CVE-2024-26855

Kernel crash via unchecked bridge attribute

Published Apr 17, 2024 · Updated May 12, 2026

A NULL pointer dereference in affected Linux kernel versions starting at 4.20 allows local users to crash the system through a bridge setlink request. The ice_bridge_setlink function passes a missing AF_SPEC bridge attribute from nlmsg_find_attr into nla_for_each_nested and dereferences the null br_spec pointer. Exploitation requires low-privileged local access to reach the ice network-driver path, and the documented consequence is a kernel crash without data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A NULL pointer dereference in affected Linux kernel versions starting at 4.20 allows local users to crash the system through a bridge setlink request. The ice_bridge_setlink function passes a missing AF_SPEC bridge attribute from nlmsg_find_attr into nla_for_each_nested and dereferences the null br_spec pointer. Exploitation requires low-privileged local access to reach the ice network-driver path, and the documented consequence is a kernel crash without data disclosure or modification.

The record

CVE
CVE-2024-26855
Published
Apr 17, 2024
Updated
May 12, 2026
Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classifications
CWE-476, CWE-20, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 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=4.20; version=b1edc14a3fbfe0154a2aecb8bb9775c3012cb6e2 <06e456a05d669ca30b224b8ed962421770c1496c; version=b1edc14a3fbfe0154a2aecb8bb9775c3012cb6e2 <0e296067ae0d74a10b4933601f9aa9f0ec8f157f; version=b1edc14a3fbfe0154a2aecb8bb9775c3012cb6e2 <1a770927dc1d642b22417c3e668c871689fc58b3; version=b1edc14a3fbfe0154a2aecb8bb9775c3012cb6e2 <37fe99016b12d32100ce670216816dba6c48b309; version=b1edc14a3fbfe0154a2aecb8bb9775c3012cb6e2 <8d95465d9a424200485792858c5b3be54658ce19; version=b1edc14a3fbfe0154a2aecb8bb9775c3012cb6e2 <afdd29726a6de4ba27cd15590661424c888dc596; version=b1edc14a3fbfe0154a2aecb8bb9775c3012cb6e2 <d9fefc51133107e59d192d773be86c1150cfeebb

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

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-476NULL Pointer Dereference
CWE-20Improper Input Validation
T1499.004Application or System Exploitation

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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