CVE-2023-53564

Kernel crash via stale defragmentation journal access

Published Oct 4, 2025 · Updated Oct 4, 2025

Reachable assertion in the Linux kernel OCFS2 subsystem allows local users to crash the kernel through filesystem defragmentation. During __ocfs2_move_extent, ocfs2_split_extent restarts the JBD2 transaction, but the caller later dirties metadata under stale journal access. Exploitation requires local access and permission to invoke the OCFS2 move-extents operation against a mounted OCFS2 filesystem; the bounded consequence is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in the Linux kernel OCFS2 subsystem allows local users to crash the kernel through filesystem defragmentation. During __ocfs2_move_extent, ocfs2_split_extent restarts the JBD2 transaction, but the caller later dirties metadata under stale journal access. Exploitation requires local access and permission to invoke the OCFS2 move-extents operation against a mounted OCFS2 filesystem; the bounded consequence is a kernel crash.

The record

CVE
CVE-2023-53564
Published
Oct 4, 2025
Updated
Oct 4, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-617, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 4, 2025Record 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2c559b3ba8e0b9e3c4bb08159a28ccadc698410f
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <33665d1042666f2e5c736a3df1f453e31f030663
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <590507ebabd33cd93324c04f9a5538309a5ba934
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5f43d34a51ed30e6a60f7e59d224a63014fe2cd5
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <60eed1e3d45045623e46944ebc7c42c30a4350f0
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <669134a66d37258e1c4a5cfbd5b82f547ae30fca
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7f3b1c28e2908755fb248d3ee8ff56826f2387db
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8163ea90d89b7012dd1fa4b28edf5db0c641eca7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2c559b3ba8e0b9e3c4bb08159a28ccadc698410f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <33665d1042666f2e5c736a3df1f453e31f030663; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <590507ebabd33cd93324c04f9a5538309a5ba934; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5f43d34a51ed30e6a60f7e59d224a63014fe2cd5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <60eed1e3d45045623e46944ebc7c42c30a4350f0; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <669134a66d37258e1c4a5cfbd5b82f547ae30fca; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7f3b1c28e2908755fb248d3ee8ff56826f2387db; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8163ea90d89b7012dd1fa4b28edf5db0c641eca7

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.

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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

CWE-617Reachable Assertion
T1499Endpoint Denial of Service

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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