SB20261106117 - Fedora 43 update for tpm2-tss

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB20261106117

SB20261106117 - Fedora 43 update for tpm2-tss

Published: November 6, 2026

Security Bulletin ID SB20261106117
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Physical access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Integer underflow (CVE-ID: CVE-2026-109545)

CWE-ID: CWE-191 - Integer underflow

CVSSv4: 5.2 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows an unauthenticated attacker with physical access to the TPM bus to corrupt heap memory in applications using tpm2-tss.

The vulnerability exists due to unchecked subtraction in the SPI and I2C TCTI response handlers when a TPM response declares a size of six bytes or less. An unauthenticated attacker with physical access to the TPM bus can supply crafted responses that trigger oversized transfers of attacker-controlled data into the heap response buffer.


Remediation

Install update from vendor's website.

References