Skip to content
OpenAdvisories
Medium · 5.5 CVE-2026-21444 EUVD-2026-0753

libtpms returns wrong initialization vector when certain symmetric ciphers are used

Published Jan 2, 2026 · Updated Jan 5, 2026 · Assigned by GitHub_M

Description

libtpms, a library that provides software emulation of a Trusted Platform Module, has a flaw in versions 0.10.0 and 0.10.1. The commonly used integration of libtpms with OpenSSL 3.x contained a vulnerability related to the returned IV (initialization vector) when certain symmetric ciphers were used. Instead of returning the last IV it returned the initial IV to the caller, thus weakening the subsequent encryption and decryption steps. The highest threat from this vulnerability is to data confidentiality. Version 0.10.2 fixes the issue. No known workarounds are available.

Affected products

VendorProductAffectedFixed
stefanberger libtpms >= 0.10.0, < 0.10.2 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 14 libtpms 0.10.2-1 —
ReleasePackageFixed inAdvisory
openSUSE Tumbleweed libtpms 0.10.2-1.1 openSUSE-SU-2026:10422-1

Advisories 1

References