CVE-2025-21742

Kernel memory disclosure and crash via NDP16 offset

Published Feb 27, 2025 · Updated May 11, 2026

An out-of-bounds read in the ipheth USB network driver in Linux allows local users to read kernel memory via a crafted NDP16 header. The receive path trusted NTH16's wNdpIndex after checking only the NDP16 start, allowing the fixed-length header to extend beyond the URB. Reachability requires ipheth processing of USB-network data from a connected iOS device; successful exploitation exposes memory or interrupts the host.

CVSS severity7.1
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds read in the ipheth USB network driver in Linux allows local users to read kernel memory via a crafted NDP16 header. The receive path trusted NTH16's wNdpIndex after checking only the NDP16 start, allowing the fixed-length header to extend beyond the URB. Reachability requires ipheth processing of USB-network data from a connected iOS device; successful exploitation exposes memory or interrupts the host.

The record

CVE
CVE-2025-21742
Published
Feb 27, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 27, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.5
  2. Affected versionversion=a2d274c62e44b1995c170595db3865c6fe701226 <2b619445dcb6dab97d8ed033fb57225aca1288c4
  3. Affected versionversion=a2d274c62e44b1995c170595db3865c6fe701226 <86586dcb75cb8fd062a518aca8ee667938b91efb
  4. Affected versionversion=a2d274c62e44b1995c170595db3865c6fe701226 <8fb062178e1ce180e2cfdc9abc83a1b9fea381ca
  5. Affected versionversion=a2d274c62e44b1995c170595db3865c6fe701226 <cf1ac7f7cf601ac31d1580559c002b5e37b733b7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.5; version=a2d274c62e44b1995c170595db3865c6fe701226 <2b619445dcb6dab97d8ed033fb57225aca1288c4; version=a2d274c62e44b1995c170595db3865c6fe701226 <86586dcb75cb8fd062a518aca8ee667938b91efb; version=a2d274c62e44b1995c170595db3865c6fe701226 <8fb062178e1ce180e2cfdc9abc83a1b9fea381ca; version=a2d274c62e44b1995c170595db3865c6fe701226 <cf1ac7f7cf601ac31d1580559c002b5e37b733b7

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.1CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

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