CVE-2026-21444

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.

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.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.