# CVE-2025-5372: Libssh: incorrect return code handling in ssh_kdf() in libssh CVE-2025-5372 is fixed in 5 products on 1 platform, first by libssh-4 0.9.6-2ubuntu0.22.04.4, released June 24, 2025. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2025-5372 - Priority: High - CVSS: 8.8 (Moderate) - EPSS: 0.0051 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jun 24, 2025 - Weakness: Incorrect Calculation - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-5372 ## Description A flaw was found in libssh versions built with OpenSSL versions older than3.0, specifically in the ssh_kdf() function responsible for key derivation.Due to inconsistent interpretation of return values where OpenSSL uses 0 toindicate failure and libssh uses 0 for success—the function may mistakenlyreturn a success status even when key derivation fails. This results inuninitialized cryptographic key buffers being used in subsequentcommunication, potentially compromising SSH sessions' confidentiality,integrity, and availability. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libssh Debian 12.15 (bookworm) | 0.10.6-0+deb12u2 | [DEBIAN-CVE-2025-5372](https://patchblox.com/security/data/fix/linux/debian-cve-2025-5372.md) | Jul 4, 2025 | | Linux | libssh Debian 13.5 (trixie) | 0.11.2-1 | [DEBIAN-CVE-2025-5372](https://patchblox.com/security/data/fix/linux/debian-cve-2025-5372.md) | Jul 4, 2025 | | Linux | libssh Debian 14 | 0.11.2-1 | [DEBIAN-CVE-2025-5372](https://patchblox.com/security/data/fix/linux/debian-cve-2025-5372.md) | Jul 4, 2025 | | Linux | libssh RHEL 8 | 0:0.9.6-16.el8_10 | [RHSA-2025:21977](https://patchblox.com/security/data/fix/linux/rhsa-2025-21977.md) | Nov 24, 2025 | | Linux | libssh almalinux 8 | 0.9.6-16.el8_10 | [ALSA-2025:21977](https://patchblox.com/security/data/fix/linux/alsa-2025-21977.md) | Nov 24, 2025 | | Linux | libssh ol 8 | 0:0.9.6-16.el8_10 | [ELSA-2025-21977](https://patchblox.com/security/data/fix/linux/elsa-2025-21977.md) | Nov 24, 2025 | | Linux | libssh opensuse-leap 15.6 | 0.9.8-150600.11.3.1 | [SUSE-SU-2025:02229-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02229-1.md) | Jul 4, 2025 | | Linux | libssh rocky 8 | 0:0.9.6-16.el8_10 | [RLSA-2025:21977](https://patchblox.com/security/data/fix/linux/rlsa-2025-21977.md) | Nov 25, 2025 | | Linux | libssh sles 15.6 | 0.9.8-150600.11.3.1 | [SUSE-SU-2025:02229-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02229-1.md) | Jul 4, 2025 | | Linux | libssh sles 15.7 | 0.9.8-150600.11.3.1 | [SUSE-SU-2025:02229-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02229-1.md) | Jul 4, 2025 | | Linux | libssh-4 Ubuntu 22.04.1 LTS (jammy) | 0.9.6-2ubuntu0.22.04.4 | [libssh-4 0.9.6-2ubuntu0.22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libssh-4-0.9.6-2ubuntu0.22.04.4.md) | Jun 24, 2025 | | Linux | libssh-4 Ubuntu 24.04.5 LTS (noble) | 0.10.6-2ubuntu0.1 | [libssh-4 0.10.6-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libssh-4-0.10.6-2ubuntu0.1.md) | Jun 24, 2025 | | Linux | libssh-4 Ubuntu 24.10 (oracular) | 0.10.6-3ubuntu1.1 | [libssh-4 0.10.6-3ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libssh-4-0.10.6-3ubuntu1.1.md) | Jun 25, 2025 | | Linux | libssh-4 Ubuntu 25.04 (plucky) | 0.11.1-1ubuntu0.1 | [libssh-4 0.11.1-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libssh-4-0.11.1-1ubuntu0.1.md) | Jun 25, 2025 | | Linux | libssh-config RHEL 8 | 0:0.9.6-16.el8_10 | [RHSA-2025:21977](https://patchblox.com/security/data/fix/linux/rhsa-2025-21977.md) | Nov 24, 2025 | | Linux | libssh-config almalinux 8 | 0.9.6-16.el8_10 | [ALSA-2025:21977](https://patchblox.com/security/data/fix/linux/alsa-2025-21977.md) | Nov 24, 2025 | | Linux | libssh-config ol 8 | 0:0.9.6-16.el8_10 | [ELSA-2025-21977](https://patchblox.com/security/data/fix/linux/elsa-2025-21977.md) | Nov 24, 2025 | | Linux | libssh-devel RHEL 8 | 0:0.9.6-16.el8_10 | [RHSA-2025:21977](https://patchblox.com/security/data/fix/linux/rhsa-2025-21977.md) | Nov 24, 2025 | | Linux | libssh-devel almalinux 8 | 0.9.6-16.el8_10 | [ALSA-2025:21977](https://patchblox.com/security/data/fix/linux/alsa-2025-21977.md) | Nov 24, 2025 | | Linux | libssh-devel ol 8 | 0:0.9.6-16.el8_10 | [ELSA-2025-21977](https://patchblox.com/security/data/fix/linux/elsa-2025-21977.md) | Nov 24, 2025 | | Linux | libssh-gcrypt-4 Ubuntu 22.04.1 LTS (jammy) | 0.9.6-2ubuntu0.22.04.4 | [libssh-gcrypt-4 0.9.6-2ubuntu0.22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libssh-gcrypt-4-0.9.6-2ubuntu0.22.04.4.md) | Jun 24, 2025 | | Linux | libssh-gcrypt-4 Ubuntu 24.04.5 LTS (noble) | 0.10.6-2ubuntu0.1 | [libssh-gcrypt-4 0.10.6-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libssh-gcrypt-4-0.10.6-2ubuntu0.1.md) | Jun 24, 2025 | | Linux | libssh-gcrypt-4 Ubuntu 24.10 (oracular) | 0.10.6-3ubuntu1.1 | [libssh-gcrypt-4 0.10.6-3ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libssh-gcrypt-4-0.10.6-3ubuntu1.1.md) | Jun 25, 2025 | --- Data as of 2026-11-08T00:53:09Z UTC. 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