Alibaba Cloud Linux 3 : 0089: cloud-kernel bugfix, enhancement and (ALINUX3-SA-2026:0089)

high Nessus Plugin ID 314238

Synopsis

The remote Alibaba Cloud Linux host is missing one or more security updates.

Description

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by a vulnerability as referenced in the ALINUX3-SA-2026:0089 advisory.

Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

CVE-2026-43284:
The Dirty Frag vulnerability is a local privilege escalation (LPE) issue in the Linux kernel that combines flaws in the ESP/XFRM and RXRPC subsystems to allow an unprivileged local attacker to gain root access on major Linux distributions (using any of these two: ESP/XFRM or RXRPC flaws). The attack abuses kernel page-cache manipulation and network protocol handling to overwrite privileged binaries and execute arbitrary code with elevated privileges. Exploitation differs by distribution: the ESP issue affects systems permitting unprivileged user namespaces, while the RXRPC issue impacts distributions with RXRPC enabled, such as Ubuntu. Together, the vulnerabilities provide broad cross-distribution root compromise capability, with mitigations involving disabling vulnerable kernel modules (esp4, esp6, and rxrpc) until upstream patches are fully merged and deployed.

Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux security advisory.

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

Solution

Update the affected packages.

Plugin Details

Severity: High

ID: 314238

File Name: alinux3_sa_2026-0089.nasl

Version: 1.2

Type: Local

Family: Alibaba Cloud Linux Local Security Checks

Published: 5/11/2026

Updated: 5/12/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 10.0

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.9

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

CVSS Score Source: CVE-2026-43284

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.5

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

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

Vulnerability Information

CPE: p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:kernel-debug-core, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:kernel-tools, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:bpftool, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:kernel-debug-modules-internal, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:kernel-core, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:perf, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:kernel-tools-libs-devel, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:python3-perf, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:kernel-debug, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:kernel-devel, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:kernel-modules, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:kernel-tools-libs, cpe:/o:alibabacloud:alibaba_cloud_linux_3, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:kernel-debug-modules, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:kernel-debug-devel, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:kernel-headers, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:kernel-modules-extra, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:kernel-debug-modules-extra, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:kernel, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:kernel-modules-internal

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/10/2026

Vulnerability Publication Date: 5/8/2026

Reference Information

CVE: CVE-2026-43284

Detections

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