CVE-2026-45862

Local host-memory access via stale PASID entries

Published May 27, 2026 · Updated May 27, 2026

Race condition in Intel IOMMU code in Linux Kernel allows local users to read or write host memory through stale PASID entries. The PASID-table allocation path in drivers/iommu/intel/pasid.c publishes the table address before flushing its zeroed contents from the CPU cache, allowing non-coherent hardware to consume stale RAM. Exploitation requires low-privileged local access to an SVA-capable accelerator or guest IOMMUFD path, non-coherent VT-d hardware, and a timing win; successful DMA can escape its domain, corrupt memory, or crash or hang the host.

CVSS severity7.8
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Intel IOMMU code in Linux Kernel allows local users to read or write host memory through stale PASID entries. The PASID-table allocation path in drivers/iommu/intel/pasid.c publishes the table address before flushing its zeroed contents from the CPU cache, allowing non-coherent hardware to consume stale RAM. Exploitation requires low-privileged local access to an SVA-capable accelerator or guest IOMMUFD path, non-coherent VT-d hardware, and a timing win; successful DMA can escape its domain, corrupt memory, or crash or hang the host.

The record

CVE
CVE-2026-45862
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=194b3348bdbb7db65375c72f3f774aee4cc6614e <22d169bdd2849fe6bd18c2643742e1c02be6451c
  2. Affected versionversion=194b3348bdbb7db65375c72f3f774aee4cc6614e <36244dfd3853f7bf89d03b8e90d56b23ce7fbc16
  3. Affected versionversion=194b3348bdbb7db65375c72f3f774aee4cc6614e <5962c30a6f05ea1ab73f039e235bb30716243517
  4. Affected versionversion=194b3348bdbb7db65375c72f3f774aee4cc6614e <c93f23375d8c410954b0df825e814b632fd62b9d
  5. Affected versionversion=194b3348bdbb7db65375c72f3f774aee4cc6614e <d15cda135148ea7ba929cfdbcf208182bc29a7aa
  6. Affected versionversion=1b48c70feefc499b62670521efa002ab01e05df5
  7. Affected versionversion=2bed9455db7cc0ab7ece6b3d846472097b52855a <36990407cdd257473607e33802d00e978af2759e
  8. Affected versionversion=5.10.175 <5.10.252
  9. Affected versionversion=5.15.103 <5.15.202
  10. Affected versionversion=5.4.237 <5.5
  11. Affected versionversion=5c65f097124770c3e5b9b83ed1a8b68c119bc7b5 <0616137b70e6d9a547d4b60df8e1b64e36d83661
  12. Affected versionversion=6.1.16 <6.1.165
  13. Affected versionversion=6.2.3 <6.3
  14. Affected versionversion=6.3
  15. Affected versionversion=7e00b52c8cdd9d3a985d63d72ecae7bde6314883 <cd75e77125c8a51754ca4cd60b4ca083ed735d1d
  16. Affected versionversion=bc348a6cc8f92e9979fbfbb3c6b48fd51b4b1dbf

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=194b3348bdbb7db65375c72f3f774aee4cc6614e <22d169bdd2849fe6bd18c2643742e1c02be6451c; version=194b3348bdbb7db65375c72f3f774aee4cc6614e <36244dfd3853f7bf89d03b8e90d56b23ce7fbc16; version=194b3348bdbb7db65375c72f3f774aee4cc6614e <5962c30a6f05ea1ab73f039e235bb30716243517; version=194b3348bdbb7db65375c72f3f774aee4cc6614e <c93f23375d8c410954b0df825e814b632fd62b9d; version=194b3348bdbb7db65375c72f3f774aee4cc6614e <d15cda135148ea7ba929cfdbcf208182bc29a7aa; version=1b48c70feefc499b62670521efa002ab01e05df5; version=2bed9455db7cc0ab7ece6b3d846472097b52855a <36990407cdd257473607e33802d00e978af2759e; version=5.10.175 <5.10.252; version=5.15.103 <5.15.202; version=5.4.237 <5.5; version=5c65f097124770c3e5b9b83ed1a8b68c119bc7b5 <0616137b70e6d9a547d4b60df8e1b64e36d83661; version=6.1.16 <6.1.165; version=6.2.3 <6.3; version=6.3; version=7e00b52c8cdd9d3a985d63d72ecae7bde6314883 <cd75e77125c8a51754ca4cd60b4ca083ed735d1d; version=bc348a6cc8f92e9979fbfbb3c6b48fd51b4b1dbf

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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