CVE-2024-26982 Siemens CVE debrief

Who should care

Organizations that use or manage Siemens SIMATIC S7-1500 TM MFP - BIOS should review the advisory, especially teams responsible for industrial control systems, embedded platforms, and any local software deployment or maintenance workflows on affected equipment. Security teams should also pay attention because the issue is local and low-privilege, which can matter where multiple users or maintenance access exist.

Technical summary

The source corpus ties CVE-2024-26982 to a Linux kernel Squashfs validation defect: the inode number was not being checked against the invalid value zero. The advisory provides a CVSS 3.1 vector of AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H, indicating a locally reachable issue requiring low privileges and no user interaction, with high confidentiality and availability impact. The Siemens advisory also states that no fix is available at the time of publication.

Defensive priority

High for affected Siemens deployments, because the advisory lists no available fix and the vulnerability can be exercised locally with low privileges. Prioritize exposure review, access control hardening, and operational safeguards until Siemens provides a remediation path.

Recommended defensive actions

• Confirm whether your environment includes Siemens SIMATIC S7-1500 TM MFP - BIOS systems referenced by ICSA-25-072-03.
• Restrict and monitor local access on affected systems, since the CVSS vector requires local access and low privileges.
• Follow Siemens/CISA advisory guidance and track for a future remediation update, because the advisory states that no fix is currently available.
• Apply defense-in-depth controls for industrial systems, including least privilege, trusted software sources, and strict change control.
• Review maintenance, build, and deployment workflows to ensure only trusted applications and artifacts are used on affected platforms.

Evidence notes

This debrief is based only on the supplied CISA CSAF advisory metadata and linked official references. The advisory title is Siemens SIMATIC S7-1500 TM MFP - BIOS, the description states the Linux kernel Squashfs inode-zero validation issue, the CVSS vector is AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H, and the remediation section says no fix is currently available with a workaround to use trusted sources. No KEV entry or ransomware-campaign linkage is provided in the supplied corpus.

Official resources