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NVD / CVE Program· CNA Linux

CVE-2025-40087: NFSD: Define a proc_layoutcommit for the FlexFiles layout type

Noroxi assessment

Priority: Monitor (action score 30/100)

  • 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: 0.49% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 34d187e020cbda112a6c6f094f0ca5e6a8672b75, 4b47a8601b71ad98833b447d465592d847b4dc77, 785ec512afa80d0540f2ca797c0e56de747a6083; azl3 kernel 6.6.112.1-2 on Azure Linux 3.0 6.6.117.1-1.

Low priority for now. Upgrade to Linux Linux 34d187e020cbda112a6c6f094f0ca5e6a8672b75, 4b47a8601b71ad98833b447d465592d847b4dc77, 785ec512afa80d0540f2ca797c0e56de747a6083; azl3 kernel 6.6.112.1-2 on Azure Linux 3.0 6.6.117.1-1 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: NFSD: Define a proc_layoutcommit for the FlexFiles layout type Avoid a crash if a pNFS client should happen to send a LAYOUTCOMMIT operation on a FlexFiles layout.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Oct 30, 2025
Updated
Oct 19, 2026
EPSS
0.4% · 42th percentile
CWE
—

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CNA vs NVD score

NVD
—
CNA · Linux
7.5
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.

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-2025-40087

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.

—

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

    • 4.8affected
    • 9b9960a0ca4773e21c4b153ed355583946346b25 and later · before a75994dd879401c3e24ff51c2536559f1a53ea27affected · git
    • 9b9960a0ca4773e21c4b153ed355583946346b25 and later · before 34d187e020cbda112a6c6f094f0ca5e6a8672b75affected · git
    • 9b9960a0ca4773e21c4b153ed355583946346b25 and later · before ba88a53d7f5df4191583abf214214efe0cda91d2affected · git
    • 9b9960a0ca4773e21c4b153ed355583946346b25 and later · before da9129ef77786839a3ccd1d7afeeab790bceaa1daffected · git
    • 9b9960a0ca4773e21c4b153ed355583946346b25 and later · before f7353208c91ab004e0179c5fb6c365b0f132f9f0affected · git
    • 9b9960a0ca4773e21c4b153ed355583946346b25 and later · before a156af6a4dc38c2aa7c98e89520a70fb3b3e7df4affected · git
    • 9b9960a0ca4773e21c4b153ed355583946346b25 and later · before 785ec512afa80d0540f2ca797c0e56de747a6083affected · git
    • 9b9960a0ca4773e21c4b153ed355583946346b25 and later · before 4b47a8601b71ad98833b447d465592d847b4dc77affected · git
    • before 4.8not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.158-16.1.158-1
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-2025-40085Oct 29, 2025 · ALSA: usb-audio: Fix NULL pointer deference in try_to_register_card
    0Monitor
  • ← EarlierCVE-2025-40086Oct 30, 2025 · drm/xe: Don't allow evicting of BOs in same VM in array of VM binds
    0Monitor
  • Later →CVE-2025-40088Oct 30, 2025 · hfsplus: fix slab-out-of-bounds read in hfsplus_strcasecmp()
    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 Linux34d187e020cbda112a6c6f094f0ca5e6a8672b75Vendor (CNA)
Linux Linux4b47a8601b71ad98833b447d465592d847b4dc77Vendor (CNA)
Linux Linux785ec512afa80d0540f2ca797c0e56de747a6083Vendor (CNA)
Linux Linuxa156af6a4dc38c2aa7c98e89520a70fb3b3e7df4Vendor (CNA)
Linux Linuxa75994dd879401c3e24ff51c2536559f1a53ea27Vendor (CNA)
Linux Linuxba88a53d7f5df4191583abf214214efe0cda91d2Vendor (CNA)
Linux Linuxda9129ef77786839a3ccd1d7afeeab790bceaa1dVendor (CNA)
Linux Linuxf7353208c91ab004e0179c5fb6c365b0f132f9f0Vendor (CNA)
azl3 kernel 6.6.112.1-2 on Azure Linux 3.06.6.117.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.158-1 · 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

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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✗ → ✓

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

References

Show all references (7 more)

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

All records