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RockyLinux 8 : openssh (RLSA-2026:47755)

medium Nessus Plugin ID 330845

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Synopsis

The remote RockyLinux host is missing one or more security updates.

Description

The remote RockyLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:47755 advisory.

 * openssh: Local MITM of X11 forwarding via abstract UNIX socket pre-binding in Rocky Linux OpenSSH client versions (CVE-2026-55655)

 * openssh: Double free in Rocky Linux versions of OpenSSH DH-GEX client path during FIPS known-group validation leads to client-side denial of service (CVE-2026-55653)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

https://bugzilla.redhat.com/show_bug.cgi?id=2462250

https://bugzilla.redhat.com/show_bug.cgi?id=2462351

https://errata.rockylinux.org/RLSA-2026:47755

Plugin Details

Severity: Medium

ID: 330845

File Name: rocky_linux_RLSA-2026-47755.nasl

Version: 1.1

Type: Local

Published: 7/30/2026

Updated: 7/30/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.5

Percentile: 51.86

CVSS v2

Risk Factor: Medium

Base Score: 5.6

Temporal Score: 4.4

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:P/A:N

CVSS Score Source: CVE-2026-55655

CVSS v3

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 5.5

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:rocky:linux:8, p-cpe:/a:rocky:linux:openssh-askpass-debuginfo, p-cpe:/a:rocky:linux:openssh-askpass, p-cpe:/a:rocky:linux:openssh-cavs-debuginfo, p-cpe:/a:rocky:linux:openssh-cavs, p-cpe:/a:rocky:linux:openssh-clients-debuginfo, p-cpe:/a:rocky:linux:openssh-clients, p-cpe:/a:rocky:linux:openssh-debuginfo, p-cpe:/a:rocky:linux:openssh-debugsource, p-cpe:/a:rocky:linux:openssh-keycat-debuginfo, p-cpe:/a:rocky:linux:openssh-keycat, p-cpe:/a:rocky:linux:openssh-ldap-debuginfo, p-cpe:/a:rocky:linux:openssh-ldap, p-cpe:/a:rocky:linux:openssh-server-debuginfo, p-cpe:/a:rocky:linux:openssh-server, p-cpe:/a:rocky:linux:openssh, p-cpe:/a:rocky:linux:pam_ssh_agent_auth-debuginfo, p-cpe:/a:rocky:linux:pam_ssh_agent_auth

Required KB Items: Host/local_checks_enabled, Host/RockyLinux/release, Host/RockyLinux/rpm-list, Host/cpu

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/30/2026

Vulnerability Publication Date: 6/23/2026

Reference Information

CVE: CVE-2026-55653, CVE-2026-55655