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NVD / CVE Program· CNA Linux

CVE-2025-37839: jbd2: remove wrong sb->s_sequence check

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.33% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 3.3, 3b4643ffaf72d7a5a357e9bf68b1775f8cfe7e77, 9eaec071f111cd2124ce9a5b93536d3f6837d457; azl3 kernel 6.6.85.1-4 on Azure Linux 3.0 6.6.92.2-1; azl3 kernel 6.6.92.2-1 on Azure Linux 3.0 6.6.92.2-1.

Low priority for now. Upgrade to Linux Linux 3.3, 3b4643ffaf72d7a5a357e9bf68b1775f8cfe7e77, 9eaec071f111cd2124ce9a5b93536d3f6837d457; azl3 kernel 6.6.85.1-4 on Azure Linux 3.0 6.6.92.2-1; azl3 kernel 6.6.92.2-1 on Azure Linux 3.0 6.6.92.2-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: jbd2: remove wrong sb->s_sequence check Journal emptiness is not determined by sb->s_sequence == 0 but rather by sb->s_start == 0 (which is set a few lines above). Furthermore 0 is a valid transaction ID so the check can spuriously trigger. Remove the invalid WARN_ON.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
May 9, 2025
Updated
Nov 5, 2026
EPSS
0.3% · 26th percentile
CWE
—

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2025-37839

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
debiandebian linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux11.0
  • linux linux kernel5.5 and later · before 5.10.237
  • linux linux kernel5.11 and later · before 5.15.181
  • linux linux kernel5.16 and later · before 6.1.135
  • linux linux kernelbefore 5.4.293
  • linux linux kernel6.7 and later · before 6.12.24
  • linux linux kernel6.13 and later · before 6.13.12
  • linux linux kernel6.14 and later · before 6.14.3
  • linux linux kernel6.2 and later · before 6.6.88

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • dd8ff32c1e7ed10fb0e168b4431983e09acbeb2f, 3.4affected
    • 24bcc89c7e7c64982e6192b4952a0a92379fc341 and later · before cf30432f5b3064ff85d85639c2f0106f89c566f6affected · git
    • 24bcc89c7e7c64982e6192b4952a0a92379fc341 and later · before b479839525fe7906966cdc4b5b2afbca048558a1affected · git
    • 24bcc89c7e7c64982e6192b4952a0a92379fc341 and later · before ad926f735b4d4f10768fec7d080cadeb6d075cacaffected · git
    • 24bcc89c7e7c64982e6192b4952a0a92379fc341 and later · before 3b4643ffaf72d7a5a357e9bf68b1775f8cfe7e77affected · git
    • 24bcc89c7e7c64982e6192b4952a0a92379fc341 and later · before c88f7328bb0fff66520fc9164f02b1d06e083c1baffected · git
    • 24bcc89c7e7c64982e6192b4952a0a92379fc341 and later · before 9eaec071f111cd2124ce9a5b93536d3f6837d457affected · git
    • 24bcc89c7e7c64982e6192b4952a0a92379fc341 and later · before c98eb9ffb1d9c98237b5e1668eee17654e129fb0affected · git
    • 24bcc89c7e7c64982e6192b4952a0a92379fc341 and later · before b0cca357f85beb6144ab60c62dcc98508cc044bfaffected · git
    • 24bcc89c7e7c64982e6192b4952a0a92379fc341 and later · before e6eff39dd0fe4190c6146069cc16d160e71d1148affected · git

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.135-16.1.135-1
Debian:13linuxbefore 6.12.25-16.12.25-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2025-37836May 9, 2025 · PCI: Fix reference leak in pci_register_host_bridge()
    22Monitor
  • ← EarlierCVE-2025-37837May 9, 2025 · iommu/tegra241-cmdqv: Fix warnings due to dmam_free_coherent()
    22Monitor
  • Later →CVE-2025-37842May 9, 2025 · spi: fsl-qspi: use devm function instead of driver remove
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux3.3Vendor (CNA)
Linux Linux3b4643ffaf72d7a5a357e9bf68b1775f8cfe7e77Vendor (CNA)
Linux Linux9eaec071f111cd2124ce9a5b93536d3f6837d457Vendor (CNA)
Linux Linuxad926f735b4d4f10768fec7d080cadeb6d075cacVendor (CNA)
Linux Linuxb0cca357f85beb6144ab60c62dcc98508cc044bfVendor (CNA)
Linux Linuxb479839525fe7906966cdc4b5b2afbca048558a1Vendor (CNA)
Linux Linuxc88f7328bb0fff66520fc9164f02b1d06e083c1bVendor (CNA)
Linux Linuxc98eb9ffb1d9c98237b5e1668eee17654e129fb0Vendor (CNA)
Linux Linuxcf30432f5b3064ff85d85639c2f0106f89c566f6Vendor (CNA)
Linux Linuxe6eff39dd0fe4190c6146069cc16d160e71d1148Vendor (CNA)
azl3 kernel 6.6.85.1-4 on Azure Linux 3.06.6.92.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 kernel 6.6.92.2-1 on Azure Linux 3.06.6.92.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.135-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (10 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records