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.
References
Configurations
Configuration 1 (hide)
|
History
08 May 2026, 17:44
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/01aed2f1d7cb8fdf4c60c5bb4727608cb82b401d - Patch | |
| References | () https://git.kernel.org/stable/c/0da6697e577023d8867c7beb2d16a22510e4eea9 - Patch | |
| References | () https://git.kernel.org/stable/c/10e60d87813989e20eac1f3eda30b3bae461e7f9 - Patch | |
| References | () https://git.kernel.org/stable/c/581ce094d9eafb78ec4f9de77bd24b780c151236 - Patch | |
| References | () https://git.kernel.org/stable/c/9813306610d0d718c863aaa70928bf57d7570ec0 - Patch | |
| References | () https://git.kernel.org/stable/c/9deaacc8dcaddb6ddc5b52e1e63b457450ec0f94 - Patch | |
| References | () https://git.kernel.org/stable/c/e2c78c69f8faf2885ea4ceee08c71ac738f401a0 - Patch | |
| References | () https://git.kernel.org/stable/c/ead67d0378e90f419e385a43af29435242d80c12 - Patch | |
| First Time |
Linux linux Kernel
Linux |
|
| CWE | NVD-CWE-noinfo | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
06 May 2026, 12:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-06 12:16
Updated : 2026-05-08 17:44
NVD link : CVE-2026-43130
Mitre link : CVE-2026-43130
CVE.ORG link : CVE-2026-43130
JSON object : View
Products Affected
linux
- linux_kernel
CWE