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TI-2021-20551 Aliases CVE-2021-45464GHSA-42pc-9g8v-prfm

kvmtool through 39181fc allows an out-of-bounds write, related to virtio/balloon.c and…

Priority MEDIUM 40CWE-787Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00378 32nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:kvmtool_project:kvmtool:-:*:*:*:*:*:*:*not specified by NVDVulnerableKvmtool Project
  • cpe:2.3:a:kvmtool_project:kvmtool:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Kvmtool Project

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-45464
  2. 2026-10-03 Alias added: GHSA-42pc-9g8v-prfm

References

Exploit 1

Patch 2

Other 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences