Linux Distros Unpatched Vulnerability : CVE-2026-43226

critical Nessus Plugin ID 312786

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.

- net/rds: No shortcut out of RDS_CONN_ERROR RDS connections carry a state rds_conn_path::cp_state and transitions from one state to another and are conditional upon an expected state:
rds_conn_path_transition. There is one exception to this conditionality, which is RDS_CONN_ERROR that can be enforced by rds_conn_path_drop regardless of what state the condition is currently in. But as soon as a connection enters state RDS_CONN_ERROR, the connection handling code expects it to go through the shutdown-path. The RDS/TCP multipath changes added a shortcut out of RDS_CONN_ERROR straight back to RDS_CONN_CONNECTING via rds_tcp_accept_one_path (e.g. after rds_tcp_state_change). A subsequent rds_tcp_reset_callbacks can then transition the state to RDS_CONN_RESETTING with a shutdown-worker queued. That'll trip up rds_conn_init_shutdown, which was never adjusted to handle RDS_CONN_RESETTING and subsequently drops the connection with the dreaded DR_INV_CONN_STATE, which leaves RDS_SHUTDOWN_WORK_QUEUED on forever. So we do two things here: a) Don't shortcut RDS_CONN_ERROR, but take the longer path through the shutdown code. b) Add RDS_CONN_RESETTING to the expected states in rds_conn_init_shutdown so that we won't error out and get stuck, if we ever hit weird state transitions like this again. (CVE-2026-43226)

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

Solution

There is no known solution at this time.

Plugin Details

Severity: Critical

ID: 312786

File Name: unpatched_CVE_2026_43226.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Misc.

Published: 5/6/2026

Updated: 5/6/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.4

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

CVSS Score Source: CVE-2026-43226

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9

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

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

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:linux

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

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 5/6/2026

Reference Information

CVE: CVE-2026-43226

Detections

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