CVE-2024-35805

System lockup via nonpreemptible exception cleanup loop

Published May 17, 2024 · Updated May 12, 2026

Improper locking in Linux dm-snapshot allows local users to hang Linux systems during snapshot removal with many stored exceptions. The dm_exception_table_exit function frees every stored exception in one uninterrupted loop, omitting a scheduling point when the table contains many entries. A local user must be able to create and remove a device-mapper snapshot; CPU starvation can lock up Linux and the SIMATIC S7-1500 TM MFP GNU/Linux subsystem.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in Linux dm-snapshot allows local users to hang Linux systems during snapshot removal with many stored exceptions. The dm_exception_table_exit function frees every stored exception in one uninterrupted loop, omitting a scheduling point when the table contains many entries. A local user must be able to create and remove a device-mapper snapshot; CPU starvation can lock up Linux and the SIMATIC S7-1500 TM MFP GNU/Linux subsystem.

The record

CVE
CVE-2024-35805
Published
May 17, 2024
Updated
May 12, 2026
Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classifications
CWE-667, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 17, 2024CVE publishedPublication date reported by the CVE source.
  2. May 12, 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 <*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SIMATIC S7-1500 TM MFP - GNU/Linux subsystemversion=0 <*
The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <116562e804ffc9dc600adab6326dde31d72262c7; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3d47eb405781cc5127deca9a14e24b27696087a1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5f4ad4d0b0943296287313db60b3f84df4aad683; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6e7132ed3c07bd8a6ce3db4bb307ef2852b322dc; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9759ff196e7d248bcf8386a7451d6ff8537a7d9c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e50f83061ac250f90710757a3e51b70a200835e2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e7d4cff57c3c43fdd72342c78d4138f509c7416e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fa5c055800a7fd49a36bbb52593aca4ea986a366; version=2.6.12

Published CVSS scores

5.5Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST National Vulnerability DatabaseCVSS: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 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
T1499.004Application 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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