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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-23361

PCI: dwc: ep: Flush MSI-X write before unmapping its ATU entry

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: PCI: dwc: ep: Flush MSI-X write before unmapping its ATU entry Endpoint drivers use dw_pcie_ep_raise_msix_irq() to raise an MSI-X interrupt to the host using a writel(), which generates a PCI posted write transaction. There's no completion for posted writes, so the writel() may return before the PCI write completes. dw_pcie_ep_raise_msix_irq() also unmaps the outbound ATU entry used for the PCI write, so the write races with the unmap. If the PCI write loses the race with the ATU unmap, the write may corrupt host memory or cause IOMMU errors, e.g., these when running fio with a larger queue depth against nvmet-pci-epf: arm-smmu-v3 fc900000.iommu: 0x0000010000000010 arm-smmu-v3 fc900000.iommu: 0x0000020000000000 arm-smmu-v3 fc900000.iommu: 0x000000090000f040 arm-smmu-v3 fc900000.iommu: 0x0000000000000000 arm-smmu-v3 fc900000.iommu: event: F_TRANSLATION client: 0000:01:00.0 sid: 0x100 ssid: 0x0 iova: 0x90000f040 ipa: 0x0 arm-smmu-v3 fc900000.iommu: unpriv data write s1 "Input address caused fault" stag: 0x0 Flush the write by performing a readl() of the same address to ensure that the write has reached the destination before the ATU entry is unmapped. The same problem was solved for dw_pcie_ep_raise_msi_irq() in commit 8719c64e76bf ("PCI: dwc: ep: Cache MSI outbound iATU mapping"), but there it was solved by dedicating an outbound iATU only for MSI. We can't do the same for MSI-X because each vector can have a different msg_addr and the msg_addr may be changed while the vector is masked. [bhelgaas: commit log]

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • beb4641a787df79a1423a8789d185b6b78fcbfea to < 1d35fc94cd723ae27371a31f404685a24b097d71affected
  • beb4641a787df79a1423a8789d185b6b78fcbfea to < 5e2fc90018635fc982d39f8c11cd3b368fdaf3b7affected
  • beb4641a787df79a1423a8789d185b6b78fcbfea to < a7afb8f810c04845fdfc58c57d9cf0cc5f23ced0affected
  • beb4641a787df79a1423a8789d185b6b78fcbfea to < 6f60a783860c77b309f7d81003b6a0c73feca49eaffected
  • beb4641a787df79a1423a8789d185b6b78fcbfea to < eaa6a56801ddd2d9b4980f19e7fe002b00994804affected
  • beb4641a787df79a1423a8789d185b6b78fcbfea to < c22533c66ccae10511ad6a7afc34bb26c47577e3affected

Linux Linux

Default version status: affected

  • 4.19affected
  • 0 to < 4.19unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.77 to ≤ 6.12.*unaffected
  • 6.18.17 to ≤ 6.18.*unaffected
  • 6.19.7 to ≤ 6.19.*unaffected
  • 7.0 to ≤ *unaffected

References