CVE-2026-57965: Spice-vdagent: integer overflow in udscs_write() leading to heap buffer overflow

Severity: medium (CVSS 5.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-29 · updated 2026-07-08
Weakness: CWE-190

Description

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.

Affected products

Red Hat Enterprise Linux: 6.0, 7.0, 8.0, 9.0, 10.0
Spice-Space Spice-Vdagent: all versions

References

https://access.redhat.com/security/cve/CVE-2026-57965
https://bugzilla.redhat.com/show_bug.cgi?id=2493581

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