CVE-2020-15687: Missing access control restrictions in the Hypervisor component of the ACRN Project (v2.0 and v1.6.1) allow a

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HIGH 7.5REMOTEWATCHLISTMITIGATE

CVE-2020-15687 is a high-severity flaw (CVSS 7.5) affecting acrn. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Missing access control restrictions in the Hypervisor component of the ACRN Project (v2.0 and v1.6.1) allow a malicious entity, with root access in the Service VM userspace, to abuse the PCIe assign/de-assign Hypercalls via crafted ioctls and payloads. This attack results in a corrupt state and Denial of Service (DoS) for previously assigned PCIe devices to the Service VM at runtime.

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Published	2020-08-31
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: linuxfoundation

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-08-31 16:15 UTCPublished CVE record published
2026-06-17 02:57 UTCUpdated Record last modified

linuxfoundation acrn MITIGATE

Affected: 1.6.1 · 2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.6.1

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-15687?

acrn: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-15687 being exploited?

CVE-2020-15687 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-15687 affect?

CVE-2020-15687 affects acrn. Severity is high (CVSS 7.5). Missing access control restrictions in the Hypervisor component of the ACRN Project (v2.0 and v1.6.1) allow a malicious entity, with root access in the Service VM userspace, to abuse the PCIe assign/de-assign Hypercalls via crafted ioctls a

How urgent is CVE-2020-15687?

Priority 55/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Related CVEs

CVE-2021-36148 HIGH 7.8 UPGRADE An issue was discovered in ACRN before 2.5
CVE-2021-36147 HIGH 7.5 UPGRADE An issue was discovered in ACRN before 2.5
CVE-2021-36146 HIGH 7.5 UPGRADE ACRN before 2.5 has a devicemodel/hw/pci/xhci.c NULL Pointer Dereference for a trb pointer.
CVE-2021-36145 HIGH 7.5 UPGRADE The Device Model in ACRN through 2.5 has a devicemodel/core/mem.c use-after-free for a freed rb_entry.
CVE-2021-36144 HIGH 7.5 UPGRADE The polling timer handler in ACRN before 2.5 has a use-after-free for a freed virtio device, related to device

References

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