iommu/vt-d: Fix oops due to out of scope access

Summary

In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Fix oops due to out of scope access Below oops triggers when kill QEMU process: Oops: general protection fault, probably for non-canonical address 0x7fffffff844eaaa7: 0000 [#1] SMP NOPTI Call Trace: <TASK> do_raw_spin_lock+0xaa/0xc0 _raw_spin_lock_irqsave+0x21/0x40 domain_remove_dev_pasid+0x52/0x160 intel_nested_set_dev_pasid+0x1b9/0x1e0 __iommu_set_group_pasid+0x56/0x120 pci_dev_reset_iommu_done+0xe3/0x180 pcie_flr+0x65/0x160 __pci_reset_function_locked+0x5b/0x120 vfio_pci_core_close_device+0x63/0xe0 [vfio_pci_core] vfio_df_close+0x4f/0xa0 vfio_df_unbind_iommufd+0x2d/0x60 vfio_device_fops_release+0x3e/0x40 __fput+0xe5/0x2c0 task_work_run+0x58/0xa0 do_exit+0x2c8/0x600 do_group_exit+0x2f/0xa0 get_signal+0x863/0x8c0 arch_do_signal_or_restart+0x24/0x100 exit_to_user_mode_loop+0x87/0x380 do_syscall_64+0x2ff/0x11e0 entry_SYSCALL_64_after_hwframe+0x76/0x7e The global static blocked domain is a dummy domain without corresponding dmar_domain structure, accessing beyond iommu_domain structure triggers oops easily. Fix it by return early in domain_remove_dev_pasid() like identity domain.

Timeline

1. Jun 24, 2026, 4:28 PM UTCCVE published
2. Oct 16, 2026, 3:23 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Oct 19, 2026, 7:47 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 7d0c9da6c1509664d96488042bacc02308ca33b2 · fixed in 88397fad7914ee74a7880fa5ce01f9eb6bfe0743; From 7d0c9da6c1509664d96488042bacc02308ca33b2 · fixed in 1e659db468476733d217c1314c1e0d9244356d6c; From 7d0c9da6c1509664d96488042bacc02308ca33b2 · fixed in a6dea58d8625c06b9654c0555f101742481335c3

• Linux Linux

  6.6

• KernelLinux

  From 6.6.0 · fixed in 6.18.33; From 6.19.0 · fixed in 7.0.10

References 3