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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-43130

iommu/vt-d: Flush dev-IOTLB only when PCIe device is accessible in scalable mode

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Flush dev-IOTLB only when PCIe device is accessible in scalable mode Commit 4fc82cd907ac ("iommu/vt-d: Don't issue ATS Invalidation request when device is disconnected") relies on pci_dev_is_disconnected() to skip ATS invalidation for safely-removed devices, but it does not cover link-down caused by faults, which can still hard-lock the system. For example, if a VM fails to connect to the PCIe device, "virsh destroy" is executed to release resources and isolate the fault, but a hard-lockup occurs while releasing the group fd. Call Trace: qi_submit_sync qi_flush_dev_iotlb intel_pasid_tear_down_entry device_block_translation blocking_domain_attach_dev __iommu_attach_device __iommu_device_set_domain __iommu_group_set_domain_internal iommu_detach_group vfio_iommu_type1_detach_group vfio_group_detach_container vfio_group_fops_release __fput Although pci_device_is_present() is slower than pci_dev_is_disconnected(), it still takes only ~70 µs on a ConnectX-5 (8 GT/s, x2) and becomes even faster as PCIe speed and width increase. Besides, devtlb_invalidation_with_pasid() is called only in the paths below, which are far less frequent than memory map/unmap. 1. mm-struct release 2. {attach,release}_dev 3. set/remove PASID 4. dirty-tracking setup The gain in system stability far outweighs the negligible cost of using pci_device_is_present() instead of pci_dev_is_disconnected() to decide when to skip ATS invalidation, especially under GDR high-load conditions.

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

  • f873b85ec762c5a6abe94a7ddb31df5d3ba07d85 to < 581ce094d9eafb78ec4f9de77bd24b780c151236affected
  • d70f1c85113cd8c2aa8373f491ca5d1b22ec0554 to < e2c78c69f8faf2885ea4ceee08c71ac738f401a0affected
  • 34a7b30f56d30114bf4d436e4dc793afe326fbcf to < ead67d0378e90f419e385a43af29435242d80c12affected
  • 2b74b2a92e524d7c8dec8e02e95ecf18b667c062 to < 01aed2f1d7cb8fdf4c60c5bb4727608cb82b401daffected
  • 4fc82cd907ac075648789cc3a00877778aa1838b to < 9813306610d0d718c863aaa70928bf57d7570ec0affected
  • 4fc82cd907ac075648789cc3a00877778aa1838b to < 9deaacc8dcaddb6ddc5b52e1e63b457450ec0f94affected
  • 4fc82cd907ac075648789cc3a00877778aa1838b to < 0da6697e577023d8867c7beb2d16a22510e4eea9affected
  • 4fc82cd907ac075648789cc3a00877778aa1838b to < 10e60d87813989e20eac1f3eda30b3bae461e7f9affected
  • c04f2780919f20e2cc4846764221f5e802555868affected
  • 025bc6b41e020aeb1e71f84ae3ffce945026de05affected
  • 5.10.214 to < 5.10.252affected
  • 5.15.153 to < 5.15.202affected
  • 6.1.83 to < 6.1.165affected
  • 6.6.23 to < 6.6.128affected
  • 6.7.11 to < 6.8affected
  • 6.8.2 to < 6.9affected

Linux Linux

Default version status: affected

  • 6.9affected
  • 0 to < 6.9unaffected
  • 5.10.252 to ≤ 5.10.*unaffected
  • 5.15.202 to ≤ 5.15.*unaffected
  • 6.1.165 to ≤ 6.1.*unaffected
  • 6.6.128 to ≤ 6.6.*unaffected
  • 6.12.75 to ≤ 6.12.*unaffected
  • 6.18.16 to ≤ 6.18.*unaffected
  • 6.19.6 to ≤ 6.19.*unaffected
  • 7.0 to ≤ *unaffected

References