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.

Official resources

2025-08-12