CVE-2026-46017Public exploit

Conditional kernel panic via folio migration race

Published May 27, 2026 · Updated May 27, 2026

Race condition in Linux Kernel before 7.0.4 allows local users to trigger a kernel warning during concurrent folio migration and unmapping. migrate_folio_move() exposes the destination folio before restoring its deferred-split queue state, while deferred_split_scan() discards a locked folio when folio_trylock() fails. A system panic requires panic_on_warn=1; with the default value of 0, Linux records the warning and continues operation.

CVSS severity4.7
Medium
EPSS probability0.10%
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 Linux Kernel before 7.0.4 allows local users to trigger a kernel warning during concurrent folio migration and unmapping. migrate_folio_move() exposes the destination folio before restoring its deferred-split queue state, while deferred_split_scan() discards a locked folio when folio_trylock() fails. A system panic requires panic_on_warn=1; with the default value of 0, Linux records the warning and continues operation.

The record

CVE
CVE-2026-46017
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-362, T1499.004
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=0 <7.0.4
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3bac01168982ec3e3bf87efdc1807c7933590a85
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cbf75cf212ee6e499abc1757fb4b5ae6d70ed0aa

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0 <7.0.4; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3bac01168982ec3e3bf87efdc1807c7933590a85; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cbf75cf212ee6e499abc1757fb4b5ae6d70ed0aa

Published CVSS scores

4.7NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:H/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 exploitPublished

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1499.004Application or System Exploitation

Public exploit references

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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