========================================================================== Ubuntu Security Notice USN-8172-1 April 13, 2026
kvmtool vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in kvmtool.
Software Description:
- kvmtool: Native Linux KVM tool
Details:
It was discovered that kvmtool did not properly manage memory under certain
circumstances. A malicious guest attacker could use this issue to cause
kvmtool to crash, leading to a denial of service, or possibly execute
arbitrary code on the host system. (CVE-2021-45464)
It was discovered that kvmtool incorrectly handled the 9p passthrough file
system. A malicious guest attacker could possibly use this issue to open
special files, escape the exported 9p tree, and execute arbitrary code on
the host system. (CVE-2023-2861)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 22.04 LTS
kvmtool 0.20170904-1.1ubuntu0.1~esm2
Available with Ubuntu Pro
Ubuntu 20.04 LTS
kvmtool 0.20170904-1ubuntu0.20.04.1~esm1
Available with Ubuntu Pro
Ubuntu 18.04 LTS
kvmtool 0.20170904-1ubuntu0.18.04.1~esm1
Available with Ubuntu Pro
Ubuntu 16.04 LTS
kvmtool 0.20151104-1ubuntu0.1~esm1
Available with Ubuntu Pro
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-8172-1
CVE-2021-45464, CVE-2023-2861
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