CVE-2024-40925

Host crash via uninitialized block request list

Published Jul 12, 2024 · Updated Aug 5, 2026

Memory corruption in the Linux kernel 6.6 block flush path allows local users to crash or hang the host through batched I/O. The PREFLUSH/POSTFLUSH state machine passes an uninitialized rq->queuelist from __blk_mq_alloc_requests_batch() to list_move_tail(), corrupting list pointers. An unprivileged local user needs io_uring access, a writable block-backed file, and a suitable write-cache queue; the corruption can expose cross-I/O data, misdirect writes, or stop the host.

CVSS severity7.8
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in the Linux kernel 6.6 block flush path allows local users to crash or hang the host through batched I/O. The PREFLUSH/POSTFLUSH state machine passes an uninitialized rq->queuelist from __blk_mq_alloc_requests_batch() to list_move_tail(), corrupting list pointers. An unprivileged local user needs io_uring access, a writable block-backed file, and a suitable write-cache queue; the corruption can expose cross-I/O data, misdirect writes, or stop the host.

The record

CVE
CVE-2024-40925
Published
Jul 12, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.6
  2. Affected versionversion=81ada09cc25e4bf2de7d2951925fb409338a545d <87907bd69721a8506618a954d41a1de3040e88aa
  3. Affected versionversion=81ada09cc25e4bf2de7d2951925fb409338a545d <d0321c812d89c5910d8da8e4b10c891c6b96ff70
  4. Affected versionversion=81ada09cc25e4bf2de7d2951925fb409338a545d <fe1e395563ccb051e9dbd8fa99859f5caaad2e71

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.6; version=81ada09cc25e4bf2de7d2951925fb409338a545d <87907bd69721a8506618a954d41a1de3040e88aa; version=81ada09cc25e4bf2de7d2951925fb409338a545d <d0321c812d89c5910d8da8e4b10c891c6b96ff70; version=81ada09cc25e4bf2de7d2951925fb409338a545d <fe1e395563ccb051e9dbd8fa99859f5caaad2e71

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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