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Ubuntu 22.04 LTS kvmtool Severe DoS RCE Security Flaw USN-8172-1

Several security issues were fixed in kvmtool.. ========================================================================== 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 . Several security issues in kvmtool for Ubuntu were resolved, highlighting critical fixes for different LTS releases..Ubuntu kvmtool security issues, kvmtool denial of service vulnerabilities, kvmtool remote code execution. . Severity: Critical. LinuxSecurity.com Team

Apr 13, 2026 •Critical Ubuntu