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NVD / CVE Program· CNA Linux

CVE-2025-21742: usbnet: ipheth: use static NDP16 location in URB

Noroxi assessment

Priority: Monitor (action score 28/100)

  • 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: 0.22% (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 2b619445dcb6dab97d8ed033fb57225aca1288c4, 86586dcb75cb8fd062a518aca8ee667938b91efb, 8fb062178e1ce180e2cfdc9abc83a1b9fea381ca; azl3 kernel 6.6.64.2-9 on Azure Linux 3.0 6.6.78.1-1; azl3 kernel 6.6.78.1-1 on Azure Linux 3.0 6.6.78.1-1.

Low priority for now. Upgrade to Linux Linux 2b619445dcb6dab97d8ed033fb57225aca1288c4, 86586dcb75cb8fd062a518aca8ee667938b91efb, 8fb062178e1ce180e2cfdc9abc83a1b9fea381ca; azl3 kernel 6.6.64.2-9 on Azure Linux 3.0 6.6.78.1-1; azl3 kernel 6.6.78.1-1 on Azure Linux 3.0 6.6.78.1-1 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: usbnet: ipheth: use static NDP16 location in URB Original code allowed for the start of NDP16 to be anywhere within the URB based on the `wNdpIndex` value in NTH16. Only the start position of NDP16 was checked, so it was possible for even the fixed-length part of NDP16 to extend past the end of URB, leading to an out-of-bounds read. On iOS devices, the NDP16 header always directly follows NTH16. Rely on and check for this specific format. This, along with NCM-specific minimal URB length check that already exists, will ensure that the fixed-length part of NDP16 plus a set amount of DPEs fit within the URB. Note that this commit alone does not fully address the OoB read. The limit on the amount of DPEs needs to be enforced separately.

HighCVSS 7.1 · v3.1—No exploit Fix available
Published
Feb 26, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 12th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

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-2025-21742

When you'll hear from us

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  • 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.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel6.5 and later · before 6.6.78
  • linux linux kernel6.7 and later · before 6.12.14
  • linux linux kernel6.13 and later · before 6.13.3

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

    • 6.5affected
    • a2d274c62e44b1995c170595db3865c6fe701226 and later · before 8fb062178e1ce180e2cfdc9abc83a1b9fea381caaffected · git
    • a2d274c62e44b1995c170595db3865c6fe701226 and later · before cf1ac7f7cf601ac31d1580559c002b5e37b733b7affected · git
    • a2d274c62e44b1995c170595db3865c6fe701226 and later · before 2b619445dcb6dab97d8ed033fb57225aca1288c4affected · git
    • a2d274c62e44b1995c170595db3865c6fe701226 and later · before 86586dcb75cb8fd062a518aca8ee667938b91efbaffected · git
    • before 6.5not affected · semver
    • 6.6.78 and later · up to and including 6.6.*not affected · semver
    • 6.12.14 and later · up to and including 6.12.*not affected · semver
    • 6.13.3 and later · up to and including 6.13.*not affected · semver
    • 6.14 and laternot affected · original_commit_for_fix

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:13linuxbefore 6.12.15-16.12.15-1

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-2025-21739Feb 26, 2025 · scsi: ufs: core: Fix use-after free in init error and remove paths
    31Monitor
  • ← EarlierCVE-2025-21741Feb 26, 2025 · usbnet: ipheth: fix DPE OoB read
    28Monitor
  • Later →CVE-2025-21743Feb 26, 2025 · usbnet: ipheth: fix possible overflow in DPE length check
    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 Linux2b619445dcb6dab97d8ed033fb57225aca1288c4Vendor (CNA)
Linux Linux86586dcb75cb8fd062a518aca8ee667938b91efbVendor (CNA)
Linux Linux8fb062178e1ce180e2cfdc9abc83a1b9fea381caVendor (CNA)
Linux Linuxcf1ac7f7cf601ac31d1580559c002b5e37b733b7Vendor (CNA)
azl3 kernel 6.6.64.2-9 on Azure Linux 3.06.6.78.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 kernel 6.6.78.1-1 on Azure Linux 3.06.6.78.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.12.15-1 · 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.

—

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
none
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
None
Availability impact
High

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

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

References

Show all references (3 more)

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

All records