Out-of-bounds Read Affecting virt:rhel/qemu-kvm-block-ssh package, versions <15:6.2.0-53.module_el8.10.0+4031+06966654.4


Severity

Recommended
0.0
medium
0
10

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.12% (30th percentile)

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  • Snyk IDSNYK-ALMALINUX8-VIRT-16012012
  • published13 Apr 2026
  • disclosed4 Aug 2025

Introduced: 4 Aug 2025

CVE-2025-49133  (opens in a new tab)
CWE-125  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:8 virt:rhel/qemu-kvm-block-ssh to version 15:6.2.0-53.module_el8.10.0+4031+06966654.4 or higher.
This issue was patched in ALSA-2025:12527.

NVD Description

Note: Versions mentioned in the description apply only to the upstream virt:rhel/qemu-kvm-block-ssh package and not the virt:rhel/qemu-kvm-block-ssh package as distributed by AlmaLinux. See How to fix? for AlmaLinux:8 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1