PatchSiren cyber security CVE debrief

CVE-2024-40943 Siemens CVE debrief

CVE-2024-40943 describes a race condition in the OCFS2 (Oracle Cluster File System 2) Linux kernel module between hole punching operations and asynchronous I/O (AIO) combined with direct I/O (DIO). The vulnerability was published on 2025-08-12 and last modified on 2026-02-25. The source advisory (ICSA-25-226-07) from CISA's CSAF repository indicates this CVE was included in a Siemens ProductCERT advisory concerning third-party components in SINEC OS. However, the threat assessment in the source material categorizes the impact as 'Misinformed' for the affected product IDs (CSAFPID-0006, CSAFPID-0002, CSAFPID-0003), suggesting the vulnerability may have been incorrectly attributed to certain Siemens products or requires clarification regarding actual affected status. The vendor information identifies Siemens as the vendor with specific product mentions including RUGGEDCOM RST2428P and SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family devices. The revision history shows multiple updates, with the most recent on 2026-02-25 being a 'CISA Republication update based on Siemens ProductCERT SSA-355557 advisory.' This CVE is not listed in CISA's Known Exploited Vulnerabilities (KEV) catalog. The underlying issue involves filesystem-level race conditions that could potentially lead to data corruption or unexpected behavior when hole punching (deallocating file space) occurs concurrently with AIO+DIO operations.

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 running Siemens industrial networking equipment with SINEC OS, particularly RUGGEDCOM and SCALANCE product families. System administrators managing Linux-based industrial control systems utilizing OCFS2 filesystems with AIO+DIO workloads. Security teams tracking third-party component vulnerabilities in OT/ICS environments. Kernel maintainers and Linux distribution vendors providing OCFS2 support.

Technical summary

CVE-2024-40943 addresses a race condition vulnerability in the OCFS2 (Oracle Cluster File System 2) Linux kernel filesystem module. The specific issue occurs when hole punching operations—used to deallocate file space and create sparse files—execute concurrently with asynchronous I/O (AIO) combined with direct I/O (DIO) operations. Race conditions in filesystem operations can lead to data corruption, file metadata inconsistencies, or system instability. The vulnerability exists in the kernel's filesystem layer rather than user-space applications. The source advisory indicates this CVE was initially associated with Siemens industrial networking products (RUGGEDCOM RST2428P, SCALANCE families) running SINEC OS, but the 'Misinformed' impact classification suggests the attribution required clarification. Multiple advisory revisions between 2025-08-12 and 2026-02-25 indicate ongoing analysis of actual affected product scope. Organizations running OCFS2 on Linux-based systems, particularly those in industrial control environments using affected Siemens infrastructure, should verify kernel patch status and monitor vendor guidance.

Defensive priority

medium

Recommended defensive actions

Review Siemens ProductCERT SSA-355557 advisory for current affected product status
Verify OCFS2 kernel module usage in deployed Siemens infrastructure
Apply kernel updates from Siemens or Linux distribution vendors addressing OCFS2 race conditions
Monitor filesystem integrity on systems utilizing OCFS2 with AIO+DIO workloads
Review CISA ICS recommended practices for defense-in-depth strategies

Evidence notes

Source indicates 'Misinformed' impact classification for affected product IDs. Multiple advisory revisions suggest ongoing clarification of affected product scope. Not listed in CISA KEV.

Official resources

2025-08-12