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NVD / CVE Program· CNA Linux

CVE-2025-40067: fs/ntfs3: reject index allocation if $BITMAP is empty but blocks exist

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: 0.16% (FIRST EPSS).
  • Someone with local access to the system can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 039ddf353cc33f6546a87ec1ac3210637d714bec, 0dc7117da8f92dd5fe077d712a756eccbe377d40, 6.12.53.

Low priority for now. Upgrade to Linux Linux 039ddf353cc33f6546a87ec1ac3210637d714bec, 0dc7117da8f92dd5fe077d712a756eccbe377d40, 6.12.53 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: fs/ntfs3: reject index allocation if $BITMAP is empty but blocks exist Index allocation requires at least one bit in the $BITMAP attribute to track usage of index entries. If the bitmap is empty while index blocks are already present, this reflects on-disk corruption. syzbot triggered this condition using a malformed NTFS image. During a rename() operation involving a long filename (which spans multiple index entries), the empty bitmap allowed the name to be added without valid tracking. Subsequent deletion of the original entry failed with -ENOENT, due to unexpected index state. Reject such cases by verifying that the bitmap is not empty when index blocks exist.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Oct 28, 2025
Updated
Oct 30, 2026
EPSS
0.1% · 5th 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%

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
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  • 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.

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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

    • 358d4f821c03add421a4c49290538a705852ccf1, a285395020780adac1ffbc844069c3d700bf007a, 6.17affected
    • 47856e10f8d5e066aa26b1f9c02d933fe0620399 and later · before aab2e34b139f6df71ab2b1adeec9927c206adc79affected · git
    • b35a50d639ca5259466ef5fea85529bb4fb17d5b and later · before 978aac54e93ea35aab20b32ae393d3d33964e7aeaffected · git
    • 3ed2cc6a6e93fbeb8c0cafce1e7fb1f64a331dcc and later · before be66551da203862c689c12e1d35ce87217c017c1affected · git
    • d99208b91933fd2a58ed9ed321af07dacd06ddc3 and later · before 039ddf353cc33f6546a87ec1ac3210637d714becaffected · git
    • d99208b91933fd2a58ed9ed321af07dacd06ddc3 and later · before 0dc7117da8f92dd5fe077d712a756eccbe377d40affected · git
    • 6.6.102 and later · before 6.6.112affected · semver
    • 6.12.42 and later · before 6.12.53affected · semver
    • 6.15.10 and later · before 6.16affected · semver
    • 6.16.1 and later · before 6.17affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:13linuxbefore 6.12.57-16.12.57-1
Debian:14linuxbefore 6.17.6-16.17.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2025-40065Oct 28, 2025 · RISC-V: KVM: Write hgatp register with valid mode bits
    0Monitor
  • ← EarlierCVE-2025-40066Oct 28, 2025 · wifi: mt76: mt7996: Check phy before init msta_link in mt7996_mac_sta_add_links()
    0Monitor
  • Later →CVE-2025-40068Oct 28, 2025 · fs: ntfs3: Fix integer overflow in run_unpack()
    33Monitor

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 Linux039ddf353cc33f6546a87ec1ac3210637d714becVendor (CNA)
Linux Linux0dc7117da8f92dd5fe077d712a756eccbe377d40Vendor (CNA)
Linux Linux6.12.53Vendor (CNA)
Linux Linux6.16Vendor (CNA)
Linux Linux6.17Vendor (CNA)
Linux Linux6.6.112Vendor (CNA)
Linux Linux978aac54e93ea35aab20b32ae393d3d33964e7aeVendor (CNA)
Linux Linuxaab2e34b139f6df71ab2b1adeec9927c206adc79Vendor (CNA)
Linux Linuxbe66551da203862c689c12e1d35ce87217c017c1Vendor (CNA)
debian:linux6.12.57-1 · Debian:13Package 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.

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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.
  • No account or password is required.
  • A user must open a link or visit a page.
  • 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
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-secondary

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✗ → ✓

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References

Show all references (4 more)

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

All records