Detections
Analytics
Alibaba Cloud Linux 3 : 0109: xorg-x11-server (ALINUX3-SA-2026:0109)
high Nessus Plugin ID 315138
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 multiple vulnerabilities as referenced in the ALINUX3-SA-2026:0109 advisory.Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:
CVE-2026-33999:
A flaw was found in the X.Org X server. This integer underflow vulnerability, specifically in the XKB compatibility map handling, allows an attacker with local or remote X11 server access to trigger a buffer read overrun. This can lead to memory-safety violations and potentially a denial of service (DoS) or other severe impacts.
CVE-2026-34001:
A flaw was found in the X.Org X server. This use-after-free vulnerability occurs in the XSYNC fence triggering logic, specifically within the miSyncTriggerFence() function. An attacker with access to the X11 server can exploit this without user interaction, leading to a server crash and potentially enabling memory corruption. This could result in a denial of service or further compromise of the system.
CVE-2026-34003:
A flaw was found in the X.Org X server's XKB key types request validation. A local attacker could send a specially crafted request to the X server, leading to an out-of-bounds memory access vulnerability. This could result in the disclosure of sensitive information or cause the server to crash, leading to a Denial of Service (DoS). In certain configurations, higher impact outcomes may be possible.
Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux 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
Update the affected packages.See Also
http://mirrors.aliyun.com/alinux/3/cve/alinux3-sa-20260109.xml
Plugin Details
Severity: High
ID: 315138
File Name: alinux3_sa_2026-0109.nasl
Version: 1.1
Type: Local
Published: 5/18/2026
Updated: 5/18/2026
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.7
CVSS v2
Risk Factor: Medium
Base Score: 6.8
Temporal Score: 5
Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C
CVSS Score Source: CVE-2026-34003
CVSS v3
Risk Factor: High
Base Score: 7.8
Temporal Score: 6.8
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: cpe:/o:alibabacloud:alibaba_cloud_linux_3, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:xorg-x11-server-source, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:xorg-x11-server-doc, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:xorg-x11-server-common, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:xorg-x11-server-xnest, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:xorg-x11-server-xdmx, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:xorg-x11-server-xorg, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:xorg-x11-server-devel, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:xorg-x11-server-xvfb, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:xorg-x11-server-xephyr
Required KB Items: Host/local_checks_enabled, Host/Alibaba/release, Host/Alibaba/rpm-list, Host/cpu
Exploit Ease: No known exploits are available
Patch Publication Date: 5/13/2026
Vulnerability Publication Date: 4/14/2026