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Linux Distros Unpatched Vulnerability : CVE-2026-39827

medium Nessus Plugin ID 316590

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Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

 - An authenticated SSH client that repeatedly opened channels which were rejected by the server caused unbounded memory growth, eventually crashing the server process and affecting all connected users.
 Rejected channels are now properly removed from the connection's internal state and released for garbage collection. (CVE-2026-39827)

Note that Nessus relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

See Also

https://access.redhat.com/security/cve/cve-2026-39827

https://security-tracker.debian.org/tracker/CVE-2026-39827

https://ubuntu.com/security/CVE-2026-39827

Plugin Details

Severity: Medium

ID: 316590

File Name: unpatched_CVE_2026_39827.nasl

Version: 1.5

Type: Local

Agent: unix

Family: Misc.

Published: 5/25/2026

Updated: 10/15/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.73

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3.4

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

CVSS Score Source: CVE-2026-39827

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 6

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

Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:25.10, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, cpe:/o:centos:centos:8, cpe:/o:debian:debian_linux:12.0, cpe:/o:debian:debian_linux:13.0, cpe:/o:redhat:enterprise_linux:10, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:canonical:ubuntu_linux:golang-go.crypto, p-cpe:/a:canonical:ubuntu_linux:google-guest-agent, p-cpe:/a:canonical:ubuntu_linux:lxd, p-cpe:/a:canonical:ubuntu_linux:snapd, p-cpe:/a:centos:centos:buildah-tests, p-cpe:/a:centos:centos:buildah, p-cpe:/a:centos:centos:conmon, p-cpe:/a:centos:centos:containers-common, p-cpe:/a:centos:centos:gvisor-tap-vsock-gvforwarder, p-cpe:/a:centos:centos:gvisor-tap-vsock, p-cpe:/a:centos:centos:podman-catatonit, p-cpe:/a:centos:centos:podman-docker, p-cpe:/a:centos:centos:podman-gvproxy, p-cpe:/a:centos:centos:podman-manpages, p-cpe:/a:centos:centos:podman-plugins, p-cpe:/a:centos:centos:podman-remote, p-cpe:/a:centos:centos:podman-tests, p-cpe:/a:centos:centos:podman, p-cpe:/a:centos:centos:rhc-devel, p-cpe:/a:centos:centos:rhc, p-cpe:/a:centos:centos:skopeo-tests, p-cpe:/a:centos:centos:skopeo, p-cpe:/a:centos:centos:toolbox-tests, p-cpe:/a:centos:centos:toolbox, p-cpe:/a:centos:centos:trustee-kbs, p-cpe:/a:debian:debian_linux:golang-go.crypto, p-cpe:/a:redhat:enterprise_linux:buildah-tests, p-cpe:/a:redhat:enterprise_linux:buildah, p-cpe:/a:redhat:enterprise_linux:conmon, p-cpe:/a:redhat:enterprise_linux:containers-common, p-cpe:/a:redhat:enterprise_linux:gvisor-tap-vsock-gvforwarder, p-cpe:/a:redhat:enterprise_linux:gvisor-tap-vsock, p-cpe:/a:redhat:enterprise_linux:podman-catatonit, p-cpe:/a:redhat:enterprise_linux:podman-docker, p-cpe:/a:redhat:enterprise_linux:podman-gvproxy, p-cpe:/a:redhat:enterprise_linux:podman-manpages, p-cpe:/a:redhat:enterprise_linux:podman-plugins, p-cpe:/a:redhat:enterprise_linux:podman-remote, p-cpe:/a:redhat:enterprise_linux:podman-tests, p-cpe:/a:redhat:enterprise_linux:podman, p-cpe:/a:redhat:enterprise_linux:rhc-devel, p-cpe:/a:redhat:enterprise_linux:rhc, p-cpe:/a:redhat:enterprise_linux:skopeo-tests, p-cpe:/a:redhat:enterprise_linux:skopeo, p-cpe:/a:redhat:enterprise_linux:toolbox-tests, p-cpe:/a:redhat:enterprise_linux:toolbox, p-cpe:/a:redhat:enterprise_linux:trustee-kbs

Required KB Items: Host/local_checks_enabled, Host/cpu, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 5/22/2026

Reference Information

CVE: CVE-2026-39827