CVE-2021-45464 json
kvmtool through 39181fc allows an out-of-bounds write, related to virtio/balloon.c and virtio/pci.c.
published 2023-04-15 3 y ago modified 2026-06-17 4 mo ago also EUVD-2021-32230
- cvss
- 8.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 32%
- public exploits
- 0
- none known
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.
Patch / fix
- kvmtool Ubuntu Pro 16.04 LTS 0.20151104-1ubuntu0.1~esm1
- kvmtool Ubuntu Pro 18.04 LTS 0.20170904-1ubuntu0.18.04.1~esm1
- kvmtool Ubuntu Pro 20.04 LTS 0.20170904-1ubuntu0.20.04.1~esm1
- kvmtool Ubuntu Pro 22.04 LTS 0.20170904-1.1ubuntu0.1~esm2
ubuntu advisories UBUNTU-CVE-2021-45464
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 21 mo ago
Exploit prediction
0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- kalmarunionen.dk https://www.kalmarunionen.dk/writeups/2021/hxp-2021/lkvm/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 8.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| NVD | 3.1 | 8.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
Classification
- Weakness
-
- CWE-787 Out-of-bounds Write
References
-
git.kernel.org
/pub/scm/linux/kernel/git/will/kvmtool.git/commit/?id=39181fc6429f4e9e71473284940e35857b42772a
patch
-
git.kernel.org
/pub/scm/linux/kernel/git/will/kvmtool.git/log/
patch
-
kalmarunionen.dk
/writeups/2021/hxp-2021/lkvm/
exploit, third-party-advisory
-
cdn.discordapp.com
/attachments/921419715170164776/921882173517230100/exploit.c
broken-link
Sources
- CVE List CVE-2021-45464
- NVD CVE-2021-45464
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.