# CVE-2021-45464: kvmtool: kvmtool through 39181fc allows an out-of-bounds write, related to virtio/balloon.c and virtio/pci.c

CVE-2021-45464 is fixed in kvmtool on 1 platform, first by kvmtool 0.20170904-1ubuntu0.18.04.1~esm1, released June 29, 2023. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-45464
- Priority: High
- CVSS: n/a (High)
- EPSS: 0.0038
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 15, 2023

## Description

kvmtool through 39181fc allows an out-of-bounds write, related to virtio/balloon.c and virtio/pci.c. This allows a guest OS user to execute arbitrary code on the host machine.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | kvmtool Ubuntu 18.04.6 LTS (bionic) | 0.20170904-1ubuntu0.18.04.1~esm1 | [kvmtool 0.20170904-1ubuntu0.18.04.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-kvmtool-0.20170904-1ubuntu0.18.04.1-esm1.md) | Jun 29, 2023 |
| Linux | kvmtool Ubuntu 20.04 LTS (focal) | 0.20170904-1ubuntu0.20.04.1~esm1 | [kvmtool 0.20170904-1ubuntu0.20.04.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-kvmtool-0.20170904-1ubuntu0.20.04.1-esm1.md) | Jun 29, 2023 |
| Linux | kvmtool Ubuntu 22.04.1 LTS (jammy) | 0.20170904-1.1ubuntu0.1~esm2 | [kvmtool 0.20170904-1.1ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-kvmtool-0.20170904-1.1ubuntu0.1-esm2.md) | Jun 29, 2023 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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