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CVE-2024-26773 Siemens CVE debrief

This CVE addresses a vulnerability in the Linux kernel's ext4 filesystem, specifically within the `ext4_mb_try_best_found()` function. The issue involves improper block allocation from corrupted block groups, which could lead to filesystem instability or data integrity problems. The vulnerability was resolved by implementing checks to avoid allocating blocks from corrupted groups. Siemens has identified this CVE as affecting certain industrial networking products running SINEC OS, including the RUGGEDCOM RST2428P and SCALANCE X-family switches. CISA published this advisory on August 12, 2025, with subsequent updates through February 25, 2026, including corrections to affected product listings and removal of rejected CVEs. The advisory categorizes the impact as 'Misinformed' for the affected Siemens products. No CVSS score or severity rating is currently available in the source data.

Vendor
Siemens
Product
RUGGEDCOM RST2428P (6GK6242-6PA00)
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2025-08-12
Original CVE updated
2026-02-25
Advisory published
2025-08-12
Advisory updated
2026-02-25

Who should care

Organizations operating Siemens industrial networking infrastructure including RUGGEDCOM RST2428P switches and SCALANCE X-family managed switches. OT security teams responsible for maintaining SINEC OS deployments. Infrastructure operators relying on ext4 filesystems in embedded Linux systems within industrial environments.

Technical summary

The vulnerability exists in the ext4 filesystem implementation within the Linux kernel. The `ext4_mb_try_best_found()` function, part of the multiblock allocator, could attempt to allocate blocks from corrupted block groups. This flaw could result in allocation of unusable or inconsistent blocks, potentially causing filesystem errors, data corruption, or system instability. The fix implements validation to prevent allocation from groups marked as corrupted. Siemens industrial networking products utilizing SINEC OS incorporate the affected Linux kernel components and are consequently exposed to this vulnerability.

Defensive priority

medium

Recommended defensive actions

  • Review Siemens ProductCERT advisory SSA-613116 for detailed product-specific guidance and patch availability
  • Verify SINEC OS version on affected Siemens devices (RUGGEDCOM RST2428P, SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family, SCALANCE XCM-/XRM-/XCH-/XRH-300 family)
  • Apply vendor-provided firmware updates when available per Siemens security advisory
  • Monitor CISA ICS advisories for additional guidance on industrial control system security practices
  • Implement network segmentation for industrial control systems per CISA recommended practices
  • Ensure ext4 filesystem integrity checks are performed on affected Linux-based systems

Evidence notes

The vulnerability description is sourced from the Linux kernel commit message indicating a resolution to avoid allocating blocks from corrupted groups in ext4_mb_try_best_found(). Siemens ProductCERT advisory SSA-613116 is the authoritative source for product impact. CISA advisory ICSA-25-226-15 was initially published 2025-08-12 and most recently updated 2026-02-25 to reflect republication based on the Siemens advisory. The source explicitly marks impact as 'Misinformed' for affected product IDs CSAFPID-0001, CSAFPID-0003, and CSAFPID-0004. Revision history confirms corrections to affected product listings on 2026-02-12 and removal of rejected CVEs on 2026-02-24.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-26773 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-26773

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

  • CVE-2024-26773 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-26773

    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/2025/icsa-25-226-15.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-613116.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-613116.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-25-226-15

    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.