Bug 2393168 (CVE-2025-38702)

Summary: CVE-2025-38702 kernel: fbdev: fix potential buffer overflow in do_register_framebuffer()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-09-04 16:02:21 UTC 
In the Linux kernel, the following vulnerability has been resolved:

fbdev: fix potential buffer overflow in do_register_framebuffer()

The current implementation may lead to buffer overflow when:
1.  Unregistration creates NULL gaps in registered_fb[]
2.  All array slots become occupied despite num_registered_fb < FB_MAX
3.  The registration loop exceeds array bounds

Add boundary check to prevent registered_fb[FB_MAX] access.
Comment 1 Jon Moroney 2025-09-04 18:32:59 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025090453-CVE-2025-38702-0b09@gregkh/T