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libtpms EUVDEUVD-2026-71627

| CVE-2026-85769 MEDIUM
Out-of-bounds Read (CWE-125)
2026-09-04 redhat GHSA-8pv5-2vvh-f478
6.5
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
6.5 MEDIUM
AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
6.5 MEDIUM

Adjacent vector because crafted state blob must be supplied during migration/restore; no auth to library required; impact is availability-only (confirmed by vendor).

3.1 AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Red Hat
6.5 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

4
Metadata Corrected
Sep 04, 2026 - 18:40 vuln.today
tag: Information Disclosure removed
Source Code Evidence Fetched
Sep 04, 2026 - 18:21 vuln.today
Analysis Generated
Sep 04, 2026 - 18:21 vuln.today
CVE Published
Sep 04, 2026 - 17:48 cve.org
MEDIUM 6.5

DescriptionCVE.org

A flaw was found in libtpms, a library that provides software TPM 2.0 emulation. When restoring TPM 2.0 state (for example during a virtual machine's power-on or state/migration restore), a malformed state blob can supply an oversized skip-block length that is not validated against the remaining size of the input buffer. This can drive an internal size counter negative, which bypasses a subsequent bounds check due to an unsafe signed-to-unsigned conversion, causing the parser to read memory outside the bounds of the heap buffer holding the state data. Successful exploitation can crash the process hosting libtpms (such as swtpm), resulting in a denial of service of the emulated TPM device and the virtual machine that depends on it. No data corruption or information disclosure was confirmed.

AnalysisAI

Heap out-of-bounds read in libtpms during TPM 2.0 state restoration allows an adjacent unauthenticated attacker to crash the swtpm process and deny TPM services to dependent virtual machines. The flaw arises in the state-blob parser: an attacker-controlled oversized skip-block length drives the internal INT32 size counter negative; subsequent bounds checks cast that counter to UINT32, wrapping it to a large positive value and bypassing the check, which then drives the parser to read memory outside the heap buffer. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires the ability to supply a malformed TPM state blob to the libtpms state-restore code path. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS vector AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (score 6.5) is well-calibrated. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the upstream fix from commit b1462888180d896af03cae0487e8d45009cc445e in the libtpms repository. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Micro 5.3 Affected
SUSE Linux Enterprise Micro 5.4 Affected
SUSE Linux Enterprise Micro 5.5 Affected
SUSE Linux Enterprise Module for Server Applications 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected

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EUVD-2026-71627 vulnerability details – vuln.today

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