CVE-2021-46918: dmaengine: idxd: clear MSIX permission entry on shutdown

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-02-27 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: clear MSIX permission entry on shutdown Add disabling/clearing of MSIX permission entries on device shutdown to mirror the enabling of the MSIX entries on probe. Current code left the MSIX enabled and the pasid entries still programmed at device shutdown.

Affected products

Linux kernel: from 5.11.0 before 5.11.16 — fixed in 5.11.16

How to fix

Upgrade to a fixed version: Linux kernel 5.11.16. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/6df0e6c57dfc064af330071f372f11aa8c584997
https://git.kernel.org/stable/c/c84b8982d7aa9b4717dc36a1c6cbc93ee153b500
https://git.kernel.org/stable/c/6df0e6c57dfc064af330071f372f11aa8c584997
https://git.kernel.org/stable/c/c84b8982d7aa9b4717dc36a1c6cbc93ee153b500

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