CVE-2021-36710: ToaruOS 1.99.2 is affected by incorrect access control via the kernel

This month

HIGH 8.8MITIGATE

CVE-2021-36710 is a high-severity flaw (CVSS 8.8) affecting toaruos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ToaruOS 1.99.2 is affected by incorrect access control via the kernel. Improper MMU management and having a low GDT address allows it to be mapped in userland. A call gate can then be written to escalate to CPL 0.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	8.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 71%)
CISA exploited list	No
Weakness	CWE-668
Published	2022-06-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: toaruos

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

Am I affected?

Timeline

2022-06-08 15:15 UTCPublished CVE record published
2026-06-17 03:59 UTCUpdated Record last modified

toaruos toaruos MITIGATE

Affected: 1.99.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.99.2

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-2021-36710?

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

Is CVE-2021-36710 being exploited?

CVE-2021-36710 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-2021-36710 affect?

CVE-2021-36710 affects toaruos. Severity is high (CVSS 8.8). ToaruOS 1.99.2 is affected by incorrect access control via the kernel. Improper MMU management and having a low GDT address allows it to be mapped in userland. A call gate can then be written to escalate to CPL 0.

How urgent is CVE-2021-36710?

Priority 43/100. High severity; Public exploit reference

Related CVEs

CVE-2022-38934 LOW 3.3 MITIGATE readelf in ToaruOS 2.0.1 has some arbitrary address read vulnerabilities when parsing a crafted ELF file.
CVE-2022-38932 HIGH 7.8 MITIGATE readelf in ToaruOS 2.0.1 has a global overflow allowing RCE when parsing a crafted ELF file.

References

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