CVE-2026-89758Hinoki check available

Kernel crash via device-private PMD misinterpretation

Published Sep 11, 2026 · Updated Sep 11, 2026

A memory-management flaw in Linux 6.19 allows local users to crash the kernel through memory-policy calls on device-private THPs. queue_folios_pmd passes a non-present device-private PMD to pmd_folio, which interprets its softleaf encoding as a hardware PFN and returns a bogus folio pointer. The path requires an HMM-based GPU driver to migrate an anonymous THP into device memory before a local user invokes mbind, migrate_pages, or set_mempolicy_home_node; outcomes include a kernel crash or unintended LRU folio isolation.

CVSS severityUnavailable
Unscored
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

A memory-management flaw in Linux 6.19 allows local users to crash the kernel through memory-policy calls on device-private THPs. queue_folios_pmd passes a non-present device-private PMD to pmd_folio, which interprets its softleaf encoding as a hardware PFN and returns a bogus folio pointer. The path requires an HMM-based GPU driver to migrate an anonymous THP into device memory before a local user invokes mbind, migrate_pages, or set_mempolicy_home_node; outcomes include a kernel crash or unintended LRU folio isolation.

The record

CVE
CVE-2026-89758
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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=368076f52ebeecd33e10a9f80905d7508b6b6149 <2858b4027f491e6fdb8ee2d8923798b619bf2791
  2. Affected versionversion=368076f52ebeecd33e10a9f80905d7508b6b6149 <3d927093b2add7ced588a926c3dc5d7a83f18596
  3. Affected versionversion=6.19

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=368076f52ebeecd33e10a9f80905d7508b6b6149 <2858b4027f491e6fdb8ee2d8923798b619bf2791; version=368076f52ebeecd33e10a9f80905d7508b6b6149 <3d927093b2add7ced588a926c3dc5d7a83f18596; version=6.19

Published CVSS scores

No CVSS assessment is available in this record.

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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