CVE-2025-40127

Driver initialization failure via uninitialized clock pointer

Published Nov 12, 2025 · Updated May 11, 2026

Division by zero in the ks-sa hardware RNG driver in affected Linux kernel releases interrupts driver initialization via unspecified vectors. The ks_sa_rng_init function passes an uninitialized clock pointer to clk_get_rate and divides by the resulting zero rate while calculating delay values. The condition requires a TI Keystone SA hardware RNG device, and published material identifies no attacker-controlled trigger or consequence beyond failed driver initialization.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Division by zero in the ks-sa hardware RNG driver in affected Linux kernel releases interrupts driver initialization via unspecified vectors. The ks_sa_rng_init function passes an uninitialized clock pointer to clk_get_rate and divides by the resulting zero rate while calculating delay values. The condition requires a TI Keystone SA hardware RNG device, and published material identifies no attacker-controlled trigger or consequence beyond failed driver initialization.

The record

CVE
CVE-2025-40127
Published
Nov 12, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Nov 12, 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=5.5
  2. Affected versionversion=6d01d8511dceb9cd40f72eb102b7d24f0b2e997b <2b6bcce32cb5aff84588a844a4d3f6dd5353b8e2
  3. Affected versionversion=6d01d8511dceb9cd40f72eb102b7d24f0b2e997b <55a70e1de75e5ff5f961c79a2cdc6a4468cc2bf2
  4. Affected versionversion=6d01d8511dceb9cd40f72eb102b7d24f0b2e997b <612b1dfeb414dfa780a6316014ceddf9a74ff5c0
  5. Affected versionversion=6d01d8511dceb9cd40f72eb102b7d24f0b2e997b <692a04a1e0cde1d80a33df0078c755cf02cd7268
  6. Affected versionversion=6d01d8511dceb9cd40f72eb102b7d24f0b2e997b <d76b099011fa056950f63d05ebb6160991242f6a
  7. Affected versionversion=6d01d8511dceb9cd40f72eb102b7d24f0b2e997b <eec7e0e19c1fa75dc65e25aa6a21ef24a03849af
  8. Affected versionversion=6d01d8511dceb9cd40f72eb102b7d24f0b2e997b <f4238064379a91e71a9c258996acac43c50c2094

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.5; version=6d01d8511dceb9cd40f72eb102b7d24f0b2e997b <2b6bcce32cb5aff84588a844a4d3f6dd5353b8e2; version=6d01d8511dceb9cd40f72eb102b7d24f0b2e997b <55a70e1de75e5ff5f961c79a2cdc6a4468cc2bf2; version=6d01d8511dceb9cd40f72eb102b7d24f0b2e997b <612b1dfeb414dfa780a6316014ceddf9a74ff5c0; version=6d01d8511dceb9cd40f72eb102b7d24f0b2e997b <692a04a1e0cde1d80a33df0078c755cf02cd7268; version=6d01d8511dceb9cd40f72eb102b7d24f0b2e997b <d76b099011fa056950f63d05ebb6160991242f6a; version=6d01d8511dceb9cd40f72eb102b7d24f0b2e997b <eec7e0e19c1fa75dc65e25aa6a21ef24a03849af; version=6d01d8511dceb9cd40f72eb102b7d24f0b2e997b <f4238064379a91e71a9c258996acac43c50c2094

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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