TI-2021-12510 Aliases CVE-2021-32845 GHSA-hpc3-58qp-h295

Moby HyperKit uninitialized memory use vtrnd pci_vtrnd_notify

LOW 34CWE-908Published 2023-02-17 · Updated 2025-03-10

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0025 16th percentileScored 2026-11-07

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: Partial

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
moby	hyperkit	0.20210107 – 0.20210107	—	No fix listed	CNA

hyperkit Vendormoby Affected 0.20210107 – 0.20210107 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:mobyproject:hyperkit::::::::	up to 0.20210107	Vulnerable	Mobyproject

cpe:2.3:a:mobyproject:hyperkit:*:*:*:*:*:*:*:* Versions up to 0.20210107 Vulnerable ·Mobyproject

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-32845
2026-10-03 Alias added: GHSA-hpc3-58qp-h295

References

Patch 2

Advisory 1

https://securitylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/

TI-2026-14229 Tar extraction in moby/go-archive can write outside the destination directory via link following CVSS 4.0HIGH 7.1
TI-2021-12512 Moby HyperKit uninitialized memory use in virtio-sock pci_vtsock_proc_tx CVSS 3.1HIGH 7.1
TI-2024-27462 Moby authz zero length regression CVSS 3.1CRITICAL 10.0
TI-2024-15672 BuildKit interactive containers API does not validate entitlements check CVSS 3.1CRITICAL 9.8
TI-2024-15671 BuildKit possible host system access from mount stub cleaner CVSS 3.1CRITICAL 10.0
TI-2026-26365 Moby: AuthZ plugin bypass with oversized request body CVSS 3.1HIGH 8.8

See all 57 →

Sources

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