CVE-2021-41612: An issue was discovered in the ALU unit of the OpenRISC mor1kx processor

Q: How do I fix CVE-2021-41612?

mor1kx firmware: upgrade to 5.1. Exact commands for each OS are on this page.

Q: Is CVE-2021-41612 being exploited?

CVE-2021-41612 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-41612 affect?

CVE-2021-41612 affects mor1kx firmware. Severity is high (CVSS 8.8). An issue was discovered in the ALU unit of the OpenRISC mor1kx processor. The carry flag is not being updated correctly for the subtract instruction, which results in an incorrect value of the carry flag. Any software that relies on this fl

Q: How urgent is CVE-2021-41612?

Priority 52/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2021-41612 is a high-severity flaw (CVSS 8.8) affecting mor1kx firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in the ALU unit of the OpenRISC mor1kx processor. The carry flag is not being updated correctly for the subtract instruction, which results in an incorrect value of the carry flag. Any software that relies on this flag may experience corruption in execution.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.1% (top 33%)
CISA exploited list	No
Published	2023-04-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: openrisc

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

Am I affected?

Timeline

2023-04-18 12:15 UTCPublished CVE record published
2026-06-17 04:08 UTCUpdated Record last modified

openrisc mor1kx firmware UPGRADE

Affected: < 5.1

Fixed in: 5.1

Safe to downgrade to: no unaffected older release

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-2021-41612?

mor1kx firmware: upgrade to 5.1. Exact commands for each OS are on this page.

Is CVE-2021-41612 being exploited?

CVE-2021-41612 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-2021-41612 affect?

CVE-2021-41612 affects mor1kx firmware. Severity is high (CVSS 8.8). An issue was discovered in the ALU unit of the OpenRISC mor1kx processor. The carry flag is not being updated correctly for the subtract instruction, which results in an incorrect value of the carry flag. Any software that relies on this fl

How urgent is CVE-2021-41612?

Priority 52/100. High severity; Public exploit reference

Related CVEs

CVE-2021-41614 HIGH 7.8 MITIGATE An issue was discovered in the controller unit of the OpenRISC mor1kx processor
CVE-2021-41613 MEDIUM 4.3 UPGRADE An issue was discovered in the controller unit of the OpenRISC mor1kx processor

References

← Back to latest CVEs