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PatchSiren cyber security CVE debrief

CVE-2024-26778 Siemens CVE debrief

A vulnerability in the Linux kernel's S3 Savage framebuffer driver (fbdev: savage) has been identified and resolved. The issue occurs when the pixclock parameter equals zero, which could lead to undefined behavior. The fix adds proper error handling to exit when this condition is detected. This vulnerability affects Siemens industrial networking products running SINEC OS, specifically the RUGGEDCOM RST2428P and SCALANCE X-family switches. The vulnerability was disclosed in CISA advisory ICSA-25-226-15, which was republished on February 25, 2026 based on Siemens ProductCERT advisory SSA-613116. The advisory's threat assessment categorizes the impact as 'Misinformed' for affected products.

Vendor
Siemens
Product
RUGGEDCOM RST2428P (6GK6242-6PA00)
CVSS
Unknown
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, particularly those with SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family switches, SCALANCE XCM-/XRM-/XCH-/XRH-300 family switches, or RUGGEDCOM RST2428P devices. OT security teams managing SINEC OS deployments should prioritize vendor guidance review.

Technical summary

The vulnerability exists in the fbdev: savage driver within the Linux kernel. When the pixclock (pixel clock) parameter is set to zero, the driver fails to properly validate this input, potentially leading to division by zero errors or other undefined behavior. The resolution adds an explicit error check that exits when pixclock equals zero. This affects Siemens industrial networking equipment running SINEC OS, including the RUGGEDCOM RST2428P and multiple SCALANCE switch families. The CISA advisory assessment indicates 'Misinformed' impact, suggesting limited practical exploitability under normal operational conditions.

Defensive priority

medium

Recommended defensive actions

  • Review Siemens ProductCERT advisory SSA-613116 for detailed product-specific guidance
  • Verify SINEC OS version on affected SCALANCE and RUGGEDCOM devices
  • Apply vendor-provided patches or updates as specified in Siemens security advisory
  • Monitor CISA ICS advisories for additional updates to ICSA-25-226-15
  • Implement network segmentation for industrial control systems per CISA recommended practices

Evidence notes

The vulnerability description indicates a kernel-level framebuffer driver issue where division by zero or undefined behavior could occur when pixclock equals zero. The CISA CSAF advisory ICSA-25-226-15 was initially published on August 12, 2025 and underwent multiple revisions, with the most recent republication on February 25, 2026. The advisory's threat section explicitly marks impact as 'Misinformed' for the three affected product IDs (CSAFPID-0001, CSAFPID-0004, CSAFPID-0003). Siemens ProductCERT advisory SSA-613116 serves as the canonical source for this vulnerability information.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-26778 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-26778

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

  • CVE-2024-26778 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-26778

    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.