CVE-2024-26645

Kernel warning via tracing_map write reordering

Published Mar 26, 2024 · Updated May 11, 2026

Race condition in the Linux kernel tracing_map implementation allows local users to trigger duplicate histogram entries and a kernel warning. In __tracing_map_insert(), the key copy and entry pointer publication can become visible in reverse order on another CPU, so a concurrent lookup compares an incompletely published key and inserts a duplicate. Reproduction requires writable tracefs controls and concurrent workload execution on a multiprocessor AArch64 system; the demonstrated consequence is a kernel warning.

CVSS severity4.4
Medium
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

Race condition in the Linux kernel tracing_map implementation allows local users to trigger duplicate histogram entries and a kernel warning. In __tracing_map_insert(), the key copy and entry pointer publication can become visible in reverse order on another CPU, so a concurrent lookup compares an incompletely published key and inserts a duplicate. Reproduction requires writable tracefs controls and concurrent workload execution on a multiprocessor AArch64 system; the demonstrated consequence is a kernel warning.

The record

CVE
CVE-2024-26645
Published
Mar 26, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Mar 26, 2024CVE 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=4.17
  2. Affected versionversion=c193707dde77ace92a649cd59a17e105e2fbeaef <2b44760609e9eaafc9d234a6883d042fc21132a7
  3. Affected versionversion=c193707dde77ace92a649cd59a17e105e2fbeaef <5022b331c041e8c54b9a6a3251579bd1e8c0fc0b
  4. Affected versionversion=c193707dde77ace92a649cd59a17e105e2fbeaef <a1eebe76e187dbe11ca299f8dbb6e45d5b1889e7
  5. Affected versionversion=c193707dde77ace92a649cd59a17e105e2fbeaef <aef1cb00856ccfd614467cfb50b791278992e177
  6. Affected versionversion=c193707dde77ace92a649cd59a17e105e2fbeaef <bf4aeff7da85c3becd39fb73bac94122331c30fb
  7. Affected versionversion=c193707dde77ace92a649cd59a17e105e2fbeaef <dad9b28f675ed99b4dec261db2a397efeb80b74c
  8. Affected versionversion=c193707dde77ace92a649cd59a17e105e2fbeaef <ef70dfa0b1e5084f32635156c9a5c795352ad860
  9. Affected versionversion=c193707dde77ace92a649cd59a17e105e2fbeaef <f4f7e696db0274ff560482cc52eddbf0551d4b7a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=4.17; version=c193707dde77ace92a649cd59a17e105e2fbeaef <2b44760609e9eaafc9d234a6883d042fc21132a7; version=c193707dde77ace92a649cd59a17e105e2fbeaef <5022b331c041e8c54b9a6a3251579bd1e8c0fc0b; version=c193707dde77ace92a649cd59a17e105e2fbeaef <a1eebe76e187dbe11ca299f8dbb6e45d5b1889e7; version=c193707dde77ace92a649cd59a17e105e2fbeaef <aef1cb00856ccfd614467cfb50b791278992e177; version=c193707dde77ace92a649cd59a17e105e2fbeaef <bf4aeff7da85c3becd39fb73bac94122331c30fb; version=c193707dde77ace92a649cd59a17e105e2fbeaef <dad9b28f675ed99b4dec261db2a397efeb80b74c; version=c193707dde77ace92a649cd59a17e105e2fbeaef <ef70dfa0b1e5084f32635156c9a5c795352ad860; version=c193707dde77ace92a649cd59a17e105e2fbeaef <f4f7e696db0274ff560482cc52eddbf0551d4b7a

Published CVSS scores

4.4OracleCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
4.4Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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