CVE-2026-23361 - Vulnerability Details

Vendors	Products
Linux	Linux Kernel

Link	Providers
https://git.kernel.org/stable/c/6f60a783860c77b309f7d81003b6a0c73feca49e
https://git.kernel.org/stable/c/a7afb8f810c04845fdfc58c57d9cf0cc5f23ced0
https://git.kernel.org/stable/c/c22533c66ccae10511ad6a7afc34bb26c47577e3
https://git.kernel.org/stable/c/eaa6a56801ddd2d9b4980f19e7fe002b00994804

Type	Values Removed	Values Added
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]
Title		PCI: dwc: ep: Flush MSI-X write before unmapping its ATU entry
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/6f60a783860c77b309f7d81003b6a0c73feca49e https://git.kernel.org/stable/c/a7afb8f810c04845fdfc58c57d9cf0cc5f23ced0 https://git.kernel.org/stable/c/c22533c66ccae10511ad6a7afc34bb26c47577e3 https://git.kernel.org/stable/c/eaa6a56801ddd2d9b4980f19e7fe002b00994804

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-23361", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:46.001Z", "datePublished": "2026-03-25T10:27:44.750Z", "dateUpdated": "2026-03-25T10:27:44.750Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-03-25T10:27:44.750Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: dwc: ep: Flush MSI-X write before unmapping its ATU entry\n\nEndpoint drivers use dw_pcie_ep_raise_msix_irq() to raise an MSI-X\ninterrupt to the host using a writel(), which generates a PCI posted write\ntransaction. There's no completion for posted writes, so the writel() may\nreturn before the PCI write completes. dw_pcie_ep_raise_msix_irq() also\nunmaps the outbound ATU entry used for the PCI write, so the write races\nwith the unmap.\n\nIf the PCI write loses the race with the ATU unmap, the write may corrupt\nhost memory or cause IOMMU errors, e.g., these when running fio with a\nlarger queue depth against nvmet-pci-epf:\n\n arm-smmu-v3 fc900000.iommu: 0x0000010000000010\n arm-smmu-v3 fc900000.iommu: 0x0000020000000000\n arm-smmu-v3 fc900000.iommu: 0x000000090000f040\n arm-smmu-v3 fc900000.iommu: 0x0000000000000000\n arm-smmu-v3 fc900000.iommu: event: F_TRANSLATION client: 0000:01:00.0 sid: 0x100 ssid: 0x0 iova: 0x90000f040 ipa: 0x0\n arm-smmu-v3 fc900000.iommu: unpriv data write s1 \"Input address caused fault\" stag: 0x0\n\nFlush the write by performing a readl() of the same address to ensure that\nthe write has reached the destination before the ATU entry is unmapped.\n\nThe same problem was solved for dw_pcie_ep_raise_msi_irq() in commit\n8719c64e76bf (\"PCI: dwc: ep: Cache MSI outbound iATU mapping\"), but there\nit was solved by dedicating an outbound iATU only for MSI. We can't do the\nsame for MSI-X because each vector can have a different msg_addr and the\nmsg_addr may be changed while the vector is masked.\n\n[bhelgaas: commit log]"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/pci/controller/dwc/pcie-designware-ep.c"], "versions": [{"version": "beb4641a787df79a1423a8789d185b6b78fcbfea", "lessThan": "a7afb8f810c04845fdfc58c57d9cf0cc5f23ced0", "status": "affected", "versionType": "git"}, {"version": "beb4641a787df79a1423a8789d185b6b78fcbfea", "lessThan": "6f60a783860c77b309f7d81003b6a0c73feca49e", "status": "affected", "versionType": "git"}, {"version": "beb4641a787df79a1423a8789d185b6b78fcbfea", "lessThan": "eaa6a56801ddd2d9b4980f19e7fe002b00994804", "status": "affected", "versionType": "git"}, {"version": "beb4641a787df79a1423a8789d185b6b78fcbfea", "lessThan": "c22533c66ccae10511ad6a7afc34bb26c47577e3", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/pci/controller/dwc/pcie-designware-ep.c"], "versions": [{"version": "4.19", "status": "affected"}, {"version": "0", "lessThan": "4.19", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.77", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.17", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.7", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0-rc2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.12.77"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.18.17"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.19.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "7.0-rc2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/a7afb8f810c04845fdfc58c57d9cf0cc5f23ced0"}, {"url": "https://git.kernel.org/stable/c/6f60a783860c77b309f7d81003b6a0c73feca49e"}, {"url": "https://git.kernel.org/stable/c/eaa6a56801ddd2d9b4980f19e7fe002b00994804"}, {"url": "https://git.kernel.org/stable/c/c22533c66ccae10511ad6a7afc34bb26c47577e3"}], "title": "PCI: dwc: ep: Flush MSI-X write before unmapping its ATU entry", "x_generator": {"engine": "bippy-1.2.0"}}}}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: dwc: ep: Flush MSI-X write before unmapping its ATU entry\n\nEndpoint drivers use dw_pcie_ep_raise_msix_irq() to raise an MSI-X\ninterrupt to the host using a writel(), which generates a PCI posted write\ntransaction. There's no completion for posted writes, so the writel() may\nreturn before the PCI write completes. dw_pcie_ep_raise_msix_irq() also\nunmaps the outbound ATU entry used for the PCI write, so the write races\nwith the unmap.\n\nIf the PCI write loses the race with the ATU unmap, the write may corrupt\nhost memory or cause IOMMU errors, e.g., these when running fio with a\nlarger queue depth against nvmet-pci-epf:\n\n arm-smmu-v3 fc900000.iommu: 0x0000010000000010\n arm-smmu-v3 fc900000.iommu: 0x0000020000000000\n arm-smmu-v3 fc900000.iommu: 0x000000090000f040\n arm-smmu-v3 fc900000.iommu: 0x0000000000000000\n arm-smmu-v3 fc900000.iommu: event: F_TRANSLATION client: 0000:01:00.0 sid: 0x100 ssid: 0x0 iova: 0x90000f040 ipa: 0x0\n arm-smmu-v3 fc900000.iommu: unpriv data write s1 \"Input address caused fault\" stag: 0x0\n\nFlush the write by performing a readl() of the same address to ensure that\nthe write has reached the destination before the ATU entry is unmapped.\n\nThe same problem was solved for dw_pcie_ep_raise_msi_irq() in commit\n8719c64e76bf (\"PCI: dwc: ep: Cache MSI outbound iATU mapping\"), but there\nit was solved by dedicating an outbound iATU only for MSI. We can't do the\nsame for MSI-X because each vector can have a different msg_addr and the\nmsg_addr may be changed while the vector is masked.\n\n[bhelgaas: commit log]"}], "id": "CVE-2026-23361", "lastModified": "2026-03-25T11:16:35.060", "metrics": {}, "published": "2026-03-25T11:16:35.060", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6f60a783860c77b309f7d81003b6a0c73feca49e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a7afb8f810c04845fdfc58c57d9cf0cc5f23ced0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c22533c66ccae10511ad6a7afc34bb26c47577e3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/eaa6a56801ddd2d9b4980f19e7fe002b00994804"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

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