CVE-2024-43855

Local storage hang via non-atomic I/O accounting

Published Aug 17, 2024 · Updated May 23, 2026

Deadlock in the md subsystem of affected Linux kernel releases allows local users to hang storage I/O during array suspension. In drivers/md/md.c, submit_flushes decrements active_io before md_submit_flush_data runs, after which the worker increments it again and creates a circular wait with mddev_suspend. Triggering the condition requires local low-privileged access, concurrent flush traffic, and md array suspension; the resulting deadlock blocks I/O.

CVSS severity5.5
Medium
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

Deadlock in the md subsystem of affected Linux kernel releases allows local users to hang storage I/O during array suspension. In drivers/md/md.c, submit_flushes decrements active_io before md_submit_flush_data runs, after which the worker increments it again and creates a circular wait with mddev_suspend. Triggering the condition requires local low-privileged access, concurrent flush traffic, and md array suspension; the resulting deadlock blocks I/O.

The record

CVE
CVE-2024-43855
Published
Aug 17, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 17, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=530cec617f5a8ba6f26bcbf0d64d75c951d17730 <2d0738a8322bf4e5bfe693d16b3111928a9ccfbf
  2. Affected versionversion=6.1.75 <6.1.103
  3. Affected versionversion=6.6.14 <6.6.44
  4. Affected versionversion=6.7.2 <6.8
  5. Affected versionversion=6.8
  6. Affected versionversion=c4c2345214b66e2505a26fd2ea58839dd7a1d48d
  7. Affected versionversion=f9f2d957a8ea93c73182aebf7de30935a58c027d <32226070813140234b6c507084738e8e8385c5c6
  8. Affected versionversion=fa2bbff7b0b4e211fec5e5686ef96350690597b5 <611d5cbc0b35a752e657a83eebadf40d814d006b
  9. Affected versionversion=fa2bbff7b0b4e211fec5e5686ef96350690597b5 <ca963eefbc3331222b6121baa696d49ba2008811

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=530cec617f5a8ba6f26bcbf0d64d75c951d17730 <2d0738a8322bf4e5bfe693d16b3111928a9ccfbf; version=6.1.75 <6.1.103; version=6.6.14 <6.6.44; version=6.7.2 <6.8; version=6.8; version=c4c2345214b66e2505a26fd2ea58839dd7a1d48d; version=f9f2d957a8ea93c73182aebf7de30935a58c027d <32226070813140234b6c507084738e8e8385c5c6; version=fa2bbff7b0b4e211fec5e5686ef96350690597b5 <611d5cbc0b35a752e657a83eebadf40d814d006b; version=fa2bbff7b0b4e211fec5e5686ef96350690597b5 <ca963eefbc3331222b6121baa696d49ba2008811

Published CVSS scores

5.5UbuntuCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
T1499Endpoint Denial of Service

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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