Detections
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RHEL 9 : freerdp (RHSA-2026:6340)
critical Nessus Plugin ID 304546
Synopsis
The remote Red Hat host is missing one or more security updates for freerdp.Description
The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:6340 advisory.FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license.
The xfreerdp client can connect to RDP servers such as Microsoft Windows machines, xrdp, and VirtualBox.
Security Fix(es):
* freerdp: FreeRDP heap-use-after-free (CVE-2026-22856)
* freerdp: FreeRDP heap-buffer-overflow (CVE-2026-22854)
* freerdp: FreeRDP heap-buffer-overflow (CVE-2026-22852)
* freerdp: FreeRDP: Denial of Service via FastGlyph parsing buffer overflow (CVE-2026-23732)
* freerdp: FreeRDP: Denial of Service via use-after-free in AUDIN format renegotiation (CVE-2026-24676)
* freerdp: FreeRDP has a heap-use-after-free in video_timer (CVE-2026-24491)
* freerdp: FreeRDP has a NULL Pointer Dereference in rdp_write_logon_info_v2() (CVE-2026-23948)
* freerdp: FreeRDP has a Heap-use-after-free in play_thread (CVE-2026-24684)
* freerdp: FreeRDP has a heap-use-after-free in urb_bulk_transfer_cb (CVE-2026-24681)
* freerdp: FreeRDP has a heap-use-after-free in ainput_send_input_event (CVE-2026-24683)
* freerdp: FreeRDP has a heap-buffer-overflow in urb_select_interface (CVE-2026-24679)
* freerdp: FreeRDP has a Heap-use-after-free in urb_select_interface (CVE-2026-24675)
* freerdp: FreeRDP: Arbitrary code execution via crafted Remote Desktop Protocol (RDP) server messages (CVE-2026-31806)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 RHEL freerdp package based on the guidance in RHSA-2026:6340.See Also
https://access.redhat.com/security/updates/classification/#important
https://bugzilla.redhat.com/show_bug.cgi?id=2429650
https://bugzilla.redhat.com/show_bug.cgi?id=2429652
https://bugzilla.redhat.com/show_bug.cgi?id=2429654
https://bugzilla.redhat.com/show_bug.cgi?id=2430881
https://bugzilla.redhat.com/show_bug.cgi?id=2438201
https://bugzilla.redhat.com/show_bug.cgi?id=2438202
https://bugzilla.redhat.com/show_bug.cgi?id=2438207
https://bugzilla.redhat.com/show_bug.cgi?id=2438208
https://bugzilla.redhat.com/show_bug.cgi?id=2438210
https://bugzilla.redhat.com/show_bug.cgi?id=2438216
https://bugzilla.redhat.com/show_bug.cgi?id=2438217
https://bugzilla.redhat.com/show_bug.cgi?id=2438221
https://bugzilla.redhat.com/show_bug.cgi?id=2447376
Plugin Details
Severity: Critical
ID: 304546
File Name: redhat-RHSA-2026-6340.nasl
Version: 1.1
Type: Local
Agent: unix
Family: Red Hat Local Security Checks
Published: 4/1/2026
Updated: 4/1/2026
Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.7
Vendor
Vendor Severity: Important
CVSS v2
Risk Factor: Critical
Base Score: 10
Temporal Score: 7.8
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2026-31806
CVSS v3
Risk Factor: Critical
Base Score: 9.8
Temporal Score: 8.8
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:P/RL:O/RC:C
CVSS v4
Risk Factor: Critical
Base Score: 9.3
Threat Score: 8.9
Threat Vector: CVSS:4.0/E:P
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Vulnerability Information
CPE: p-cpe:/a:redhat:enterprise_linux:freerdp, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:redhat:enterprise_linux:libwinpr, p-cpe:/a:redhat:enterprise_linux:libwinpr-devel, p-cpe:/a:redhat:enterprise_linux:freerdp-devel, p-cpe:/a:redhat:enterprise_linux:freerdp-libs
Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 4/1/2026
Vulnerability Publication Date: 1/14/2026
Reference Information
CVE: CVE-2026-22852, CVE-2026-22854, CVE-2026-22856, CVE-2026-23732, CVE-2026-23948, CVE-2026-24491, CVE-2026-24675, CVE-2026-24676, CVE-2026-24679, CVE-2026-24681, CVE-2026-24683, CVE-2026-24684, CVE-2026-31806