Kernel memory corruption via failed console resize
Published Sep 4, 2025 · Updated Aug 5, 2026
Out-of-bounds write in affected Linux kernel branches allows local users to corrupt kernel memory through FBIOPUT_CON2FBMAP. After vc_do_resize fails, set_con2fb_map retains the new framebuffer mapping while fbcon_putcs uses console data from the prior framebuffer, causing fast_imageblit to write outside its vmalloc buffer. The requested console must be the visible foreground console; successful exploitation can alter kernel memory or crash the system.
Summary
What happened
Out-of-bounds write in affected Linux kernel branches allows local users to corrupt kernel memory through FBIOPUT_CON2FBMAP. After vc_do_resize fails, set_con2fb_map retains the new framebuffer mapping while fbcon_putcs uses console data from the prior framebuffer, causing fast_imageblit to write outside its vmalloc buffer. The requested console must be the visible foreground console; successful exploitation can alter kernel memory or crash the system.
The record
- CVE
- CVE-2025-38685
- Published
- Sep 4, 2025
- Updated
- Aug 5, 2026
- Vendor
- Siemens
- Product
- SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
- Classifications
- CWE-787, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 4, 2025CVE publishedPublication date reported by the CVE source.
- Aug 5, 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=V3.1.5 <*
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
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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