CVE-2026-64591

Kernel disruption via unmatched IOPF disablement

Published Aug 6, 2026 · Updated Aug 6, 2026

Denial of service in Linux 6.18.20 through 6.18.38 and 7.0 through 7.1.3 allows local users to trigger a kernel WARNING. The Intel IOMMU SVA unbind path calls intel_iommu_disable_iopf() for a non-PRI device even though the bind path never enabled IOPF. The condition requires Intel VT-d SVA on hardware lacking PCI Page Request Interface support and an SVA unbind operation; the documented consequence is the WARNING and low availability impact.

CVSS severity3.3
Low
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux 6.18.20 through 6.18.38 and 7.0 through 7.1.3 allows local users to trigger a kernel WARNING. The Intel IOMMU SVA unbind path calls intel_iommu_disable_iopf() for a non-PRI device even though the bind path never enabled IOPF. The condition requires Intel VT-d SVA on hardware lacking PCI Page Request Interface support and an SVA unbind operation; the documented consequence is the WARNING and low availability impact.

The record

CVE
CVE-2026-64591
Published
Aug 6, 2026
Updated
Aug 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 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=39c20c4e83b9f78988541d829aa34668904e54a0 <477f8dec3b5ae54e8ef3c33bdd2257e47896512e
  2. Affected versionversion=39c20c4e83b9f78988541d829aa34668904e54a0 <534b5f98ab7319d8004bbc7dab6481462243e883
  3. Affected versionversion=46461dabb95239aa05e31e247cd21151b8406642
  4. Affected versionversion=6.18.20 <6.18.39
  5. Affected versionversion=6.19.10 <6.20
  6. Affected versionversion=7.0
  7. Affected versionversion=ee312bb1052e45cbccaf6abac1012db9ca43150a <bb354384f40bb087e7c44f0f0743a23fc945f91d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=39c20c4e83b9f78988541d829aa34668904e54a0 <477f8dec3b5ae54e8ef3c33bdd2257e47896512e; version=39c20c4e83b9f78988541d829aa34668904e54a0 <534b5f98ab7319d8004bbc7dab6481462243e883; version=46461dabb95239aa05e31e247cd21151b8406642; version=6.18.20 <6.18.39; version=6.19.10 <6.20; version=7.0; version=ee312bb1052e45cbccaf6abac1012db9ca43150a <bb354384f40bb087e7c44f0f0743a23fc945f91d

Published CVSS scores

3.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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