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PatchSiren cyber security CVE debrief

CVE-2024-53239 Siemens CVE debrief

CVE-2024-53239 is a use-after-free (UAF) vulnerability in the Linux ALSA 6fire USB audio driver. The flaw occurs when the driver attempts to release resources immediately after calling usb6fire_chip_abort(), while the card object may still be in use via snd_card_free_when_closed(). This timing window creates a potential UAF condition. The vulnerability was published on 2025-08-12 and last modified on 2026-02-25. Siemens ProductCERT issued advisory SSA-355557 addressing this issue, and CISA republished the advisory as ICSA-25-226-07. The vulnerability affects Siemens industrial networking products that incorporate the vulnerable Linux kernel component, including RUGGEDCOM RST2428P and SCALANCE X-family switches running SINEC OS. No CVSS score or severity rating is available in the source corpus. The vulnerability is not listed in CISA's Known Exploited Vulnerabilities (KEV) catalog.

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 SCALANCE or RUGGEDCOM industrial Ethernet switches, particularly those deployed in critical infrastructure environments. Security teams responsible for OT/ICS asset management and patch coordination. System integrators and operators of industrial networks using SINEC OS-based devices.

Technical summary

The vulnerability exists in the ALSA 6fire driver's resource cleanup path. When usb6fire_chip_abort() is called, the driver proceeds to release resources immediately. However, because snd_card_free_when_closed() is used for card object management, the card object may still be referenced elsewhere at the time of resource release. This race condition results in a use-after-free vulnerability. The issue affects Siemens industrial networking products that incorporate the vulnerable kernel code, including SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family, SCALANCE XCM-/XRM-/XCH-/XRH-300 family, and RUGGEDCOM RST2428P switches. The CISA advisory was updated on 2026-02-25 to clarify affected configurations and remove rejected CVEs from the advisory.

Defensive priority

medium

Recommended defensive actions

  • Review Siemens ProductCERT advisory SSA-355557 for detailed product impact and patch availability
  • Apply vendor-provided firmware updates for affected SCALANCE and RUGGEDCOM products when available
  • Monitor CISA ICS advisory ICSA-25-226-07 for updates on affected product configurations
  • Implement network segmentation for industrial control systems per CISA recommended practices
  • Assess exposure of affected devices to determine prioritization for patching efforts

Evidence notes

The vulnerability description is sourced from CISA CSAF advisory ICSA-25-226-07, which references Siemens ProductCERT advisory SSA-355557. The threat category in the source is marked as 'Misinformed' for affected product IDs CSAFPID-0006, CSAFPID-0002, and CSAFPID-0003. The source corpus does not contain CVSS scoring information or evidence of active exploitation.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-53239 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-53239

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

  • CVE-2024-53239 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-53239

    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.