CVE-2021-45464: kvmtool_project kvmtool Out-of-bounds Write
Vulnerability summary
CVE-2021-45464 is a high (CVSS 8.8) Out-of-bounds Write vulnerability in kvmtool_project kvmtool. EPSS estimates a 0.38% chance of exploitation in the next 30 days, higher than 31.8% of scored vulnerabilities. 1 public exploit is recorded.
Public exploit (reference, Date unknown)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 0 · Related 1Timeline
- 15-04-2023PublishedVulnerability first disclosed.
- 06-02-2025Last modifiedVulnerability information updated.
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.
CVSS metrics
3 scores · 3 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- NVDNIST8.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS trend
Probability
0.38%
Chance of exploitation in the next 30 days
Percentile
32%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.38% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundExploit Reference (kalmarunionen.dk)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Kvmtool_project1 product
- kvmtoolna
Ubuntu1 product
- kvmtool< 0.20151104-1ubuntu0.1~esm1 | < 0.20170904-1ubuntu0.18.04.1~esm1 | < 0.20170904-1ubuntu0.20.04.1~esm1 | < 0.20170904-1.1ubuntu0.1~esm2
2 vendors · 2 products
References
7 links- git.kernel.org/pub/…Patch