CVE-2026-21444
Description
A flaw was found in libtpms, a library for Trusted Platform Module (TPM) emulation. An attacker with low privileges could exploit this vulnerability when libtpms is integrated with OpenSSL 3.x and certain symmetric ciphers are used. The library incorrectly returns the initial Initialization Vector (IV) instead of the last one, weakening subsequent encryption and decryption operations and potentially compromising data confidentiality.
Statement
This vulnerability is rated Moderate for Red Hat. Red Hat Enterprise Linux and Red Hat In-Vehicle OS are not affected as the libtpms shipped with those products doesn't contain the vulnerable code. The flaw in libtpms, when integrated with OpenSSL 3.x, leads to incorrect Initialization Vector (IV) handling, potentially compromising data confidentiality in affected Fedora releases.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.5 | N/A | N/A |
| Attack Vector | Network | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | Low | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | High | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | None | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Application Data
If the IV is not properly initialized, data that is encrypted can be compromised and information about the data can be leaked. See [REF-1179].
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