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CVE-2026-89451

Unknown

Last modified

CVE-2026-89451 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: iommu/sva: Set handle->dev before the SVA handle is visible iommu_attach_device_pasid() installs the new SVA attach handle in the group PASID lookup before iommu_sva_bind_device() returns. A concurrent bind can therefore find and reuse the same handle after iommu_sva_lock is dropped. handle->dev was initialized after dropping iommu_sva_lock.

Description

In the Linux kernel, the following vulnerability has been resolved: iommu/sva: Set handle->dev before the SVA handle is visible iommu_attach_device_pasid() installs the new SVA attach handle in the group PASID lookup before iommu_sva_bind_device() returns. A concurrent bind can therefore find and reuse the same handle after iommu_sva_lock is dropped. handle->dev was initialized after dropping iommu_sva_lock. This leaves a window where a racing bind can return a handle whose dev pointer is still NULL. A subsequent iommu_sva_unbind_device() can then dereference it via handle->dev->iommu_group. Initialize handle->dev before releasing iommu_sva_lock so any visible SVA handle is fully initialized.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= be51b1d6bbff48c7d1943a8ff1e5a55777807f6e, < bcffb1c75da8fc9d51168ff9f09d471c26507912; >= be51b1d6bbff48c7d1943a8ff1e5a55777807f6e, < 968e9a1f71140c86dc4092f6b361e997923f3813; >= be51b1d6bbff48c7d1943a8ff1e5a55777807f6e, < 37a96a30617a4c96f048a5874c00509bc4fe4d85; >= be51b1d6bbff48c7d1943a8ff1e5a55777807f6e, < 530f8f9c3546cb3ebee1b135375aaee08a073ebb
LinuxLinux6.2

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-89451?
In the Linux kernel, the following vulnerability has been resolved: iommu/sva: Set handle->dev before the SVA handle is visible iommu_attach_device_pasid() installs the new SVA attach handle in the group PASID lookup before iommu_sva_bind_device() returns. A concurrent bind can therefore find and reuse the same handle after iommu_sva_lock is dropped. handle->dev was initialized after dropping iommu_sva_lock. This leaves a window where a racing bind can return a handle whose dev pointer is still NULL. A subsequent iommu_sva_unbind_device() can then dereference it via handle->dev->iommu_group. Initialize handle->dev before releasing iommu_sva_lock so any visible SVA handle is fully initialized.
How severe is CVE-2026-89451?
Severity scoring for CVE-2026-89451 is pending analysis.
How do I fix CVE-2026-89451?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST