In the Linux kernel, the following vulnerability has been resolved:
PCI/MSI: Handle lack of irqdomain gracefully
Alexandre observed a warning emitted from pci_msi_setup_msi_irqs() on a RISCV platform which does not provide PCI/MSI support:
WARNING: CPU: 1 PID: 1 at drivers/pci/msi/msi.h:121 pci_msi_setup_msi_irqs+0x2c/0x32 __pci_enable_msix_range+0x30c/0x596 pci_msi_setup_msi_irqs+0x2c/0x32 pci_alloc_irq_vectors_affinity+0xb8/0xe2
RISCV uses hierarchical interrupt domains and correctly does not implement the legacy fallback. The warning triggers from the legacy fallback stub.
That warning is bogus as the PCI/MSI layer knows whether a PCI/MSI parent domain is associated with the device or not. There is a check for MSI-X, which has a legacy assumption. But that legacy fallback assumption is only valid when legacy support is enabled, but otherwise the check should simply return -ENOTSUPP.
Loongarch tripped over the same problem and blindly enabled legacy support without implementing the legacy fallbacks. There are weak implementations which return an error, so the problem was papered over.
Correct pci_msi_domain_supports() to evaluate the legacy mode and add the missing supported check into the MSI enable path to complete it.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 27, 2026 | Jul 27, 2026 |
| Oracle_linux | — | Upgrade kernel-uek | Apr 15, 2025 | Jan 6, 2025 |
| Redhat_linux | — | No solution existsUpgrade kernelUpgrade kernel-rt | May 15, 2025 | Jan 6, 2025 |
| Ubuntu | — | Upgrade linux-image-azureUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-raspi-realtimeUpgrade linux-image-6.8.1-1022-realtimeUpgrade linux-image-6.8.0-1028-nvidiaUpgrade linux-image-ibmUpgrade linux-image-6.8.0-60-lowlatencyUpgrade linux-image-lowlatency-64kUpgrade linux-image-6.11.0-21-generic-64kUpgrade linux-image-azure-lts-24.04Upgrade linux-image-6.11.0-1011-gcpUpgrade linux-image-oem-24.04aUpgrade linux-image-6.11.0-1013-oracleUpgrade linux-image-azure-fdeUpgrade linux-image-6.8.0-1028-nvidia-64kUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-genericUpgrade linux-image-realtime-hwe-24.04Upgrade linux-image-gkeopUpgrade linux-image-lowlatencyUpgrade linux-image-6.11.0-1012-azureUpgrade linux-image-generic-64kUpgrade linux-image-oem-24.04Upgrade linux-image-oem-22.04cUpgrade linux-image-azure-nvidiaUpgrade linux-image-nvidiaUpgrade linux-image-oracle-lts-24.04Upgrade linux-image-gcp-64kUpgrade linux-image-6.11.0-1007-realtimeUpgrade linux-image-oem-22.04dUpgrade linux-image-oem-22.04aUpgrade linux-image-6.8.0-1026-oracleUpgrade linux-image-ibm-classicUpgrade linux-image-generic-hwe-22.04Upgrade linux-image-raspiUpgrade linux-image-6.11.0-1013-oracle-64kUpgrade linux-image-oem-22.04Upgrade linux-image-6.8.0-60-genericUpgrade linux-image-6.8.0-1030-gcpUpgrade linux-image-6.8.0-1016-azure-nvidiaUpgrade linux-image-gcpUpgrade linux-image-oracle-64kUpgrade linux-image-6.11.0-1011-lowlatencyUpgrade linux-image-nvidia-6.8Upgrade linux-image-oem-22.04bUpgrade linux-image-6.8.0-1012-gkeopUpgrade linux-image-aws-lts-24.04Upgrade linux-image-nvidia-64kUpgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-virtual-hwe-22.04Upgrade linux-image-6.8.0-1029-awsUpgrade linux-image-generic-lpaeUpgrade linux-image-6.11.0-1012-azure-fdeUpgrade linux-image-6.8.0-60-generic-64kUpgrade linux-image-6.8.0-60-lowlatency-64kUpgrade linux-image-6.8.0-1029-azureUpgrade linux-image-kvmUpgrade linux-image-lowlatency-hwe-24.04Upgrade linux-image-nvidia-lowlatencyUpgrade linux-image-gkeUpgrade linux-image-6.8.0-1028-oemUpgrade linux-image-6.11.0-1017-oemUpgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-6.8.0-1028-raspiUpgrade linux-image-realtimeUpgrade linux-image-6.11.0-1010-raspiUpgrade linux-image-6.11.0-1011-gcp-64kUpgrade linux-image-6.8.0-2023-raspi-realtimeUpgrade linux-image-oracleUpgrade linux-image-6.8.0-1029-azure-fdeUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-awsUpgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-gcp-lts-24.04Upgrade linux-image-6.11.0-21-genericUpgrade linux-image-6.8.0-1028-nvidia-lowlatencyUpgrade linux-image-oem-24.04bUpgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-azure-fde-lts-24.04Upgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-6.8.0-1026-ibmUpgrade linux-image-6.8.0-1028-nvidia-lowlatency-64kUpgrade linux-image-virtualUpgrade linux-image-6.8.0-1025-gkeUpgrade linux-image-gkeop-6.8Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-lowlatency-64k-hwe-24.04Upgrade linux-image-6.8.0-1026-oracle-64kUpgrade linux-image-6.8.0-1030-gcp-64kUpgrade linux-image-6.11.0-1011-awsUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-nvidia-64k-6.8Upgrade linux-image-6.11.0-1011-lowlatency-64k | Mar 28, 2025 | Jan 6, 2025 |
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