CVE-2025-40299

Kernel crash via missing PTP callback

Published Dec 8, 2025 · Updated May 11, 2026

NULL pointer dereference in the Linux kernel gve PTP driver 6.17 through 6.17.7 allows local users to crash the system. The driver's ptp_clock_info omits both gettimex64 and gettime64, while ptp_clock_gettime() and ptp_sys_offset() assume that one callback exists. Reaching the fault requires the affected gve PTP implementation and a call through its time-query path; the reported consequence is a kernel crash.

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 Linux kernel gve PTP driver 6.17 through 6.17.7 allows local users to crash the system. The driver's ptp_clock_info omits both gettimex64 and gettime64, while ptp_clock_gettime() and ptp_sys_offset() assume that one callback exists. Reaching the fault requires the affected gve PTP implementation and a call through its time-query path; the reported consequence is a kernel crash.

The record

CVE
CVE-2025-40299
Published
Dec 8, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
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 <6ab753b5d8e521616cd9bd10b09891cbeb7e0235
  3. Affected versionversion=acd16380523b400400523fe54c7499320e558e80 <96ec90412ceb58c73fd3714e40ab2cee1eedac3b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.17; version=acd16380523b400400523fe54c7499320e558e80 <6ab753b5d8e521616cd9bd10b09891cbeb7e0235; version=acd16380523b400400523fe54c7499320e558e80 <96ec90412ceb58c73fd3714e40ab2cee1eedac3b

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 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

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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