PatchSiren cyber security CVE debrief

CVE-2024-50287 Siemens CVE debrief

A division-by-zero vulnerability exists in the Linux kernel's Video4Linux2 Test Pattern Generator (v4l2-tpg). The flaw occurs in the `tpg_precalculate_line()` function, which blindly rescales a buffer without validating that `scaled_width` is non-zero. This condition, detected by Coverity static analysis, can trigger a kernel crash when exploited by a local attacker with low privileges. The vulnerability affects Siemens industrial networking products running SINEC OS, specifically the RUGGEDCOM RST2428P and SCALANCE XC/XR/XCM/XRM/XCH/XRH families. Siemens has released firmware updates to address this issue.

Vendor: Siemens
Product: RUGGEDCOM RST2428P (6GK6242-6PA00)
CVSS: MEDIUM 5.5
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 infrastructure including RUGGEDCOM RST2428P switches and SCALANCE XC/XR/XCM/XRM/XCH/XRH family devices. OT security teams managing SINEC OS deployments in critical infrastructure environments. System administrators responsible for firmware maintenance of Siemens industrial Ethernet switches.

Technical summary

The vulnerability resides in the Video4Linux2 Test Pattern Generator (v4l2-tpg) component of the Linux kernel. The `tpg_precalculate_line()` function performs buffer rescaling operations without validating that the `scaled_width` parameter is non-zero. When `scaled_width` equals zero, the rescaling logic triggers a division-by-zero condition, resulting in a kernel crash and system availability impact. This is a local attack vector requiring low privileges with no user interaction. The CVSS 3.1 vector is AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H, indicating high availability impact but no confidentiality or integrity impact.

Defensive priority

medium

Recommended defensive actions

Apply vendor-provided firmware updates to affected Siemens industrial networking devices. For RUGGEDCOM RST2428P and SCALANCE XCM-/XRM-/XCH-/XRH-300 family devices, update to firmware version V3.2 or later. For SCALANCE
severityScore
severityScore
severityScore
severityScore
severityScore
severityScore
severityScore

Evidence notes

The vulnerability was identified through Coverity static analysis. The flaw is located in the Linux kernel's v4l2-tpg subsystem, specifically in the `tpg_precalculate_line()` function where buffer rescaling occurs without zero-check validation of the `scaled_width` parameter.

Sources and references

Verified primary and authoritative sources

CVE-2024-50287 CVE Program record
Publisher, destination, and source semantics verified

URL: https://www.cve.org/CVERecord?id=CVE-2024-50287

CVE Program - Official CVE Program record with source-provided CVE metadata.
CVE-2024-50287 NVD vulnerability detail
Publisher, destination, and source semantics verified

URL: https://nvd.nist.gov/vuln/detail/CVE-2024-50287

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.