VDB-226141 · CVE-2021-45464 · GCVE-0-2021-45464

kvmtool up to 39181fc virtio/balloon.c out-of-bounds write

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.9	$0-$5k	0.00

Summaryinfo

A vulnerability classified as critical has been found in kvmtool up to 39181fc. This vulnerability affects unknown code of the file virtio/balloon.c. This manipulation causes out-of-bounds write. This vulnerability is handled as CVE-2021-45464. Additionally, an exploit exists. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability was found in kvmtool up to 39181fc. It has been declared as critical. Affected by this vulnerability is some unknown processing of the file virtio/balloon.c. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was released 04/16/2023. The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2021-45464 since 12/23/2021. Technical details and also a public exploit are known.

It is possible to download the exploit at cdn.discordapp.com. It is declared as proof-of-concept.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org.

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Productinfo

Name

kvmtool

Version

39181fc

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.1
VulDB Meta Temp Score: 6.9

VulDB Base Score: 5.5
VulDB Temp Score: 5.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Programming Language: 🔍
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: git.kernel.org

Timelineinfo

12/23/2021 🔍
04/16/2023 +478 days 🔍
04/16/2023 +0 days 🔍
02/06/2025 +662 days 🔍

Sourcesinfo

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2021-45464 (🔍)
GCVE (CVE): GCVE-0-2021-45464
GCVE (VulDB): GCVE-100-226141
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 04/16/2023 08:00
Updated: 02/06/2025 18:53
Changes: 04/16/2023 08:00 (42), 02/06/2025 18:53 (26)
Complete: 🔍
Cache ID: 216::103