CVE-2025-37839

Kernel warning via valid zero transaction ID

Published May 9, 2025 · Updated May 23, 2026

An incorrect assertion in Linux kernel jbd2 allows local users to trigger a kernel warning when a valid journal transaction ID is zero. The jbd2_journal_update_sb_log_tail function tests sb->s_sequence even though sb->s_start determines journal emptiness and zero is a valid sequence value. A local journal-tail update with sequence zero reaches WARN_ON; service interruption is limited to systems configured to panic on kernel warnings.

CVSS severity7.8
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An incorrect assertion in Linux kernel jbd2 allows local users to trigger a kernel warning when a valid journal transaction ID is zero. The jbd2_journal_update_sb_log_tail function tests sb->s_sequence even though sb->s_start determines journal emptiness and zero is a valid sequence value. A local journal-tail update with sequence zero reaches WARN_ON; service interruption is limited to systems configured to panic on kernel warnings.

The record

CVE
CVE-2025-37839
Published
May 9, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 9, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=24bcc89c7e7c64982e6192b4952a0a92379fc341 <3b4643ffaf72d7a5a357e9bf68b1775f8cfe7e77
  2. Affected versionversion=24bcc89c7e7c64982e6192b4952a0a92379fc341 <9eaec071f111cd2124ce9a5b93536d3f6837d457
  3. Affected versionversion=24bcc89c7e7c64982e6192b4952a0a92379fc341 <ad926f735b4d4f10768fec7d080cadeb6d075cac
  4. Affected versionversion=24bcc89c7e7c64982e6192b4952a0a92379fc341 <b0cca357f85beb6144ab60c62dcc98508cc044bf
  5. Affected versionversion=24bcc89c7e7c64982e6192b4952a0a92379fc341 <b479839525fe7906966cdc4b5b2afbca048558a1
  6. Affected versionversion=24bcc89c7e7c64982e6192b4952a0a92379fc341 <c88f7328bb0fff66520fc9164f02b1d06e083c1b
  7. Affected versionversion=24bcc89c7e7c64982e6192b4952a0a92379fc341 <c98eb9ffb1d9c98237b5e1668eee17654e129fb0
  8. Affected versionversion=24bcc89c7e7c64982e6192b4952a0a92379fc341 <cf30432f5b3064ff85d85639c2f0106f89c566f6
  9. Affected versionversion=24bcc89c7e7c64982e6192b4952a0a92379fc341 <e6eff39dd0fe4190c6146069cc16d160e71d1148
  10. Affected versionversion=3.2.71 <3.3
  11. Affected versionversion=3.4
  12. Affected versionversion=dd8ff32c1e7ed10fb0e168b4431983e09acbeb2f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=24bcc89c7e7c64982e6192b4952a0a92379fc341 <3b4643ffaf72d7a5a357e9bf68b1775f8cfe7e77; version=24bcc89c7e7c64982e6192b4952a0a92379fc341 <9eaec071f111cd2124ce9a5b93536d3f6837d457; version=24bcc89c7e7c64982e6192b4952a0a92379fc341 <ad926f735b4d4f10768fec7d080cadeb6d075cac; version=24bcc89c7e7c64982e6192b4952a0a92379fc341 <b0cca357f85beb6144ab60c62dcc98508cc044bf; version=24bcc89c7e7c64982e6192b4952a0a92379fc341 <b479839525fe7906966cdc4b5b2afbca048558a1; version=24bcc89c7e7c64982e6192b4952a0a92379fc341 <c88f7328bb0fff66520fc9164f02b1d06e083c1b; version=24bcc89c7e7c64982e6192b4952a0a92379fc341 <c98eb9ffb1d9c98237b5e1668eee17654e129fb0; version=24bcc89c7e7c64982e6192b4952a0a92379fc341 <cf30432f5b3064ff85d85639c2f0106f89c566f6; version=24bcc89c7e7c64982e6192b4952a0a92379fc341 <e6eff39dd0fe4190c6146069cc16d160e71d1148; version=3.2.71 <3.3; version=3.4; version=dd8ff32c1e7ed10fb0e168b4431983e09acbeb2f

Published CVSS scores

3.3SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

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

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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