CVE-2025-40298

Local kernel crash via missing PTP callback

Published Dec 8, 2025 · Updated May 11, 2026

NULL pointer dereference in the GVE PTP driver in Linux 6.17 through 6.17.7 allows local users to crash the kernel through a set-time request. The ptp_clock_settime() path calls the driver's absent settime64 callback, dereferencing a NULL function pointer instead of returning an unsupported-operation error. A local user must reach the GVE precision-time clock interface; successful triggering interrupts the host by crashing the kernel.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the GVE PTP driver in Linux 6.17 through 6.17.7 allows local users to crash the kernel through a set-time request. The ptp_clock_settime() path calls the driver's absent settime64 callback, dereferencing a NULL function pointer instead of returning an unsupported-operation error. A local user must reach the GVE precision-time clock interface; successful triggering interrupts the host by crashing the kernel.

The record

CVE
CVE-2025-40298
Published
Dec 8, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 8, 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

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Is a vulnerable build present?

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

  1. Affected versionversion=6.17
  2. Affected versionversion=acd16380523b400400523fe54c7499320e558e80 <329d050bbe63c2999f657cf2d3855be11a473745
  3. Affected versionversion=acd16380523b400400523fe54c7499320e558e80 <c9efb03ff4fae0bc7e5ef3323c3aab599cb4c88a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.17; version=acd16380523b400400523fe54c7499320e558e80 <329d050bbe63c2999f657cf2d3855be11a473745; version=acd16380523b400400523fe54c7499320e558e80 <c9efb03ff4fae0bc7e5ef3323c3aab599cb4c88a

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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

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Your stack

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