PatchSiren cyber security CVE debrief

CVE-2024-40988 Siemens CVE debrief

CVE-2024-40988 describes a UBSAN (Undefined Behavior Sanitizer) warning in the Linux kernel's drm/radeon driver, specifically in kv_dpm.c. The vulnerability was published on 2025-08-12 and last modified on 2026-02-25. CISA's ICS advisory ICSA-25-226-07, which was republished on 2026-02-25 based on Siemens ProductCERT advisory SSA-355557, identifies this CVE as affecting Siemens industrial networking products running SINEC OS, including the RUGGEDCOM RST2428P and SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family devices. However, the advisory's threat assessment categorizes the impact as 'Misinformed,' suggesting the vulnerability's practical security impact on these products may be limited or incorrectly characterized in initial assessments. The CVE originates from the Linux kernel's Radeon graphics driver, which is a third-party component incorporated into Siemens' SINEC OS. No CVSS score or severity rating is currently assigned. Organizations should consult Siemens' official security advisory for product-specific impact determination and patch availability.

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 RUGGEDCOM RST2428P, SCALANCE XC/XR/XCM/XRM/XCH/XRH series switches, or other SINEC OS-based industrial networking equipment should monitor this advisory. Security teams in OT/ICS environments should coordinate with Siemens support to determine actual product impact given the 'Misinformed' threat assessment. Linux kernel maintainers and distributors should address the underlying UBSAN condition in drm/radeon driver updates.

Technical summary

CVE-2024-40988 is a UBSAN (Undefined Behavior Sanitizer) warning in the kv_dpm.c file of the Linux kernel's drm/radeon driver, which handles power management for AMD Radeon graphics hardware. The vulnerability was identified in the Linux kernel and subsequently affects Siemens industrial networking products that incorporate the kernel as a third-party component within SINEC OS. The specific UBSAN warning suggests potential undefined behavior in the kernel's dynamic power management code for Radeon 'KV' (Kaveri) family GPUs. CISA's advisory assessment of 'Misinformed' impact indicates that the vulnerability's actual security significance may differ from initial characterization, possibly due to the specific configuration or usage context in affected Siemens products. The advisory has undergone multiple revisions, with the most recent on 2026-02-25 clarifying affected product configurations and removing rejected CVEs from the advisory scope.

Defensive priority

medium

Recommended defensive actions

Review Siemens ProductCERT advisory SSA-355557 for definitive product impact assessment and patch status
Verify SINEC OS version and installed kernel packages on affected Siemens networking equipment
Monitor CISA ICS advisory ICSA-25-226-07 for updates to threat assessment or affected product list
Apply kernel updates from Siemens when available per vendor maintenance schedule
Implement network segmentation for industrial control systems per CISA recommended practices

Evidence notes

CVE description indicates UBSAN warning in drm/radeon/kv_dpm.c. CISA ICS advisory ICSA-25-226-07 (republished 2026-02-25) lists affected Siemens products but marks impact as 'Misinformed' in threat assessment. Advisory revision history shows multiple updates, including removal of rejected CVEs and clarification of affected configurations. Source references include Siemens ProductCERT SSA-355557 advisory in both CSAF and HTML formats.

Official resources

2025-08-12