PCI: dwc: ep: Flush cached MSI write before unmapping the iATU

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90332
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:31 UTC
Updated2026-09-18 18:17:54 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: PCI: dwc: ep: Flush cached MSI write before unmapping the iATU The MSI-X path already flushes any posted MSI-X write before tearing down its iATU mapping. That was added by commit c22533c66cca ("PCI: dwc: ep: Flush MSI-X write before unmapping its ATU entry") to make sure the write reaches the Root Complex before the outbound window that translates it disappears. The MSI path has the same problem but no equivalent flush. When the Endpoint driver caches an MSI target address and later observes that the Root Complex has changed it, dw_pcie_ep_raise_msi_irq() unmaps the existing iATU entry and reprograms it for the new address. Between the last MSI writel() and the unmap there may still be a posted write sitting in the fabric, and unmapping the iATU entry can drop or misroute that write. Fix this by reading back from the mapped MSI window before the unmap. The readback drains any posted MSI writes through the same iATU entry that mapped them, which is the same logic the MSI-X path uses. [mani: commit log]

Risk And Classification

Primary CVSS: v3.1 8.2 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.002100000 probability, percentile 0.115780000 (date 2026-09-18)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.2HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H
3.1CNADECLARED8.2HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 468711a40d5dfc01bf0a24c1981246a2c93ac405 914704c7b318bdaa42dce4e55f6c492190fee3b5 git Not specified
CNA Linux Linux affected 468711a40d5dfc01bf0a24c1981246a2c93ac405 1b01d725d8b42450b86a857bab3c46856c740166 git Not specified
CNA Linux Linux affected cc83cd7b7d73d42ee64c7fc08ce679957df0f315 git Not specified
CNA Linux Linux affected 6.19.7 6.20 semver Not specified
CNA Linux Linux affected 7.0 Not specified
CNA Linux Linux unaffected 7.0 semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1b01d725d8b42450b86a857bab3c46856c740166 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/914704c7b318bdaa42dce4e55f6c492190fee3b5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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