EUVD-2026-40049
GHSA-54pp-f5wh-29jc
Severity by source
AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H
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.
Primary rating from Vendor (redhat).
CVSS VectorVendor: redhat
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H
Lifecycle Timeline
2DescriptionCVE.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. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the SPICE host communicating with the target guest VM be either malicious by design or already compromised - this prerequisite is explicitly stated in the CVE description ('requires the SPICE host to be untrusted or compromised for exploitation'). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 5.1 (Medium) with vector AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H accurately reflects constrained real-world risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has compromised or otherwise controls a SPICE host crafts a malformed SPICE protocol message embedding a length or count value engineered to overflow during integer arithmetic in spice-vdagent's message parser. The overflow causes allocation of an undersized heap buffer, and the subsequent write of the full payload triggers a heap buffer overflow, crashing the spice-vdagent daemon and causing a Denial of Service for the affected guest VM. … |
| Remediation | Apply the Red Hat-issued errata update for the spice-vdagent package on affected RHEL releases (6, 7, 8, 9, 10) when published. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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