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CVE-2021-32845

HIGH
Published 2023-02-17T00:00:00.000Z
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CVSS Score

V3.1
7.7
/10
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.000
probability
of exploitation in the wild

There is a 0.0% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.060
Higher than 6.0% of all CVEs

Attack Vector Metrics

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
NONE
Integrity
HIGH
Availability
HIGH

Description

HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107 and prior of HyperKit, the implementation of `qnotify` at `pci_vtrnd_notify` fails to check the return value of `vq_getchain`. This leads to `struct iovec iov;` being uninitialized and used to read memory in `len = (int) read(sc->vrsc_fd, iov.iov_base, iov.iov_len);` when an attacker is able to make `vq_getchain` fail. This issue may lead to a guest crashing the host causing a denial of service and, under certain circumstance, memory corruption. This issue is fixed in commit 41272a980197917df8e58ff90642d14dec8fe948.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

moby

hyperkit

Affected Versions:

0.20210107

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed HIGH

GHSA-hpc3-58qp-h295

Advisory Details

HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107 and prior of HyperKit, the implementation of `qnotify` at `pci_vtrnd_notify` fails to check the return value of `vq_getchain`. This leads to `struct iovec iov;` being uninitialized and used to read memory in `len = (int) read(sc->vrsc_fd, iov.iov_base, iov.iov_len);` when an attacker is able to make `vq_getchain` fail. This issue may lead to a guest crashing the host causing a denial of service and, under certain circumstance, memory corruption. This issue is fixed in commit 41272a980197917df8e58ff90642d14dec8fe948.

CVSS Scoring

CVSS Score

7.5

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2021-32845
WEB https://github.com/moby/hyperkit/pull/313
WEB https://github.com/moby/hyperkit/commit/41272a980197917df8e58ff90642d14dec8fe948
ADVISORY https://securitylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit

Advisory provided by GitHub Security Advisory Database. Published: February 18, 2023, Modified: February 28, 2023

References

https://securitylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/
https://github.com/moby/hyperkit/pull/313
https://github.com/moby/hyperkit/commit/41272a980197917df8e58ff90642d14dec8fe948
Published: 2023-02-17T00:00:00.000Z
Last Modified: 2025-03-10T21:09:53.340Z
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