Kernel compromise via ROSE timer use-after-free
Published Feb 27, 2025 · Updated Sep 8, 2026
Use-after-free in Linux and Siemens S7-1500 MFP controllers allows local users to compromise the kernel through AF_ROSE socket calls. ROSE timers take the socket spinlock without checking whether a user thread owns the socket, so timer expiry can race socket operations and dereference freed memory in rose_timer_expiry. Exploitation requires local low-privileged access and available AF_ROSE support; successful exploitation can expose or alter kernel memory or crash the system.
Summary
What happened
Use-after-free in Linux and Siemens S7-1500 MFP controllers allows local users to compromise the kernel through AF_ROSE socket calls. ROSE timers take the socket spinlock without checking whether a user thread owns the socket, so timer expiry can race socket operations and dereference freed memory in rose_timer_expiry. Exploitation requires local low-privileged access and available AF_ROSE support; successful exploitation can expose or alter kernel memory or crash the system.
The record
- CVE
- CVE-2025-21718
- Published
- Feb 27, 2025
- Updated
- Sep 8, 2026
- Vendor
- Siemens
- Product
- SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
- Classifications
- CWE-416, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 27, 2025CVE publishedPublication date reported by the CVE source.
- Sep 8, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=V3.1.6 <*
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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