CVEvulnerability

CVE-2021-28692

7.1 HIGH Published 2021-06-30 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2021-06-30
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.1 HIGH — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CVSS 2.0 ([email protected])
5.6 MEDIUM — AV:L/AC:L/Au:N/C:P/I:N/A:C
Weaknesses
CWE-269

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.

Affected configurations

• xen xen (>= 3.2.0)

Related

Weakness · CWE (1)

  • CWE-269 Improper Privilege Management weakness

References