CVE-2025-68337

System crash via jbd2 assertion on corrupted filesystem

Published Dec 22, 2025 · Updated Dec 22, 2025

Denial of service in Linux jbd2 allows attackers to crash the system through operations on an inconsistent ext4 file system. In jbd2_journal_get_create_access(), reused blocks caused by inconsistent bitmap data violate an assumed invariant, and J_ASSERT invokes BUG_ON instead of aborting the journal. Triggering it requires errors=continue mode with storage failures and inconsistent metadata, or a deliberately constructed image and specific operations.

CVSS severity7.5
High
EPSS probability0.53%
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 jbd2 allows attackers to crash the system through operations on an inconsistent ext4 file system. In jbd2_journal_get_create_access(), reused blocks caused by inconsistent bitmap data violate an assumed invariant, and J_ASSERT invokes BUG_ON instead of aborting the journal. Triggering it requires errors=continue mode with storage failures and inconsistent metadata, or a deliberately constructed image and specific operations.

The record

CVE
CVE-2025-68337
Published
Dec 22, 2025
Updated
Dec 22, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Dec 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 22, 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=2.6.19
  2. Affected versionversion=470decc613ab2048b619a01028072d932d9086ee <986835bf4d11032bba4ab8414d18fce038c61bb4
  3. Affected versionversion=470decc613ab2048b619a01028072d932d9086ee <a2a7f854d154a3e9232fec80782dad951655f52f
  4. Affected versionversion=470decc613ab2048b619a01028072d932d9086ee <aa1703f3f706ea0867fb1991dcac709c9ec94cfb
  5. Affected versionversion=470decc613ab2048b619a01028072d932d9086ee <bf34c72337e40c4670cceeb79b353356933a254b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.19; version=470decc613ab2048b619a01028072d932d9086ee <986835bf4d11032bba4ab8414d18fce038c61bb4; version=470decc613ab2048b619a01028072d932d9086ee <a2a7f854d154a3e9232fec80782dad951655f52f; version=470decc613ab2048b619a01028072d932d9086ee <aa1703f3f706ea0867fb1991dcac709c9ec94cfb; version=470decc613ab2048b619a01028072d932d9086ee <bf34c72337e40c4670cceeb79b353356933a254b

Published CVSS scores

7.5CanonicalCVSS:3.1/AV:N/AC:L/PR:N/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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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