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PatchSiren cyber security CVE debrief

CVE-2024-47707 Siemens CVE debrief

A NULL pointer dereference vulnerability exists in the Linux kernel's IPv6 routing subsystem within the rt6_uncached_list_flush_dev() function. The vulnerability stems from a missing NULL check that was inadvertently removed by a previous commit, potentially allowing a local attacker to trigger a denial of service condition. The vulnerability affects Siemens SIMATIC S7-1500 TM MFP industrial control systems through their GNU/Linux subsystem.

Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2023-12-12
Original CVE updated
2025-08-12
Advisory published
2023-12-12
Advisory updated
2025-08-12

Who should care

Organizations operating Siemens SIMATIC S7-1500 TM MFP industrial control systems with the GNU/Linux subsystem enabled should prioritize this vulnerability. System administrators responsible for OT/ICS environments, security teams managing industrial networks, and personnel with interactive shell access to affected devices should be aware of this issue. The vulnerability is particularly relevant for environments where multiple users or applications have access to the Linux subsystem on these industrial controllers.

Technical summary

The vulnerability exists in the rt6_uncached_list_flush_dev() function in the Linux kernel's IPv6 implementation. This function is responsible for flushing uncached IPv6 routing entries associated with a network device when that device is being removed or reconfigured. A previous commit removed a necessary NULL pointer check, creating conditions where a NULL dereference can occur. This is classified as CWE-476 (NULL Pointer Dereference). The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) indicates a local attack vector with low attack complexity, requiring low privileges and resulting in high availability impact through denial of service. No confidentiality or integrity impacts are associated with this vulnerability.

Defensive priority

medium

Recommended defensive actions

  • Limit access to the interactive shell of the GNU/Linux subsystem to trusted personnel only
  • Only build and run applications from trusted sources
  • Monitor for availability impacts on affected systems
  • Apply vendor patches when released by Siemens
  • Review network segmentation to limit exposure of affected industrial control systems

Evidence notes

The vulnerability description indicates this is a regression bug where a necessary NULL check was removed by a previous commit in the Linux kernel IPv6 routing code. The rt6_uncached_list_flush_dev() function is part of the IPv6 uncached route handling, which manages temporary routing entries that are not stored in the main routing cache.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-47707 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-47707

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2024-47707 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-47707

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2024/icsa-24-102-01.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-265688.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-265688.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-24-102-01

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-alerts/ics-alert-10-301-01

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/resources-tools/resources/ics-recommended-practices

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/topics/industrial-control-systems

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf

    Reference

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.