PatchSiren cyber security CVE debrief

CVE-2023-52509 Siemens CVE debrief

This CVE addresses a use-after-free vulnerability in the ravb (Renesas Ethernet AVB) driver within the Linux kernel, specifically in the ravb_tx_timeout_work() function. The vulnerability was resolved in the Linux kernel, and Siemens has assessed its impact on industrial networking products running SINEC OS. According to CISA's ICS advisory ICSA-25-226-15 (published 2025-08-12, updated 2026-02-25), Siemens has marked the threat impact as 'Misinformed' for affected product lines including the RUGGEDCOM RST2428P and SCALANCE XCM-/XRM-/XCH-/XRH-300 family, indicating the vulnerability's applicability or severity may have been initially misunderstood or overstated. The advisory underwent multiple revisions, with the most recent update on 2026-02-25 reflecting changes based on Siemens ProductCERT SSA-613116. No CVSS score is currently assigned in the source data.

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 switches and SCALANCE XCM-/XRM-/XCH-/XRH-300 family devices running SINEC OS. OT security teams managing Ethernet AVB implementations in industrial environments should monitor vendor guidance given the 'Misinformed' impact assessment.

Technical summary

The vulnerability exists in the ravb_tx_timeout_work() function of the Renesas Ethernet AVB (Audio Video Bridging) driver in the Linux kernel. A use-after-free condition can occur when the transmit timeout work handler accesses memory that has already been freed. This type of vulnerability typically arises from race conditions between timeout handling and device teardown or reset operations. The fix involves proper synchronization or reference counting to prevent access to freed memory structures.

Defensive priority

medium

Recommended defensive actions

Review Siemens ProductCERT advisory SSA-613116 for detailed product impact assessment
Verify SINEC OS version on affected Siemens industrial networking equipment
Apply kernel updates from Siemens as specified in vendor 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

Source: CISA CSAF advisory ICSA-25-226-15. Threat category marked as 'Misinformed' per source threats data. Multiple advisory revisions tracked from initial publication through 2026-02-25.

Official resources

2025-08-12