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CVE-2025-39730· NVD / CVE Program· CNA Linux

NFS: Fix filehandle bounds checking in nfs_fh_to_dentry()

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: 0.19% (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 12ad3def2e5e0b120e3d0cb6ce8b7b796819ad40, 2ad40b7992aa26bc631afc1a995b0e3ddc30de3f, 3570ef5c31314c13274c935a20b91768ab5bf412; azl3 kernel 6.6.96.2-2 on Azure Linux 3.0 6.6.104.2-1; cbl2 kernel 5.15.186.1-1 on CBL Mariner 2.0 5.15.200.1-1.

Low priority for now. Upgrade to Linux Linux 12ad3def2e5e0b120e3d0cb6ce8b7b796819ad40, 2ad40b7992aa26bc631afc1a995b0e3ddc30de3f, 3570ef5c31314c13274c935a20b91768ab5bf412; azl3 kernel 6.6.96.2-2 on Azure Linux 3.0 6.6.104.2-1; cbl2 kernel 5.15.186.1-1 on CBL Mariner 2.0 5.15.200.1-1 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: NFS: Fix filehandle bounds checking in nfs_fh_to_dentry() The function needs to check the minimal filehandle length before it can access the embedded filehandle.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Sep 7, 2025
Updated
Jun 17, 2026
EPSS
0.1% · 8th 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%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

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-2025-39730

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 6.1.148
  • linux linux kernel4.13 and later · before 5.4.297
  • linux linux kernel6.7 and later · before 6.12.42
  • linux linux kernel6.13 and later · before 6.15.10
  • linux linux kernel6.16 and later · before 6.16.1
  • linux linux kernel6.2 and later · before 6.6.102

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

    • 4.13affected
    • 20fa19027286983ab2734b5910c4a687436e0c31 and later · before 7f8eca87fef7519e9c41f3258f25ebc2752247eeaffected · git
    • 20fa19027286983ab2734b5910c4a687436e0c31 and later · before cb09afa0948d96b1e385d609ed044bb1aa043536affected · git
    • 20fa19027286983ab2734b5910c4a687436e0c31 and later · before 3570ef5c31314c13274c935a20b91768ab5bf412affected · git
    • 20fa19027286983ab2734b5910c4a687436e0c31 and later · before 763810bb883cb4de412a72f338d80947d97df67baffected · git
    • 20fa19027286983ab2734b5910c4a687436e0c31 and later · before 12ad3def2e5e0b120e3d0cb6ce8b7b796819ad40affected · git
    • 20fa19027286983ab2734b5910c4a687436e0c31 and later · before 2ad40b7992aa26bc631afc1a995b0e3ddc30de3faffected · git
    • 20fa19027286983ab2734b5910c4a687436e0c31 and later · before b7f7866932466332a2528fda099000b035303485affected · git
    • 20fa19027286983ab2734b5910c4a687436e0c31 and later · before 7dd36f7477d1e03a1fcf8d13531ca326c4fb599faffected · git
    • 20fa19027286983ab2734b5910c4a687436e0c31 and later · before ef93a685e01a281b5e2a25ce4e3428cf9371a205affected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-124.13.1.el10_16.12.0-124.13.1.el10_1
AlmaLinux:10kernel-docbefore 6.12.0-124.13.1.el10_16.12.0-124.13.1.el10_1
AlmaLinux:8bpftoolbefore 4.18.0-553.78.1.el8_104.18.0-553.78.1.el8_10
AlmaLinux:8kernelbefore 4.18.0-553.78.1.el8_104.18.0-553.78.1.el8_10
AlmaLinux:8kernel-abi-stablelistsbefore 4.18.0-553.78.1.el8_104.18.0-553.78.1.el8_10
AlmaLinux:8kernel-corebefore 4.18.0-553.78.1.el8_104.18.0-553.78.1.el8_10
AlmaLinux:8kernel-cross-headersbefore 4.18.0-553.78.1.el8_104.18.0-553.78.1.el8_10
AlmaLinux:8kernel-debugbefore 4.18.0-553.78.1.el8_104.18.0-553.78.1.el8_10
AlmaLinux:8kernel-debug-corebefore 4.18.0-553.78.1.el8_104.18.0-553.78.1.el8_10
AlmaLinux:8kernel-debug-develbefore 4.18.0-553.78.1.el8_104.18.0-553.78.1.el8_10
AlmaLinux:8kernel-debug-modulesbefore 4.18.0-553.78.1.el8_104.18.0-553.78.1.el8_10
AlmaLinux:8kernel-debug-modules-extrabefore 4.18.0-553.78.1.el8_104.18.0-553.78.1.el8_10
AlmaLinux:8kernel-develbefore 4.18.0-553.78.1.el8_104.18.0-553.78.1.el8_10
AlmaLinux:8kernel-docbefore 4.18.0-553.78.1.el8_104.18.0-553.78.1.el8_10
AlmaLinux:8kernel-headersbefore 4.18.0-553.78.1.el8_104.18.0-553.78.1.el8_10
AlmaLinux:8kernel-modulesbefore 4.18.0-553.78.1.el8_104.18.0-553.78.1.el8_10
AlmaLinux:8kernel-modules-extrabefore 4.18.0-553.78.1.el8_104.18.0-553.78.1.el8_10
AlmaLinux:8kernel-rtbefore 4.18.0-553.78.1.rt7.419.el8_104.18.0-553.78.1.rt7.419.el8_10
AlmaLinux:8kernel-rt-corebefore 4.18.0-553.78.1.rt7.419.el8_104.18.0-553.78.1.rt7.419.el8_10
AlmaLinux:8kernel-rt-debugbefore 4.18.0-553.78.1.rt7.419.el8_104.18.0-553.78.1.rt7.419.el8_10
AlmaLinux:8kernel-rt-debug-corebefore 4.18.0-553.78.1.rt7.419.el8_104.18.0-553.78.1.rt7.419.el8_10
AlmaLinux:8kernel-rt-debug-develbefore 4.18.0-553.78.1.rt7.419.el8_104.18.0-553.78.1.rt7.419.el8_10
AlmaLinux:8kernel-rt-debug-modulesbefore 4.18.0-553.78.1.rt7.419.el8_104.18.0-553.78.1.rt7.419.el8_10
AlmaLinux:8kernel-rt-debug-modules-extrabefore 4.18.0-553.78.1.rt7.419.el8_104.18.0-553.78.1.rt7.419.el8_10

+96

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-2025-39727Sep 7, 2025 · mm: swap: fix potential buffer overflow in setup_clusters()
    31Monitor
  • ← EarlierCVE-2025-39729Sep 7, 2025 · crypto: ccp - Fix dereferencing uninitialized error pointer
    22Monitor
  • Later →CVE-2025-39731Sep 7, 2025 · f2fs: vm_unmap_ram() may be called from an invalid context
    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 Linux12ad3def2e5e0b120e3d0cb6ce8b7b796819ad40Vendor (CNA)
Linux Linux2ad40b7992aa26bc631afc1a995b0e3ddc30de3fVendor (CNA)
Linux Linux3570ef5c31314c13274c935a20b91768ab5bf412Vendor (CNA)
Linux Linux763810bb883cb4de412a72f338d80947d97df67bVendor (CNA)
Linux Linux7dd36f7477d1e03a1fcf8d13531ca326c4fb599fVendor (CNA)
Linux Linux7f8eca87fef7519e9c41f3258f25ebc2752247eeVendor (CNA)
Linux Linuxb7f7866932466332a2528fda099000b035303485Vendor (CNA)
Linux Linuxcb09afa0948d96b1e385d609ed044bb1aa043536Vendor (CNA)
Linux Linuxef93a685e01a281b5e2a25ce4e3428cf9371a205Vendor (CNA)
azl3 kernel 6.6.96.2-2 on Azure Linux 3.06.6.104.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.186.1-1 on CBL Mariner 2.05.15.200.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:bpftool4.18.0-553.78.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel4.18.0-553.78.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-abi-stablelists4.18.0-553.78.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-core4.18.0-553.78.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-cross-headers4.18.0-553.78.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug4.18.0-553.78.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-core4.18.0-553.78.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-devel4.18.0-553.78.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-modules4.18.0-553.78.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-modules-extra4.18.0-553.78.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-devel4.18.0-553.78.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-doc4.18.0-553.78.1.el8_10 · AlmaLinux:8Package registry (OSV)
debian:linux6.1.148-1 · Debian:12Package registry (OSV)
red hat:bpftool0:4.18.0-553.78.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:bpftool-debuginfo0:4.18.0-553.78.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel0:4.18.0-553.78.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-abi-stablelists0:4.18.0-553.78.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-core0:4.18.0-553.78.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug0:4.18.0-553.78.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)

+7

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 (10 more)

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

All records