Amazon Linux 2 : wireshark (ALAS-2026-4006)

high Nessus Plugin ID 371794

Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of wireshark installed on the remote host is prior to 2.6.2-15. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-4006 advisory.

SCTP protocol dissector crash in 4.6.0 to 4.6.8 and 4.4.0 to 4.4.18 allows denial of service (CVE-2026-95389)

Heap buffer overflow (WRITE) in CSN.1 dissector -- CSN_RECURSIVE_ARRAY writes past destination array with no capacity check (packet-csn1.c). (CVE-2026-95393)

The X11 dissector caches, per TCP conversation, one keysym array per keycode in x11_conv_data_t.keycodemap[256]. Each array is allocated in listOfKeysyms() with the keysyms-per-keycode width in force for the message being dissected, but the dissector records only a single scalar state->keysyms_per_keycode, with no per-array width. The X_ChangeKeyboardMapping request writes entries with a request-local width and leaves the scalar untouched; the X_GetKeyboardMapping reply sets the scalar. The two therefore diverge. When a later KeyPress/KeyRelease event is dissected, keycode2keysymString() indexes the cached arrays with the current scalar and never consults each array's real length, so any array allocated narrower than the scalar is read out of bounds. This is reachable from a capture with the default configuration (the X11 dissector is registered on TCP 6000-6063 and enabled by default; no protocol preference or key is required). (CVE-2026-96423)

Tenable has extracted the preceding description block directly from the tested product 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

Run 'yum update wireshark' or or 'yum update --advisory ALAS2-2026-4006' to update your system.

Plugin Details

Severity: High

ID: 371794

File Name: al2_ALAS-2026-4006.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 10/24/2026

Updated: 10/24/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.46

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

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

CVSS Score Source: CVE-2026-95393

CVSS v3

Risk Factor: High

Base Score: 7.1

Temporal Score: 6.4

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

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

CVSS Score Source: CVE-2026-96423

Vulnerability Information

CPE: cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:wireshark-cli, p-cpe:/a:amazon:linux:wireshark-debuginfo, p-cpe:/a:amazon:linux:wireshark-devel, p-cpe:/a:amazon:linux:wireshark

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/24/2026

Vulnerability Publication Date: 10/8/2024

Reference Information

CVE: CVE-2026-95389, CVE-2026-95393, CVE-2026-96423

IAVB: 2026-B-0286

Detections

Analytics