CVE-2025-38126

Kernel crash via zero PTP clock rate

Published Jul 3, 2025 · Updated May 11, 2026

Divide by zero in the stmmac PTP timestamping path of affected Linux kernel releases allows local users to crash the kernel. stmmac_init_tstamp_counter divides by clk_ptp_rate after some platform drivers retain a zero rate returned by clk_get_rate from device-tree clock data. Reachability requires a stmmac device whose driver does not override that zero rate and local ability to bring the interface up; the demonstrated consequence is an availability-only kernel exception.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Divide by zero in the stmmac PTP timestamping path of affected Linux kernel releases allows local users to crash the kernel. stmmac_init_tstamp_counter divides by clk_ptp_rate after some platform drivers retain a zero rate returned by clk_get_rate from device-tree clock data. Reachability requires a stmmac device whose driver does not override that zero rate and local ability to bring the interface up; the demonstrated consequence is an availability-only kernel exception.

The record

CVE
CVE-2025-38126
Published
Jul 3, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-369, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 3, 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=19d857c9038e5c07db8f8cc02b5ad0cd0098714f <030ce919e114a111e83b7976ecb3597cefd33f26
  2. Affected versionversion=19d857c9038e5c07db8f8cc02b5ad0cd0098714f <32af9c289234990752281c805500dfe03c5b2b8f
  3. Affected versionversion=19d857c9038e5c07db8f8cc02b5ad0cd0098714f <379cd990dfe752b38fcf46034698a9a150626c7a
  4. Affected versionversion=19d857c9038e5c07db8f8cc02b5ad0cd0098714f <b263088ee8ab14563817a8be3519af8e25225793
  5. Affected versionversion=19d857c9038e5c07db8f8cc02b5ad0cd0098714f <bb033c6781ce1b0264c3993b767b4aa9021959c2
  6. Affected versionversion=4.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=19d857c9038e5c07db8f8cc02b5ad0cd0098714f <030ce919e114a111e83b7976ecb3597cefd33f26; version=19d857c9038e5c07db8f8cc02b5ad0cd0098714f <32af9c289234990752281c805500dfe03c5b2b8f; version=19d857c9038e5c07db8f8cc02b5ad0cd0098714f <379cd990dfe752b38fcf46034698a9a150626c7a; version=19d857c9038e5c07db8f8cc02b5ad0cd0098714f <b263088ee8ab14563817a8be3519af8e25225793; version=19d857c9038e5c07db8f8cc02b5ad0cd0098714f <bb033c6781ce1b0264c3993b767b4aa9021959c2; version=4.5

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7SUSECVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
5.7SUSECVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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

CWE-369Divide By Zero
T1499.004Application or System Exploitation

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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