · Red Hat security data · CC BY 4.0
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