vulnerability
Alma Linux: CVE-2025-5372: Moderate: libssh security update (ALSA-2025-21977)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 6 | (AV:N/AC:M/Au:S/C:P/I:P/A:P) | Nov 24, 2025 | Dec 2, 2025 | Dec 2, 2025 |
Severity
6
CVSS
(AV:N/AC:M/Au:S/C:P/I:P/A:P)
Published
Nov 24, 2025
Added
Dec 2, 2025
Modified
Dec 2, 2025
Description
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.
Solutions
alma-upgrade-libsshalma-upgrade-libssh-configalma-upgrade-libssh-devel
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