Detections
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Amazon Linux 2023 : gvfs, gvfs-archive, gvfs-client (ALAS2023-2026-3120)

high Nessus Plugin ID 351058

Synopsis

The remote Amazon Linux 2023 host is missing a security update.

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-3120 advisory.

 A flaw was found in the SFTP backend in gvfs. When mounting a share and reading a file, a malicious SFTP server can cause read_reply() to process a length that exceeds the size requested by the client. The function does not verify the server-provided length against the allocated buffer size, causing the operation to write past the intended boundaries. This issue allows a malicious server to corrupt adjacent heap memory in the gvfsd-sftp process, resulting in a denial of service as the process aborts upon detecting the heap corruption or potentially allowing arbitrary code execution. (CVE-2026-84268)

 A flaw was found in the admin backend of gvfs. The privileged gvfsd-admin daemon changes the ownership of newly created private D-Bus sockets by calling the link-following chown() function on a pathname inside a user-controlled directory. A local attacker can exploit this via a Time-of-Check Time-of-Use (TOCTOU) race condition and exchange the socket pathname with a symbolic link pointing to an arbitrary root-owned file (such as /etc/pam.d/su). The daemon subsequently follows the symlink and changes the ownership of the targeted root-owned file to the attacker's user ID. This allows an authenticated local attacker to modify critical system files, leading to a full local privilege escalation to root. (CVE-2026-88924)

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 'dnf update gvfs --releasever 2023.12.20260928' or or 'dnf update --advisory ALAS2023-2026-3120 --releasever 2023.12.20260928' to update your system.

See Also

https://alas.aws.amazon.com//AL2023/ALAS2023-2026-3120.html

https://alas.aws.amazon.com/faqs.html

https://explore.alas.aws.amazon.com/CVE-2026-84268.html

https://explore.alas.aws.amazon.com/CVE-2026-88924.html

Plugin Details

Severity: High

ID: 351058

File Name: al2023_ALAS2023-2026-3120.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 9/29/2026

Updated: 9/29/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.26

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-84268

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

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

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

Vulnerability Information

CPE: cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:gvfs-archive-debuginfo, p-cpe:/a:amazon:linux:gvfs-archive, p-cpe:/a:amazon:linux:gvfs-client-debuginfo, p-cpe:/a:amazon:linux:gvfs-client, p-cpe:/a:amazon:linux:gvfs-debuginfo, p-cpe:/a:amazon:linux:gvfs-debugsource, p-cpe:/a:amazon:linux:gvfs-fuse-debuginfo, p-cpe:/a:amazon:linux:gvfs-fuse, p-cpe:/a:amazon:linux:gvfs-goa-debuginfo, p-cpe:/a:amazon:linux:gvfs-goa, p-cpe:/a:amazon:linux:gvfs-nfs-debuginfo, p-cpe:/a:amazon:linux:gvfs-nfs, p-cpe:/a:amazon:linux:gvfs-smb-debuginfo, p-cpe:/a:amazon:linux:gvfs-smb, p-cpe:/a:amazon:linux:gvfs

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

Exploit Ease: No known exploits are available

Patch Publication Date: 9/29/2026

Vulnerability Publication Date: 9/1/2026

Reference Information

CVE: CVE-2026-84268, CVE-2026-88924