CVE-2026-20763: Incorrect calculation for some Intel(R) TDX Guest software before version 0.3.1 within Ring 3: User Applicatio

Q: How do I fix CVE-2026-20763?

trust domain extensions guest: upgrade to 0.3.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-20763 being exploited?

CVE-2026-20763 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-2026-20763 affect?

CVE-2026-20763 affects trust domain extensions guest. Severity is medium (CVSS 4.2). Incorrect calculation for some Intel(R) TDX Guest software before version 0.3.1 within Ring 3: User Applications may allow an escalation of privilege. System software adversary with a privileged user combined with a low complexity attack ma

Q: How urgent is CVE-2026-20763?

Priority 16/100. No elevated risk signals yet.

Routine

MEDIUM 4.2UPGRADE

CVE-2026-20763 is a medium-severity flaw (CVSS 4.2) affecting trust domain extensions guest. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Incorrect calculation for some Intel(R) TDX Guest software before version 0.3.1 within Ring 3: User Applications may allow an escalation of privilege. System software adversary with a privileged user combined with a low complexity attack may enable escalation of privilege. This result may potentially occur via local access when attack requirements are not present without special internal knowledge and requires no user interaction. The potential v

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.2 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.1% (top 96%)
CISA exploited list	No
Weakness	CWE-682
Published	2026-08-11
Last modified	2026-08-18

Publisher (CNA): Intel Corporation · Vendor: intel

Last updated 2026-08-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-11 17:17 UTCPublished CVE record published
2026-08-18 15:48 UTCUpdated Record last modified

intel trust domain extensions guest UPGRADE

Affected: < 0.3.1

Fixed in: 0.3.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy trust-domain-extensions-guest || rpm -q trust-domain-extensions-guest || trust-domain-extensions-guest --version

2. UPGRADE to 0.3.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade trust-domain-extensions-guest

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade trust-domain-extensions-guest

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2026-20763?

trust domain extensions guest: upgrade to 0.3.1. Exact commands for each OS are on this page.

Is CVE-2026-20763 being exploited?

CVE-2026-20763 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-2026-20763 affect?

CVE-2026-20763 affects trust domain extensions guest. Severity is medium (CVSS 4.2). Incorrect calculation for some Intel(R) TDX Guest software before version 0.3.1 within Ring 3: User Applications may allow an escalation of privilege. System software adversary with a privileged user combined with a low complexity attack ma

How urgent is CVE-2026-20763?

Priority 16/100. No elevated risk signals yet.

Software pages

Intel vulnerabilities

Related CVEs

CVE-2026-20765 MEDIUM 4.2 UPGRADE Incorrect comparison for some Intel(R) TDX Guest software before version 0.3.1 within Ring 3: User Application

References

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