USN-8723-1: SPICE vdagent vulnerabilities

Publication date

3 September 2026

Overview

Several security issues were fixed in SPICE vdagent.


Packages

Details

It was discovered that SPICE vdagent had an integer overflow in the buffer
size calculation used when writing to the daemon socket. A malicious or
compromised SPICE host could possibly use this issue to cause SPICE vdagent
to crash, resulting in a denial of service. (CVE-2026-57965)

It was discovered that SPICE vdagent did not properly sanitize filenames
provided by the SPICE host during file transfers. A malicious or
compromised SPICE host could possibly use this issue to write arbitrary
files to any location on the guest operating system with the privileges of
the spice-vdagent process. (CVE-2026-57966)

It was discovered that SPICE vdagent had an integer overflow in the buffer
size calculation used when writing to the daemon socket. A malicious or
compromised SPICE host could possibly use this issue to cause SPICE vdagent
to crash, resulting in a denial of service. (CVE-2026-57965)

It was discovered that SPICE vdagent did not properly sanitize filenames
provided by the SPICE host during file transfers. A malicious or
compromised SPICE host could possibly use this issue to write arbitrary
files to any location on the guest operating system with the privileges of
the spice-vdagent process. (CVE-2026-57966)

Update instructions

After a standard system update you need to restart spice-vdagent to make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
26.04 LTS resolute spice-vdagent –  0.23.0-1ubuntu0.1
24.04 LTS noble spice-vdagent –  0.22.1-4ubuntu0.1
22.04 LTS jammy spice-vdagent –  0.22.1-1ubuntu0.1

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