CVE-2024-47706

Local system crash via stale BFQ queue pointer

Published Oct 21, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux kernel BFQ I/O scheduler allows local users to crash the system through crafted block I/O. During a multi-queue merge chain, bfq_insert_request wrongly assigns the originating bfq_io_cq to an intermediate bfq_queue, leaving bfqq->bic stale after that context is freed. Exploitation requires low-privileged local access, BFQ on a block device, and the merge-chain I/O pattern; the bounded result is a kernel crash.

CVSS severity5.5
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

Use-after-free in the Linux kernel BFQ I/O scheduler allows local users to crash the system through crafted block I/O. During a multi-queue merge chain, bfq_insert_request wrongly assigns the originating bfq_io_cq to an intermediate bfq_queue, leaving bfqq->bic stale after that context is freed. Exploitation requires low-privileged local access, BFQ on a block device, and the merge-chain I/O pattern; the bounded result is a kernel crash.

The record

CVE
CVE-2024-47706
Published
Oct 21, 2024
Updated
Aug 5, 2026
Vendor
Siemens
Product
SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family
Classifications
CWE-416
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 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

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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=0 <V3.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 familyversion=0 <V3.2
Siemens · SIMATIC S7-1500 TM MFP - GNU/Linux subsystemversion=0 <*
The Linux Kernel Organization · Linuxversion=36eca894832351feed9072d0f97eb06fc9482ca4 <18ad4df091dd5d067d2faa8fce1180b79f7041a7; version=36eca894832351feed9072d0f97eb06fc9482ca4 <6d130db286ad0ea392c96ebb2551acf0d7308048; version=36eca894832351feed9072d0f97eb06fc9482ca4 <7faed2896d78e48ec96229e73b30b0af6c00a9aa; version=36eca894832351feed9072d0f97eb06fc9482ca4 <880692ee233ba63808182705b3333403413b58f5; version=36eca894832351feed9072d0f97eb06fc9482ca4 <8aa9de02a4be2e7006e636816ce19b0d667ceaa3; version=36eca894832351feed9072d0f97eb06fc9482ca4 <a9bdd5b36887d2bacb8bc777fd18317c99fc2587; version=36eca894832351feed9072d0f97eb06fc9482ca4 <bc2140534b2aae752e4f7cb4489642dbb5ec4777; version=36eca894832351feed9072d0f97eb06fc9482ca4 <ddbdaad123254fb53e32480cb74a486a6868b1e0; version=36eca894832351feed9072d0f97eb06fc9482ca4 <e1277ae780cca4e69ef5468d4582dfd48f0b8320; version=4.12
Siemens · SCALANCE XCM/XRM/XCH/XRH-300 familyversion=0 <V3.2
Siemens · RUGGEDCOM RST2428Pversion=0 <V3.2

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.

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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

CWE-416Use After Free

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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