CVE-2025-49133

CVE Details

Release Date:	2025-06-10
Impact:	Moderate	What is this?

Description

Libtpms is a library that targets the integration of TPM functionality into hypervisors, primarily into Qemu. Libtpms, which is derived from the TPM 2.0 reference implementation code published by the Trusted Computing Group, is prone to a potential out of bounds (OOB) read vulnerability. The vulnerability occurs in the CryptHmacSign function with an inconsistent pairing of the signKey and signScheme parameters, where the signKey is ALG_KEYEDHASH key and inScheme is an ECC or RSA scheme. The reported vulnerability is in the CryptHmacSign function, which is defined in the "Part 4: Supporting Routines - Code" document, section "7.151 - /tpm/src/crypt/CryptUtil.c ". This vulnerability can be triggered from user-mode applications by sending malicious commands to a TPM 2.0/vTPM (swtpm) whose firmware is based on an affected TCG reference implementation. The effect on libtpms is that it will cause an abort due to the detection of the out-of-bounds access, thus for example making a vTPM (swtpm) unavailable to a VM. This vulnerability is fixed in 0.7.12, 0.8.10, 0.9.7, and 0.10.1.

See more information about CVE-2025-49133 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	5.9
Vector String:	CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:H
Version:	3.1
Attack Vector:	Local
Attack Complexity:	Low
Privileges Required:	Low
User Interaction:	Required
Scope:	Changed
Confidentiality Impact:	None
Integrity Impact:	None
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 8 (hivex)	ELSA-2025-12527	2025-08-04
Oracle Linux version 8 (libguestfs)	ELSA-2025-12527	2025-08-04
Oracle Linux version 8 (libguestfs-winsupport)	ELSA-2025-12527	2025-08-04
Oracle Linux version 8 (libiscsi)	ELSA-2025-12527	2025-08-04
Oracle Linux version 8 (libnbd)	ELSA-2025-12527	2025-08-04
Oracle Linux version 8 (libtpms)	ELSA-2025-12527	2025-08-04
Oracle Linux version 8 (libvirt)	ELSA-2025-12527	2025-08-04
Oracle Linux version 8 (libvirt-dbus)	ELSA-2025-12527	2025-08-04
Oracle Linux version 8 (libvirt-python)	ELSA-2025-12527	2025-08-04
Oracle Linux version 8 (nbdkit)	ELSA-2025-12527	2025-08-04
Oracle Linux version 8 (netcf)	ELSA-2025-12527	2025-08-04
Oracle Linux version 8 (perl-Sys-Virt)	ELSA-2025-12527	2025-08-04
Oracle Linux version 8 (qemu-kvm)	ELSA-2025-12527	2025-08-04
Oracle Linux version 8 (seabios)	ELSA-2025-12527	2025-08-04
Oracle Linux version 8 (sgabios)	ELSA-2025-12527	2025-08-04
Oracle Linux version 8 (supermin)	ELSA-2025-12527	2025-08-04
Oracle Linux version 8 (swtpm)	ELSA-2025-12527	2025-08-04
Oracle Linux version 8 (virt-v2v)	ELSA-2025-12527	2025-08-04
Oracle Linux version 9 (libtpms)	ELSA-2025-12100	2025-07-29