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CVE-2024-56596 Siemens CVE debrief

CVE-2024-56596 describes an array-index-out-of-bounds condition in the Journaled File System (jfs) within the Linux kernel, specifically in the jfs_readdir function. The vulnerability stems from invalid values in the stbl (slot table) structure that could lead to out-of-bounds memory access. A fix was implemented to add validation checks that return an error code when invalid stbl values are detected. This vulnerability was published on 2025-08-12 and last modified on 2026-02-25. The issue affects Siemens industrial networking products running SINEC OS, which incorporates the vulnerable Linux kernel component. CISA republished this advisory on 2026-02-25 based on updates from Siemens ProductCERT advisory SSA-355557. Notably, the threat assessment for this CVE is marked as 'Misinformed' in the source advisory, indicating potential discrepancies in initial reporting or impact assessment. The vulnerability is not listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, and no known ransomware campaign use has been documented.

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 equipment including RUGGEDCOM RST2428P and SCALANCE X-family switches running SINEC OS; OT security teams managing Linux-based industrial control systems; infrastructure operators utilizing jfs filesystems in embedded or industrial environments.

Technical summary

The vulnerability exists in the jfs_readdir function of the Linux Journaled File System (jfs). The stbl (slot table) structure may contain invalid values that, when processed, result in an array-index-out-of-bounds condition. The remediation adds input validation to detect invalid stbl values and return an appropriate error code rather than proceeding with unsafe memory access. This is a classic bounds-checking deficiency in filesystem directory iteration code.

Defensive priority

medium

Recommended defensive actions

  • Review Siemens ProductCERT advisory SSA-355557 for detailed product impact and patch availability
  • Verify SINEC OS and underlying Linux kernel versions on affected Siemens industrial networking equipment
  • Apply kernel updates or vendor-provided patches that address the jfs_readdir validation fix
  • Monitor CISA ICS advisories for updates to ICSA-25-226-07
  • Implement defense-in-depth strategies for industrial control systems per CISA recommended practices

Evidence notes

Source advisory ICSA-25-226-07 published by CISA on 2025-08-12; last republished 2026-02-25 based on Siemens ProductCERT SSA-355557. Threat category marked 'Misinformed' per source. Not in CISA KEV.

Official resources

2025-08-12