CVE-2025-40147

Kernel crash via blk-throttle activation race

Published Nov 12, 2025 · Updated May 11, 2026

NULL pointer dereference in Linux kernel 6.10 allows attackers to crash the kernel when block throttling races cold-boot initialization. blk_throtl_activated() treats a non-NULL q->td as sufficient before the queue policy bit and throttle-group data are attached, so blk_should_throtl() dereferences a NULL group. The observed gate is repeated cold boot with throttling consulted during early queue setup; published evidence demonstrates no attacker control beyond a system crash.

CVSS severityUnavailable
Unscored
EPSS probability0.24%
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 Linux kernel 6.10 allows attackers to crash the kernel when block throttling races cold-boot initialization. blk_throtl_activated() treats a non-NULL q->td as sufficient before the queue policy bit and throttle-group data are attached, so blk_should_throtl() dereferences a NULL group. The observed gate is repeated cold boot with throttling consulted during early queue setup; published evidence demonstrates no attacker control beyond a system crash.

The record

CVE
CVE-2025-40147
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=6.10
  2. Affected versionversion=a3166c51702bb00b8f8b84022090cbab8f37be1a <6a0c394300a7b0c05504596685de8a46707171fc
  3. Affected versionversion=a3166c51702bb00b8f8b84022090cbab8f37be1a <7b4bfd02c934dbbb18814ed012ecb90b58db6935
  4. Affected versionversion=a3166c51702bb00b8f8b84022090cbab8f37be1a <bd9fd5be6bc0836820500f68fff144609fbd85a9

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=6.10; version=a3166c51702bb00b8f8b84022090cbab8f37be1a <6a0c394300a7b0c05504596685de8a46707171fc; version=a3166c51702bb00b8f8b84022090cbab8f37be1a <7b4bfd02c934dbbb18814ed012ecb90b58db6935; version=a3166c51702bb00b8f8b84022090cbab8f37be1a <bd9fd5be6bc0836820500f68fff144609fbd85a9

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

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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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