CVE-2021-28690

Name: CVE-2021-28690
Creator: NVD / NIST
Published: 2021-06-29T12:15:08.513+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.02%

Last modified Jun 17, 2026

CVE-2021-28690 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. x86: TSX Async Abort protections not restored after S3 This issue relates to the TSX Async Abort speculative security vulnerability. Please see https://xenbits.xen.org/xsa/advisory-305.html for details. EPSS estimates a 1.02% chance of exploitation in the next 30 days.

Description

x86: TSX Async Abort protections not restored after S3 This issue relates to the TSX Async Abort speculative security vulnerability. Please see https://xenbits.xen.org/xsa/advisory-305.html for details. Mitigating TAA by disabling TSX (the default and preferred option) requires selecting a non-default setting in MSR_TSX_CTRL. This setting isn't restored after S3 suspend.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

1.02%

59.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions	Update
Xen	Xen	>= 4.12, <= 4.15.0	—
Xen	Xen	4.15.0	Rc1

References

https://security.gentoo.org/glsa/202107-30Third Party Advisory
https://xenbits.xenproject.org/xsa/advisory-377.txtPatch, Vendor Advisory
https://security.gentoo.org/glsa/202107-30Third Party Advisory
https://xenbits.xenproject.org/xsa/advisory-377.txtPatch, Vendor Advisory

Timeline

Published: Jun 29, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-28690?

How severe is CVE-2021-28690?

CVE-2021-28690 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.02% probability of exploitation in the next 30 days.

How do I fix CVE-2021-28690?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-28690?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST