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NVD / CVE Program· CNA Linux

CVE-2025-39798: NFS: Fix the setting of capabilities when automounting a new filesystem

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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: 0.27% (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.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Linux Linux 175afda783e38c0660f2afc0602dd9c83d4e7ee1, 3924dab90816d0c683a110628ef386f83a9d1e13, 50e0fd0050e510e749e1fdd1d7158e419ff8f3b9; 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 175afda783e38c0660f2afc0602dd9c83d4e7ee1, 3924dab90816d0c683a110628ef386f83a9d1e13, 50e0fd0050e510e749e1fdd1d7158e419ff8f3b9; 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 the setting of capabilities when automounting a new filesystem Capabilities cannot be inherited when we cross into a new filesystem. They need to be reset to the minimal defaults, and then probed for again.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Sep 12, 2025
Updated
Oct 19, 2026
EPSS
0.2% · 20th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.5
CNA · Linux
7.3
1.8 point gap

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

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-2025-39798

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 kernel2.6.19 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

    • 2.6.19affected
    • 54ceac4515986030c2502960be620198dd8fe25b and later · before 95eb0d97ab98a10e966125c1f274e7d0fc0992b3affected · git
    • 54ceac4515986030c2502960be620198dd8fe25b and later · before 73fcb101bb3eb2a552d7856a476b2c0bc3b5ef9eaffected · git
    • 54ceac4515986030c2502960be620198dd8fe25b and later · before 3924dab90816d0c683a110628ef386f83a9d1e13affected · git
    • 54ceac4515986030c2502960be620198dd8fe25b and later · before 175afda783e38c0660f2afc0602dd9c83d4e7ee1affected · git
    • 54ceac4515986030c2502960be620198dd8fe25b and later · before 987c20428f067c1c7f29ed0a2bd8c63fa74b1c2caffected · git
    • 54ceac4515986030c2502960be620198dd8fe25b and later · before 816a6f60c2c2b679a33fa4276442bafd11473651affected · git
    • 54ceac4515986030c2502960be620198dd8fe25b and later · before a8ffee4abd8ec9d7a64d394e0306ae64ba139fd2affected · git
    • 54ceac4515986030c2502960be620198dd8fe25b and later · before 50e0fd0050e510e749e1fdd1d7158e419ff8f3b9affected · git
    • 54ceac4515986030c2502960be620198dd8fe25b and later · before b01f21cacde9f2878492cf318fee61bf4ccad323affected · 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-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-2025-39796Sep 12, 2025 · net: lapbether: ignore ops-locked netdevs
    31Monitor
  • ← EarlierCVE-2025-39797Sep 12, 2025 · xfrm: Duplicate SPI Handling
    31Monitor
  • Later →CVE-2022-50234Sep 15, 2025 · io_uring/af_unix: defer registered files gc to io_uring release
    31Monitor

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 Linux175afda783e38c0660f2afc0602dd9c83d4e7ee1Vendor (CNA)
Linux Linux3924dab90816d0c683a110628ef386f83a9d1e13Vendor (CNA)
Linux Linux50e0fd0050e510e749e1fdd1d7158e419ff8f3b9Vendor (CNA)
Linux Linux73fcb101bb3eb2a552d7856a476b2c0bc3b5ef9eVendor (CNA)
Linux Linux816a6f60c2c2b679a33fa4276442bafd11473651Vendor (CNA)
Linux Linux95eb0d97ab98a10e966125c1f274e7d0fc0992b3Vendor (CNA)
Linux Linux987c20428f067c1c7f29ed0a2bd8c63fa74b1c2cVendor (CNA)
Linux Linuxa8ffee4abd8ec9d7a64d394e0306ae64ba139fd2Vendor (CNA)
Linux Linuxb01f21cacde9f2878492cf318fee61bf4ccad323Vendor (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)
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.

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

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 (12 more)

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

All records