CVE-2026-89453

Summary

In the Linux kernel, the following vulnerability has been resolved:

iommu/amd: Put PCI device after handling PPR faults

iommu_call_iopf_notifier() looks up the requester with pci_get_domain_bus_and_slot(), which returns a PCI device with its reference count incremented.

Neither the successful iommu_report_device_fault() path nor the abort path drops that reference, so every handled PPR request leaks a PCI device reference.

This is the same ownership rule that was fixed for the old iommu_v2 ppr_notifier() path by commit 6cf0981c2233 ("iommu/amd: Fix pci device refcount leak in ppr_notifier()"), but iommu_call_iopf_notifier() was added later as a separate PPR/IOPF notifier path.

Drop the PCI device reference after handling the PPR entry.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux978d626b8f1a239acc635323d731c77eae54eb61 < 1de4443f85e4405af00153cdf8ba73ff12a65036affected
LinuxLinux978d626b8f1a239acc635323d731c77eae54eb61 < cfc5c1b2caa176dfd40b873a6ff07b11da34cc3eaffected
LinuxLinux978d626b8f1a239acc635323d731c77eae54eb61 < d1470e16c1977e6c94fadf6048deafaa4d150fecaffected
LinuxLinux978d626b8f1a239acc635323d731c77eae54eb61 < af3b69b16383fbc8fe5f61b5b0150d2e41ede71faffected
LinuxLinux6.10affected
LinuxLinux0 < 6.10unaffected
LinuxLinux6.12.109 <= 6.12.*unaffected
LinuxLinux6.18.50 <= 6.18.*unaffected
LinuxLinux7.2.4 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References