Out-of-bounds write in libtpms
Priority LOW 27CWE-787Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Low · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.
Summary
A flaw was found in libtpms. The flaw can be triggered by specially-crafted TPM 2 command packets containing illegal values and may lead to an out-of-bounds access when the volatile state of the TPM 2 is marshalled/written or unmarshalled/read. The highest threat from this vulnerability is to system availability.
Why it matters now
EPSS 0.00321 25th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
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 | Fixed-In - libtpms 0.6.5, libtpms 0.7.8, libtpms 0.8.4 | — | No fix listed | CNA |
- libtpms Vendor— Affected Fixed-In - libtpms 0.6.5, libtpms 0.7.8, libtpms 0.8.4 Fixed in — No fix listed CNA
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:libtpms_project:libtpms:*:*:*:*:*:*:*:* | before 0.6.5; 0.7.0 to before 0.7.8; 0.8.0 to before 0.8.4 | Vulnerable | Libtpms Project |
| cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:advanced_virtualization:*:*:* | 8.0 | Vulnerable | Red Hat |
| cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* | 34 | Vulnerable | Fedoraproject |
- cpe:2.3:a:libtpms_project:libtpms:*:*:*:*:*:*:*:* Versions before 0.6.5; 0.7.0 to before 0.7.8; 0.8.0 to before 0.8.4 Vulnerable ·Libtpms Project
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:advanced_virtualization:*:*:* Versions 8.0 Vulnerable ·Red Hat
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* Versions 34 Vulnerable ·Fedoraproject
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-2021-3623
- 2026-10-03 Alias added: GHSA-6527-9qhc-39j4
References
Patch 4
Sources
- CVE-2021-3623 · CVE Program
- CVE-2021-3623 · NVD
- FIRST EPSS
- GHSA-6527-9qhc-39j4 · GitHub Advisory Database · CC BY 4.0
- CVE-2021-3623 · Red Hat security data · CC BY 4.0
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