CVE-2026-23374

Kernel BUG via preemptible per-CPU access

Published Mar 25, 2026 · Updated Mar 25, 2026

A preemption-context error in Linux Kernel blktrace allows local users to trigger a kernel BUG through block-trace activity. __blk_add_trace() calls tracing_record_cmdline() before ring-buffer reservation disables preemption, causing unsafe per-CPU reads and writes while the task remains preemptible. The condition requires block tracing on a preemptible kernel; it corrupts trace command-line state and produces a BUG warning, while system interruption depends on kernel warning policy.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A preemption-context error in Linux Kernel blktrace allows local users to trigger a kernel BUG through block-trace activity. __blk_add_trace() calls tracing_record_cmdline() before ring-buffer reservation disables preemption, causing unsafe per-CPU reads and writes while the task remains preemptible. The condition requires block tracing on a preemptible kernel; it corrupts trace command-line state and produces a BUG warning, while system interruption depends on kernel warning policy.

The record

CVE
CVE-2026-23374
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 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=3.8
  2. Affected versionversion=7ffbd48d5cab22bcd1120eb2349db1319e2d827a <59efa088752b1c380a0475974679850cc8aef907
  3. Affected versionversion=7ffbd48d5cab22bcd1120eb2349db1319e2d827a <da46b5dfef48658d03347cda21532bcdbb521e67

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.8; version=7ffbd48d5cab22bcd1120eb2349db1319e2d827a <59efa088752b1c380a0475974679850cc8aef907; version=7ffbd48d5cab22bcd1120eb2349db1319e2d827a <da46b5dfef48658d03347cda21532bcdbb521e67

Published CVSS scores

5.5NIST NVDCVSS: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.

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application 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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