Incorrect Calculation Affecting libssh package, versions <0:0.9.6-16.el8_10


Severity

Recommended
medium

Based on Oracle Linux security rating.

Threat Intelligence

EPSS
0.31% (55th percentile)

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  • Snyk IDSNYK-ORACLE8-LIBSSH-14111850
  • published25 Nov 2025
  • disclosed4 Jul 2025

Introduced: 4 Jul 2025

CVE-2025-5372  (opens in a new tab)
CWE-682  (opens in a new tab)

How to fix?

Upgrade Oracle:8 libssh to version 0:0.9.6-16.el8_10 or higher.
This issue was patched in ELSA-2025-21977.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libssh package and not the libssh package as distributed by Oracle. See How to fix? for Oracle:8 relevant fixed versions and status.

A flaw was found in libssh versions built with OpenSSL versions older than 3.0, specifically in the ssh_kdf() function responsible for key derivation. Due to inconsistent interpretation of return values where OpenSSL uses 0 to indicate failure and libssh uses 0 for success—the function may mistakenly return a success status even when key derivation fails. This results in uninitialized cryptographic key buffers being used in subsequent communication, potentially compromising SSH sessions' confidentiality, integrity, and availability.

CVSS Base Scores

version 3.1