CVE-2026-46061

System hang via reversed folio-buffer lock order

Published May 27, 2026 · Updated May 27, 2026

Improper locking in affected Linux Kernel jbd2 releases allows local users to hang the system through local filesystem activity. The jbd2_journal_cancel_revoke() path takes a folio lock while a buffer lock is held, reversing the writeback path and creating an ABBA deadlock. The condition requires an ext4 filesystem whose block size is smaller than the page size and concurrent directory creation and writeback activity.

CVSS severity5.5
Medium
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in affected Linux Kernel jbd2 releases allows local users to hang the system through local filesystem activity. The jbd2_journal_cancel_revoke() path takes a folio lock while a buffer lock is held, reversing the writeback path and creating an ABBA deadlock. The condition requires an ext4 filesystem whose block size is smaller than the page size and concurrent directory creation and writeback activity.

The record

CVE
CVE-2026-46061
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-667, CAPEC-25, 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=1bb7a4b6b3d7dd8da6f5a9d0529d42c22a359e71
  2. Affected versionversion=6.12.31 <6.12.86
  3. Affected versionversion=6.14.9 <6.15
  4. Affected versionversion=6.15
  5. Affected versionversion=f1c5aa614b5c251f93a6a4c8c26001d5e9e53fd6 <dff07cc98fdf6af57a7c054dc09b2050a9d5c287
  6. Affected versionversion=f76d4c28a46a9260d85e00dafc8f46d369365d33 <2b2fee890250ab647a601124471a334bb01a0790
  7. Affected versionversion=f76d4c28a46a9260d85e00dafc8f46d369365d33 <981fcc5674e67158d24d23e841523eccba19d0e7
  8. Affected versionversion=f76d4c28a46a9260d85e00dafc8f46d369365d33 <bbd943d6a2d566428324b516a37f98328dfb802d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1bb7a4b6b3d7dd8da6f5a9d0529d42c22a359e71; version=6.12.31 <6.12.86; version=6.14.9 <6.15; version=6.15; version=f1c5aa614b5c251f93a6a4c8c26001d5e9e53fd6 <dff07cc98fdf6af57a7c054dc09b2050a9d5c287; version=f76d4c28a46a9260d85e00dafc8f46d369365d33 <2b2fee890250ab647a601124471a334bb01a0790; version=f76d4c28a46a9260d85e00dafc8f46d369365d33 <981fcc5674e67158d24d23e841523eccba19d0e7; version=f76d4c28a46a9260d85e00dafc8f46d369365d33 <bbd943d6a2d566428324b516a37f98328dfb802d

Published CVSS scores

5.5NIST NVDCVSS: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.

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

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

CWE-667Improper Locking
CAPEC-25Forced Deadlock
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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