CVE-2024-50195

PTP disruption via unchecked clock values

Published Nov 8, 2024 · Updated Aug 5, 2026

Improper input validation in the Linux kernel allows local users to disrupt PTP time services through an invalid clock setting. The pc_clock_settime() path passes negative tv_sec or out-of-range tv_nsec values to PTP driver settime64 callbacks without strict validation. Exploitation requires write access to a /dev/ptpN device and can poison the interface clock, interrupting hardware timestamps, synchronization, and time-aware transmission.

CVSS severity7.1
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in the Linux kernel allows local users to disrupt PTP time services through an invalid clock setting. The pc_clock_settime() path passes negative tv_sec or out-of-range tv_nsec values to PTP driver settime64 callbacks without strict validation. Exploitation requires write access to a /dev/ptpN device and can poison the interface clock, interrupting hardware timestamps, synchronization, and time-aware transmission.

The record

CVE
CVE-2024-50195
Published
Nov 8, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-754
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 8, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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?

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  1. Affected versionversion=0606f422b453f76c31ab2b1bd52943ff06a2dcf2 <1ff7247101af723731ea42ed565d54fb8f341264
  2. Affected versionversion=0606f422b453f76c31ab2b1bd52943ff06a2dcf2 <27abbde44b6e71ee3891de13e1a228aa7ce95bfe
  3. Affected versionversion=0606f422b453f76c31ab2b1bd52943ff06a2dcf2 <29f085345cde24566efb751f39e5d367c381c584
  4. Affected versionversion=0606f422b453f76c31ab2b1bd52943ff06a2dcf2 <673a1c5a2998acbd429d6286e6cad10f17f4f073
  5. Affected versionversion=0606f422b453f76c31ab2b1bd52943ff06a2dcf2 <a3f169e398215e71361774d13bf91a0101283ac2
  6. Affected versionversion=0606f422b453f76c31ab2b1bd52943ff06a2dcf2 <c8789fbe2bbf75845e45302cba6ffa44e1884d01
  7. Affected versionversion=0606f422b453f76c31ab2b1bd52943ff06a2dcf2 <d8794ac20a299b647ba9958f6d657051fc51a540
  8. Affected versionversion=0606f422b453f76c31ab2b1bd52943ff06a2dcf2 <e0c966bd3e31911b57ef76cec4c5796ebd88e512
  9. Affected versionversion=2.6.39

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0606f422b453f76c31ab2b1bd52943ff06a2dcf2 <1ff7247101af723731ea42ed565d54fb8f341264; version=0606f422b453f76c31ab2b1bd52943ff06a2dcf2 <27abbde44b6e71ee3891de13e1a228aa7ce95bfe; version=0606f422b453f76c31ab2b1bd52943ff06a2dcf2 <29f085345cde24566efb751f39e5d367c381c584; version=0606f422b453f76c31ab2b1bd52943ff06a2dcf2 <673a1c5a2998acbd429d6286e6cad10f17f4f073; version=0606f422b453f76c31ab2b1bd52943ff06a2dcf2 <a3f169e398215e71361774d13bf91a0101283ac2; version=0606f422b453f76c31ab2b1bd52943ff06a2dcf2 <c8789fbe2bbf75845e45302cba6ffa44e1884d01; version=0606f422b453f76c31ab2b1bd52943ff06a2dcf2 <d8794ac20a299b647ba9958f6d657051fc51a540; version=0606f422b453f76c31ab2b1bd52943ff06a2dcf2 <e0c966bd3e31911b57ef76cec4c5796ebd88e512; version=2.6.39

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.1Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
5.5CISA-ADPCVSS: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

CWE-754Improper Check for Unusual or Exceptional Conditions

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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