CVE-2026-45862
iommu/vt-d: Flush cache for PASID table before using it
Description
In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Flush cache for PASID table before using it When writing the address of a freshly allocated zero-initialized PASID table to a PASID directory entry, do that after the CPU cache flush for this PASID table, not before it, to avoid the time window when this PASID table may be already used by non-coherent IOMMU hardware while its contents in RAM is still some random old data, not zero-initialized.
INFO
Published Date :
May 27, 2026, 2:16 p.m.
Last Modified :
May 30, 2026, 11:17 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Apply the kernel patch that corrects cache flush ordering.
- Update the Linux kernel to the fixed version.
- Verify cache coherency for IOMMU operations.
Public PoC/Exploit Available at Github
CVE-2026-45862 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
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information, practical solutions, and valuable tools related to
CVE-2026-45862.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-45862 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
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stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-45862
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
DSA and DLA for Debian last 14 days
Python
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The following table lists the changes that have been made to the
CVE-2026-45862 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 30, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 27, 2026
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Flush cache for PASID table before using it When writing the address of a freshly allocated zero-initialized PASID table to a PASID directory entry, do that after the CPU cache flush for this PASID table, not before it, to avoid the time window when this PASID table may be already used by non-coherent IOMMU hardware while its contents in RAM is still some random old data, not zero-initialized. Added Reference https://git.kernel.org/stable/c/0616137b70e6d9a547d4b60df8e1b64e36d83661 Added Reference https://git.kernel.org/stable/c/22d169bdd2849fe6bd18c2643742e1c02be6451c Added Reference https://git.kernel.org/stable/c/36244dfd3853f7bf89d03b8e90d56b23ce7fbc16 Added Reference https://git.kernel.org/stable/c/36990407cdd257473607e33802d00e978af2759e Added Reference https://git.kernel.org/stable/c/5962c30a6f05ea1ab73f039e235bb30716243517 Added Reference https://git.kernel.org/stable/c/c93f23375d8c410954b0df825e814b632fd62b9d Added Reference https://git.kernel.org/stable/c/cd75e77125c8a51754ca4cd60b4ca083ed735d1d Added Reference https://git.kernel.org/stable/c/d15cda135148ea7ba929cfdbcf208182bc29a7aa