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CVE-2024-49882 Siemens CVE debrief

CVE-2024-49882 is a medium-severity vulnerability (CVSS 5.5) in the Linux ext4 filesystem, specifically within the ext4_ext_try_to_merge_up() function. The issue involves a double-free condition where path[1].p_bh is not set to NULL after being released, potentially allowing the same buffer header to be freed twice. This vulnerability was published on 2025-08-12 and last modified on 2026-02-25. Siemens has identified this vulnerability as affecting multiple industrial networking products including the RUGGEDCOM RST2428P, SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family, and SCALANCE XCM-/XRM-/XCH-/XRH-300 family. The vulnerability requires local access with low privileges to exploit, and successful exploitation could result in high availability impact. Siemens has released vendor fixes, with updates to V3.2 or later versions recommended for affected products.

Vendor
Siemens
Product
RUGGEDCOM RST2428P (6GK6242-6PA00)
CVSS
MEDIUM 5.5
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 RUGGEDCOM RST2428P, SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500, or SCALANCE XCM-/XRM-/XCH-/XRH-300 industrial networking equipment. OT security teams, infrastructure operators in critical manufacturing, energy, and transportation sectors, and patch management teams responsible for industrial control system maintenance.

Technical summary

The vulnerability exists in the ext4 filesystem's extent handling code. In ext4_ext_try_to_merge_up(), after path[1].p_bh is released via brelse(), the pointer is not subsequently set to NULL. This can lead to a double-free scenario if the same path structure is processed again, as the stale pointer may be passed to brelse() a second time. The vulnerability is classified as CWE-20 (Improper Input Validation) and has a CVSS 3.1 score of 5.5 (MEDIUM). Attack vector is local (AV:L) with low attack complexity (AC:L) and low privileges required (PR:L), resulting in high availability impact (A:H) with no confidentiality or integrity impact.

Defensive priority

medium

Recommended defensive actions

  • Apply vendor-provided updates to V3.2 or later version for affected Siemens RUGGEDCOM and SCALANCE products per vendor guidance
  • Review Siemens ProductCERT advisory SSA-355557 for specific product configuration guidance
  • Implement defense-in-depth strategies for industrial control systems per CISA recommended practices
  • Monitor for additional vendor communications regarding affected product configurations
  • Validate patch deployment through standard change management procedures for OT environments

Evidence notes

Vulnerability description and affected products confirmed through CISA CSAF advisory ICSA-25-226-07, which references Siemens ProductCERT advisory SSA-355557. CVSS vector AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H indicates local attack vector with high availability impact. Remediation guidance specifies vendor fixes available through Siemens support portal.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-49882 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-49882

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

  • CVE-2024-49882 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-49882

    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-25-226-07.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-355557.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-355557.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-25-226-07

    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.