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CVE-2025-39743· NVD / CVE Program· CNA Linux

jfs: truncate good inode pages when hard link is 0

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: 0.18% (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 1bb5cdc3e39f0c2b311fcb631258b7e60d3fb0d3, 2b1d5ca395a5fb170c3f885cd42c16179f7f54ec, 2d91b3765cd05016335cd5df5e5c6a29708ec058.

Low priority for now. Upgrade to Linux Linux 1bb5cdc3e39f0c2b311fcb631258b7e60d3fb0d3, 2b1d5ca395a5fb170c3f885cd42c16179f7f54ec, 2d91b3765cd05016335cd5df5e5c6a29708ec058 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: jfs: truncate good inode pages when hard link is 0 The fileset value of the inode copy from the disk by the reproducer is AGGR_RESERVED_I. When executing evict, its hard link number is 0, so its inode pages are not truncated. This causes the bugon to be triggered when executing clear_inode() because nrpages is greater than 0.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Sep 11, 2025
Updated
Oct 19, 2026
EPSS
0.1% · 7th 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 · 0.1%

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-2025-39743

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 5.10.241
  • linux linux kernel5.11 and later · before 5.15.190
  • linux linux kernel5.16 and later · before 6.1.149
  • linux linux kernel2.6.14 and later · before 5.4.297
  • linux linux kernel6.7 and later · before 6.12.43
  • linux linux kernel6.13 and later · before 6.15.11
  • linux linux kernel6.16 and later · before 6.16.2
  • linux linux kernel6.2 and later · before 6.6.103

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

    • 2.6.14affected
    • 32983696a48a6c41d99f3eca82ba7510a552d843 and later · before 89fff8e3d6710fc32507b8e19eb5afa9fb79b896affected · git
    • 32983696a48a6c41d99f3eca82ba7510a552d843 and later · before 5845b926c561b8333cd65169526eec357d7bb449affected · git
    • 32983696a48a6c41d99f3eca82ba7510a552d843 and later · before 8ed7275910fb7177012619864e04d3008763f3eaaffected · git
    • 32983696a48a6c41d99f3eca82ba7510a552d843 and later · before b5b471820c33365a8ccd2d463578bf4e47056c2caffected · git
    • 32983696a48a6c41d99f3eca82ba7510a552d843 and later · before 34d8e982bac48bdcca7524644a8825a580edce74affected · git
    • 32983696a48a6c41d99f3eca82ba7510a552d843 and later · before df3fd8daf278eca365f221749ae5b728e8382a04affected · git
    • 32983696a48a6c41d99f3eca82ba7510a552d843 and later · before 2b1d5ca395a5fb170c3f885cd42c16179f7f54ecaffected · git
    • 32983696a48a6c41d99f3eca82ba7510a552d843 and later · before 1bb5cdc3e39f0c2b311fcb631258b7e60d3fb0d3affected · git
    • 32983696a48a6c41d99f3eca82ba7510a552d843 and later · before 2d91b3765cd05016335cd5df5e5c6a29708ec058affected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.153-16.1.153-1
Debian:13linuxbefore 6.12.43-16.12.43-1
Debian:14linuxbefore 6.16.3-16.16.3-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • 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
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2025-39741Sep 11, 2025 · drm/xe/migrate: don't overflow max copy size
    22Monitor
  • ← EarlierCVE-2025-39742Sep 11, 2025 · RDMA: hfi1: fix possible divide-by-zero in find_hw_thread_mask()
    22Monitor
  • Later →CVE-2025-39744Sep 11, 2025 · rcu: Fix rcu_read_unlock() deadloop due to IRQ work
    28Monitor

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 Linux1bb5cdc3e39f0c2b311fcb631258b7e60d3fb0d3Vendor (CNA)
Linux Linux2b1d5ca395a5fb170c3f885cd42c16179f7f54ecVendor (CNA)
Linux Linux2d91b3765cd05016335cd5df5e5c6a29708ec058Vendor (CNA)
Linux Linux34d8e982bac48bdcca7524644a8825a580edce74Vendor (CNA)
Linux Linux5845b926c561b8333cd65169526eec357d7bb449Vendor (CNA)
Linux Linux89fff8e3d6710fc32507b8e19eb5afa9fb79b896Vendor (CNA)
Linux Linux8ed7275910fb7177012619864e04d3008763f3eaVendor (CNA)
Linux Linuxb5b471820c33365a8ccd2d463578bf4e47056c2cVendor (CNA)
Linux Linuxdf3fd8daf278eca365f221749ae5b728e8382a04Vendor (CNA)
debian:linux6.1.153-1 · 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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. Fix✗ → ✓

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

References

Show all references (11 more)

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

All records