CVE-2026-57965 Spice-vdagent: integer overflow in udscs_write() leading to heap buffer overflow
A malicious SPICE host can trigger an integer overflow in spice-vdagent, causing a heap buffer overflow and denial of service for the virtual machine.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-57965?
CVE-2026-57965 is a medium-severity vulnerability in Redhat Enterprise Linux, published on 29 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-190
Which versions are affected by CVE-2026-57965?
It affects 2 products.
Products include Redhat Enterprise Linux, Spice-Space Spice-Vdagent.
How do I fix CVE-2026-57965?
Apply the vendor's patch.
Is CVE-2026-57965 being exploited?
There is no known exploitation of CVE-2026-57965 in the wild and no public exploit code.
Other vulnerabilities in Redhat Enterprise Linux
- CVE-2018-14667 Red Hat JBoss RichFaces Framework Expression Language Injection
- CVE-2021-20325 Missing fixes for CVE-2021-40438 and CVE-2021-26691 in the versions of httpd, as shipped in Red Hat Enterprise Linux 8.5.0, causes a securit
- CVE-2018-25011 Memory corruption in libwebp
- CVE-2018-25014 Other in libwebp
- CVE-2014-3585 Supply chain in redhat-upgrade-tool
Sources
Also known as CLSA-2026-1786717202, CLSA-2026-1788381510, DEBIAN-CVE-2026-57965, GHSA-54pp-f5wh-29jc, UBUNTU-CVE-2026-57965.