PT-2026-43761 · Linux · Linux Kernel
CVE-2026-45894
·
Published
2026-05-27
·
Updated
2026-07-21
CVSS v3.1
7.8
High
| Vector | AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
An issue exists in the Intel VT-d Scalable Mode PASID table entry handling. The current implementation zeros the entire 64-byte structure immediately using multiple 64-bit writes when tearing down an entry. Because IOMMU hardware may fetch these bytes using multiple internal transactions, zeroing the entry while it is active (where the Present bit
P is 1) can cause a torn read. This occurs when a hardware fetch happens simultaneously with the CPU zeroing the entry, potentially leading to an inconsistent state, unpredictable behavior, or spurious faults.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
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Related Identifiers
Affected Products
Linux Kernel