In the Linux kernel, the following vulnerability has been resolved:
iommu/vt-d: Fix WARN_ON in iommu probe path
Commit 1a75cc710b95 ("iommu/vt-d: Use rbtree to track iommu probed devices") adds all devices probed by the iommu driver in a rbtree indexed by the source ID of each device. It assumes that each device has a unique source ID. This assumption is incorrect and the VT-d spec doesn't state this requirement either.
The reason for using a rbtree to track devices is to look up the device with PCI bus and devfunc in the paths of handling ATS invalidation time out error and the PRI I/O page faults. Both are PCI ATS feature related.
Only track the devices that have PCI ATS capabilities in the rbtree to avoid unnecessary WARN_ON in the iommu probe path. Otherwise, on some platforms below kernel splat will be displayed and the iommu probe results in failure.
WARNING: CPU: 3 PID: 166 at drivers/iommu/intel/iommu.c:158 intel_iommu_probe_device+0x319/0xd90 Call Trace: <TASK> ? __warn+0x7e/0x180 ? intel_iommu_probe_device+0x319/0xd90 ? report_bug+0x1f8/0x200 ? handle_bug+0x3c/0x70 ? exc_invalid_op+0x18/0x70 ? asm_exc_invalid_op+0x1a/0x20 ? intel_iommu_probe_device+0x319/0xd90 ? debug_mutex_init+0x37/0x50 __iommu_probe_device+0xf2/0x4f0 iommu_probe_device+0x22/0x70 iommu_bus_notifier+0x1e/0x40 notifier_call_chain+0x46/0x150 blocking_notifier_call_chain+0x42/0x60 bus_notify+0x2f/0x50 device_add+0x5ed/0x7e0 platform_device_add+0xf5/0x240 mfd_add_devices+0x3f9/0x500 ? preempt_count_add+0x4c/0xa0 ? up_write+0xa2/0x1b0 ? __debugfs_create_file+0xe3/0x150 intel_lpss_probe+0x49f/0x5b0 ? pci_conf1_write+0xa3/0xf0 intel_lpss_pci_probe+0xcf/0x110 [intel_lpss_pci] pci_device_probe+0x95/0x120 really_probe+0xd9/0x370 ? __pfx___driver_attach+0x10/0x10 __driver_probe_device+0x73/0x150 driver_probe_device+0x19/0xa0 __driver_attach+0xb6/0x180 ? __pfx___driver_attach+0x10/0x10 bus_for_each_dev+0x77/0xd0 bus_add_driver+0x114/0x210 driver_register+0x5b/0x110 ? __pfx_intel_lpss_pci_driver_init+0x10/0x10 [intel_lpss_pci] do_one_initcall+0x57/0x2b0 ? kmalloc_trace+0x21e/0x280 ? do_init_module+0x1e/0x210 do_init_module+0x5f/0x210 load_module+0x1d37/0x1fc0 ? init_module_from_file+0x86/0xd0 init_module_from_file+0x86/0xd0 idempotent_init_module+0x17c/0x230 __x64_sys_finit_module+0x56/0xb0 do_syscall_64+0x6e/0x140 entry_SYSCALL_64_after_hwframe+0x71/0x79
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 27, 2026 | Jul 27, 2026 |
| Redhat_linux | — | Upgrade kernel-rtNo solution existsUpgrade kernel | Dec 5, 2024 | May 20, 2024 |
| Suse | — | Upgrade kernel-develUpgrade reiserfs-kmp-defaultUpgrade kernel-debug-livepatch-develUpgrade dtb-socionextUpgrade kernel-source-azureUpgrade kernel-default-develUpgrade kernel-azure-optionalUpgrade kernel-rt-develUpgrade dtb-appleUpgrade kernel-kvmsmallUpgrade kernel-macrosUpgrade kernel-debug-develUpgrade ocfs2-kmp-64kbUpgrade cluster-md-kmp-rtUpgrade kernel-default-optionalUpgrade dlm-kmp-azureUpgrade dtb-broadcomUpgrade dtb-freescaleUpgrade kernel-kvmsmall-livepatch-develUpgrade kernel-64kbUpgrade kernel-64kb-develUpgrade kernel-obs-qaUpgrade dtb-hisiliconUpgrade kernel-devel-azureUpgrade kselftests-kmp-64kbUpgrade gfs2-kmp-64kbUpgrade kernel-syms-azureUpgrade kernel-64kb-optionalUpgrade kernel-symsUpgrade ocfs2-kmp-rtUpgrade kernel-rt_debugUpgrade dlm-kmp-64kbUpgrade ocfs2-kmp-azureUpgrade kernel-default-livepatchUpgrade kernel-default-livepatch-develUpgrade dtb-exynosUpgrade dtb-marvellUpgrade dtb-xilinxUpgrade gfs2-kmp-rtUpgrade kernel-zfcpdumpUpgrade kernel-kvmsmall-develUpgrade dtb-renesasUpgrade kernel-docs-htmlUpgrade reiserfs-kmp-rtUpgrade dtb-amazonUpgrade dtb-apmUpgrade cluster-md-kmp-azureUpgrade kernel-azure-extraUpgrade kernel-rt_debug-vdsoUpgrade kernel-default-extraUpgrade dtb-lgUpgrade kernel-debugUpgrade kernel-default-vdsoUpgrade cluster-md-kmp-defaultUpgrade dtb-mediatekUpgrade dtb-amdUpgrade dtb-amlogicUpgrade kernel-sourceUpgrade kernel-devel-rtUpgrade kernel-64kb-livepatch-develUpgrade kernel-source-rtUpgrade kernel-rt-optionalUpgrade kselftests-kmp-azureUpgrade kselftests-kmp-defaultUpgrade kernel-rt_debug-develUpgrade kernel-defaultUpgrade gfs2-kmp-defaultUpgrade dtb-armUpgrade kernel-syms-rtUpgrade kernel-rt-vdsoUpgrade dtb-alteraUpgrade gfs2-kmp-azureUpgrade kernel-azure-develUpgrade dtb-rockchipUpgrade dtb-caviumUpgrade kernel-azure-vdsoUpgrade kernel-obs-buildUpgrade dtb-nvidiaUpgrade ocfs2-kmp-defaultUpgrade kernel-kvmsmall-vdsoUpgrade kernel-default-baseUpgrade kernel-azureUpgrade dlm-kmp-defaultUpgrade kernel-rt-livepatch-develUpgrade reiserfs-kmp-64kbUpgrade kernel-docsUpgrade dtb-sprdUpgrade kernel-azure-livepatch-develUpgrade cluster-md-kmp-64kbUpgrade kernel-64kb-extraUpgrade dtb-allwinnerUpgrade kernel-rt_debug-livepatch-develUpgrade kernel-rt-extraUpgrade kernel-debug-vdsoUpgrade dtb-qcomUpgrade kernel-source-vanillaUpgrade dlm-kmp-rtUpgrade reiserfs-kmp-azureUpgrade kselftests-kmp-rtUpgrade kernel-default-base-rebuildUpgrade kernel-rt | Jul 23, 2024 | May 20, 2024 |
| Ubuntu | — | Upgrade linux-image-oem-24.04aUpgrade linux-image-lowlatency-64kUpgrade linux-image-6.8.0-1008-oemUpgrade linux-image-ibmUpgrade linux-image-lowlatencyUpgrade linux-image-azure-fdeUpgrade linux-image-6.8.0-1006-gkeUpgrade linux-image-nvidia-64kUpgrade linux-image-nvidiaUpgrade linux-image-intelUpgrade linux-image-azureUpgrade linux-image-6.8.0-38-generic-64kUpgrade linux-image-6.8.0-1010-gcpUpgrade linux-image-oracle-64kUpgrade linux-image-generic-64kUpgrade linux-image-6.8.0-1011-awsUpgrade linux-image-genericUpgrade linux-image-6.8.0-1008-oracleUpgrade linux-image-generic-lpaeUpgrade linux-image-6.8.0-1008-ibmUpgrade linux-image-6.8.0-1009-nvidia-64kUpgrade linux-image-ibm-classicUpgrade linux-image-raspiUpgrade linux-image-6.8.0-1007-intelUpgrade linux-image-kvmUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-6.8.0-38-lowlatency-64kUpgrade linux-image-6.8.0-1008-oracle-64kUpgrade linux-image-oem-24.04Upgrade linux-image-virtualUpgrade linux-image-6.8.0-1010-azureUpgrade linux-image-6.8.0-38-genericUpgrade linux-image-6.8.0-1007-raspiUpgrade linux-image-oracleUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-6.8.0-1010-azure-fdeUpgrade linux-image-6.8.0-38-lowlatencyUpgrade linux-image-awsUpgrade linux-image-gcpUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-6.8.0-1009-nvidiaUpgrade linux-image-gke | Jul 12, 2024 | May 20, 2024 |
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