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spice-vdagent CVE-2026-57965

| EUVDEUVD-2026-40049 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
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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.

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Same weakness CWE-190 – Integer Overflow or Wraparound

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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

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CVE-2026-57965 vulnerability details – vuln.today
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