Skip to main content

spice-vdagent EUVDEUVD-2026-40049

| CVE-2026-57965 MEDIUM
Integer Overflow or Wraparound (CWE-190)
2026-06-29 redhat GHSA-54pp-f5wh-29jc
Buffer Overflow Denial Of Service Integer Overflow Red Hat Red Hat Enterprise Linux 10 Red Hat Enterprise Linux 6 Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 9 Suse Red Hat
5.1
CVSS 3.1 · Vendor: redhat
Share

Severity by source

Vendor (redhat) PRIMARY
5.1 MEDIUM
AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H
vuln.today AI
5.1 MEDIUM

AV:L because SPICE virtual channel is local to the VM boundary; PR:H because attacker must already control the SPICE host; C:N as no confidentiality impact is described.

3.1 AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H
4.0 AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
SUSE
7.8 HIGH
AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Red Hat
5.1 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jun 29, 2026 - 09:17 vuln.today
CVE Published
Jun 29, 2026 - 07:53 cve.org
MEDIUM 5.1

DescriptionCVE.org

A flaw was found in spice-vdagent. A malicious or compromised SPICE host can trigger an integer overflow by sending a specially crafted message. This vulnerability can lead to a heap buffer overflow, causing the spice-vdagent daemon to crash and resulting in a Denial of Service (DoS) for the virtual machine. This issue requires the SPICE host to be untrusted or compromised for exploitation.

AnalysisAI

Integer overflow in spice-vdagent's message parsing allows a malicious or compromised SPICE host to crash the guest VM's vdagent daemon by delivering a specially crafted message that triggers a downstream heap buffer overflow. Affected deployments span spice-vdagent as packaged in Red Hat Enterprise Linux 6 through 10, where the daemon runs inside guests handling host-to-guest SPICE protocol communications. No public exploit code or CISA KEV listing exists at time of analysis; exploitation is structurally constrained by the requirement that the attacking SPICE host itself be untrusted or already compromised prior to the attack.

Technical ContextAI

spice-vdagent is a userspace daemon that runs inside virtual machine guests and implements the SPICE (Simple Protocol for Independent Computing Environments) guest agent protocol, enabling clipboard sharing, display configuration, and file transfer between a SPICE host and its guests. Messages from the SPICE host are delivered through a virtual serial channel (e.g., virtio-serial) rather than a conventional network interface, which accounts for the AV:L (local) classification in the CVSS vector. The root cause is CWE-190 (Integer Overflow or Wraparound): a size or length field in an incoming host message can be crafted to overflow during arithmetic processing, causing a subsequent heap allocation to be undersized. When the oversized payload data is then written into the undersized buffer, a heap buffer overflow results. This is a classic integer-overflow-to-heap-overflow chain. Affected CPEs are cpe:2.3:a:red_hat:red_hat_enterprise_linux_6 through red_hat_enterprise_linux_10, indicating the spice-vdagent package across the full supported RHEL lifecycle.

RemediationAI

Apply the Red Hat-issued errata update for the spice-vdagent package on affected RHEL releases (6, 7, 8, 9, 10) when published. Monitor the Red Hat Security Advisory at https://access.redhat.com/security/cve/CVE-2026-57965 and Bugzilla entry https://bugzilla.redhat.com/show_bug.cgi?id=2493581 for patched package version confirmation, as exact fix versions are not yet specified in available intelligence. As a compensating control, ensure guest VMs are connected only to fully trusted SPICE hosts operated by the same administrative team - never attach production VMs to third-party or shared SPICE infrastructure. In multitenant or VDI environments, enforce strict administrative access controls on the SPICE server layer and audit who has the ability to craft or inject SPICE protocol messages. If SPICE guest agent functionality (clipboard, file transfer, display resizing) is not required for a given VM, stopping or disabling the spice-vdagent service entirely eliminates this attack surface with the trade-off of losing those guest integration features.

More in Red Hat Enterprise Linux 10

View all
CVE-2026-18663 MEDIUM
5.9 Aug 12

Heap corruption via double-free in 389-ds-base's LDAP control parsing allows an unauthenticated remote attacker to crash
CVE-2026-4631 CRITICAL POC
9.8 Apr 07

Remote code execution in Cockpit's web interface allows unauthenticated attackers to execute arbitrary commands on the h
CVE-2026-4480 CRITICAL POC
9.0 May 26

Remote code execution in Samba's printing subsystem allows remote attackers to inject arbitrary shell commands via craft
CVE-2026-18922 CRITICAL
9.8 Sep 07

Authentication bypass in 389 Directory Server (shipped as Red Hat Directory Server 11-13 and within RHEL 6-10) lets remo
CVE-2026-14544 CRITICAL
9.8 Jul 03

Remote code execution and privilege escalation in HPLIP (HP Linux Imaging and Printing) affects the hpcups print filter

CVE-2026-76578 CRITICAL
9.8 Sep 07

Unauthenticated privilege escalation in FreeIPA (Red Hat Identity Management) allows a remote attacker to gain genuine a
CVE-2026-5121 HIGH
7.5 Mar 30

Remote code execution in libarchive on 32-bit systems allows unauthenticated attackers to execute arbitrary code via spe
CVE-2026-28369 CRITICAL
9.1 Mar 27

HTTP request smuggling in Undertow (the embedded web server underpinning JBoss EAP, Red Hat Data Grid, and Apache Camel

CVE-2026-28368 CRITICAL
9.1 Mar 27

HTTP request smuggling in Red Hat Undertow allows remote unauthenticated attackers to bypass front-end security controls
CVE-2026-33845 CRITICAL
9.1 Apr 30

Out-of-bounds read in the GnuTLS DTLS handshake reassembly logic lets remote unauthenticated attackers trigger an intege
CVE-2026-28367 CRITICAL
9.1 Mar 27

HTTP request smuggling in Undertow allows remote unauthenticated attackers to send `\r\r\r` as a header block terminator
CVE-2026-16526 HIGH
8.8 Jul 30

Local privilege escalation in Performance Co-Pilot (PCP) on Red Hat Enterprise Linux 6 through 10 and OpenShift Containe

Same weakness CWE-190 – Integer Overflow or Wraparound

View all
CVE-2013-2729 CRITICAL POC
9.8
CVE-2015-8651 HIGH
8.8
CVE-2012-5054 HIGH POC
8.8
CVE-2014-0569 CRITICAL POC
9.3
CVE-2023-21716 CRITICAL POC
9.8
CVE-2017-3599 HIGH POC
7.5
CVE-2017-7529 HIGH
7.5
CVE-2016-1010 HIGH
8.8

Same technique Buffer Overflow

View all
CVE-2017-7269 CRITICAL POC
9.8
CVE-2015-5119 CRITICAL POC
9.8
CVE-2015-3113 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2020-0796 CRITICAL POC
10.0
CVE-2019-11043 CRITICAL POC
9.8
CVE-2009-0927 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8

Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server 16.0 Affected

Share

EUVD-2026-40049 vulnerability details – vuln.today
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy