Vulnerability Description
inappropriate x86 IOMMU timeout detection / handling IOMMUs process commands issued to them in parallel with the operation of the CPU(s) issuing such commands. In the current implementation in Xen, asynchronous notification of the completion of such commands is not used. Instead, the issuing CPU spin-waits for the completion of the most recently issued command(s). Some of these waiting loops try to apply a timeout to fail overly-slow commands. The course of action upon a perceived timeout actually being detected is inappropriate: - on Intel hardware guests which did not originally cause the timeout may be marked as crashed, - on AMD hardware higher layer callers would not be notified of the issue, making them continue as if the IOMMU operation succeeded.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Xen | Xen | >= 3.2.0 |
Related Weaknesses (CWE)
References
- https://security.gentoo.org/glsa/202107-30MitigationThird Party Advisory
- https://xenbits.xenproject.org/xsa/advisory-373.txtVendor Advisory
- https://security.gentoo.org/glsa/202107-30MitigationThird Party Advisory
- https://xenbits.xenproject.org/xsa/advisory-373.txtVendor Advisory
FAQ
What is CVE-2021-28692?
CVE-2021-28692 is a vulnerability with a CVSS score of 7.1 (HIGH). inappropriate x86 IOMMU timeout detection / handling IOMMUs process commands issued to them in parallel with the operation of the CPU(s) issuing such commands. In the current implementation in Xen, as...
How severe is CVE-2021-28692?
CVE-2021-28692 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-28692?
Check the references section above for vendor advisories and patch information. Affected products include: Xen Xen.