CVE-2024-49889

Freed-memory access via stale ext4 extent path

Published Oct 21, 2024 · Updated Aug 5, 2026

A use-after-free in Linux ext4 allows attackers to trigger a stale-path dereference during EXT_DEBUG diagnostic output. ext4_split_extent and ext4_ext_handle_unwritten_extents retain a path pointer after ext4_find_extent can free or reallocate it, then pass the stale pointer to ext4_ext_show_leaf. The code is reachable only in kernels built with EXT_DEBUG, and the defect does not affect normal functionality.

CVSS severity7.8
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A use-after-free in Linux ext4 allows attackers to trigger a stale-path dereference during EXT_DEBUG diagnostic output. ext4_split_extent and ext4_ext_handle_unwritten_extents retain a path pointer after ext4_find_extent can free or reallocate it, then pass the stale pointer to ext4_ext_show_leaf. The code is reachable only in kernels built with EXT_DEBUG, and the defect does not affect normal functionality.

The record

CVE
CVE-2024-49889
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=3.18; version=dfe5080939ea4686b3414b5d970a9b26733c57a4 <2eba3b0cc5b8de624918d21f32b5b8db59a90b39; version=dfe5080939ea4686b3414b5d970a9b26733c57a4 <34b2096380ba475771971a778a478661a791aa15; version=dfe5080939ea4686b3414b5d970a9b26733c57a4 <4999fed877bb64e3e7f9ab9996de2ca983c41928; version=dfe5080939ea4686b3414b5d970a9b26733c57a4 <4e2524ba2ca5f54bdbb9e5153bea00421ef653f5; version=dfe5080939ea4686b3414b5d970a9b26733c57a4 <8b114f2cc7dd5d36729d040b68432fbd0f0a8868; version=dfe5080939ea4686b3414b5d970a9b26733c57a4 <b0cb4561fc4284d04e69c8a66c8504928ab2484e; version=dfe5080939ea4686b3414b5d970a9b26733c57a4 <d483c7cc1796bd6a80e7b3a8fd494996260f6b67
Siemens · SCALANCE XCM/XRM/XCH/XRH-300 familyversion=0 <V3.2
Siemens · RUGGEDCOM RST2428Pversion=0 <V3.2

Published CVSS scores

7.8Siemens ProductCERTCVSS: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

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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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