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Linux Distros Unpatched Vulnerability : CVE-2026-57226

critical Nessus Plugin ID 344760

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.

 - The vulnerability exists due to a use-after-free (UAF) condition inside the TCP stream reassembly layer.
 When a connection undergoes abrupt termination sequences (such as an interleaving flood of RST and FIN packets), the flow tracking engine frees network payload metadata objects prematurely while active parsing references are still attached. (CVE-2026-57226)

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://security-tracker.debian.org/tracker/CVE-2026-57226

Plugin Details

Severity: Critical

ID: 344760

File Name: unpatched_CVE_2026_57226.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Misc.

Published: 9/11/2026

Updated: 9/11/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.63

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-2026-57226

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:13.0, p-cpe:/a:debian:debian_linux:suricata

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: 7/23/2026

Reference Information

CVE: CVE-2026-57226