CVE-2024-49968

System reboot via invalid ext4 default hash

Published Oct 21, 2024 · Updated Sep 8, 2026

Linux kernel ext4 5.13 through affected stable releases allows local users to trigger a warning that reboots certain systems. During __ext4_fill_super(), ext4 accepts a superblock whose default directory hash is DX_HASH_SIPHASH even though casefold is absent, rather than rejecting the mount. Mounting the malformed filesystem requires elevated privileges; warning-triggered panic interrupts the host or embedded controller subsystem.

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

Linux kernel ext4 5.13 through affected stable releases allows local users to trigger a warning that reboots certain systems. During __ext4_fill_super(), ext4 accepts a superblock whose default directory hash is DX_HASH_SIPHASH even though casefold is absent, rather than rejecting the mount. Mounting the malformed filesystem requires elevated privileges; warning-triggered panic interrupts the host or embedded controller subsystem.

The record

CVE
CVE-2024-49968
Published
Oct 21, 2024
Updated
Sep 8, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-20, T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Oct 21, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 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=V3.1.6 <*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Siemens · SIPLUS S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.6 <*
The Linux Kernel Organization · Linuxversion=471fbbea7ff7061b2d6474665cb5a2ceb4fd6500 <11bd1c279bac701ba91119875796ffff3b98250e; version=471fbbea7ff7061b2d6474665cb5a2ceb4fd6500 <52c4538a92da6f3242d4140c03ddc5ee71b39ba8; version=471fbbea7ff7061b2d6474665cb5a2ceb4fd6500 <86b81d4eab1cd4c56f7447896232cf33472c2395; version=471fbbea7ff7061b2d6474665cb5a2ceb4fd6500 <985b67cd86392310d9e9326de941c22fc9340eec; version=471fbbea7ff7061b2d6474665cb5a2ceb4fd6500 <e1373903db6c4ac994de0d18076280ad88e12dee; version=5.13
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPversion=V3.1.6 <*
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.6 <*

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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