SB2026012945 - Multiple vulnerabilities in IBM PowerVM Hypervisor

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Main Vulnerability Database SB2026012945

SB2026012945 - Multiple vulnerabilities in IBM PowerVM Hypervisor

Published: January 29, 2026

Security Bulletin ID SB2026012945
Severity
Low
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 secuirty vulnerabilities.


1) Out-of-bounds read (CVE-ID: CVE-2025-49133)

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary condition within the CryptHmacSign() function. A local user can trigger an out-of-bounds read error by sending malicious commands to a TPM 2.0/vTPM (swtpm) whose firmware is based on an affected TCG reference implementation and make vTPM (swtpm) unavailable to a VM.


2) Out-of-bounds read (CVE-ID: CVE-2025-2884)

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary condition within the CryptHmacSign helper function of TCG TPM2.0 Reference implementation. A local user can trigger an out-of-bounds read error and perform a denial of service (DoS) attack.


Remediation

Install update from vendor's website.

References