Kernel memory corruption via framebuffer clipping overrun
Published Dec 24, 2025 · Updated Dec 24, 2025
Out-of-bounds access in Linux kernel 5.18 through 6.1.29 and 6.2 through 6.3.3 allows local users to corrupt kernel memory via /dev/fb0. drm_fb_helper_memory_range_to_clip() rounds a page-aligned buffer endpoint upward without clamping the damage rectangle to the active display, so memcpy_toio() copies an extra scanline beyond a buffer boundary. Access to the fbdev emulation node is required; a crafted write or mmap dirty operation can expose adjacent kernel data, corrupt memory, or hang the system.
Summary
What happened
Out-of-bounds access in Linux kernel 5.18 through 6.1.29 and 6.2 through 6.3.3 allows local users to corrupt kernel memory via /dev/fb0. drm_fb_helper_memory_range_to_clip() rounds a page-aligned buffer endpoint upward without clamping the damage rectangle to the active display, so memcpy_toio() copies an extra scanline beyond a buffer boundary. Access to the fbdev emulation node is required; a crafted write or mmap dirty operation can expose adjacent kernel data, corrupt memory, or hang the system.
The record
- CVE
- CVE-2023-54116
- Published
- Dec 24, 2025
- Updated
- Dec 24, 2025
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 24, 2025CVE publishedPublication date reported by the CVE source.
- Dec 24, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=5.18
- Affected versionversion=aa15c677cc34e626789cb65b8e7375180851c03b <251653fa974ea551a15d16cacfed7cde68cc7f87
- Affected versionversion=aa15c677cc34e626789cb65b8e7375180851c03b <c8687694bb1f5c48134f152f8c5c2e53483eb99d
- Affected versionversion=aa15c677cc34e626789cb65b8e7375180851c03b <efd2821b8abeccb6b51423002e2a62921481a26e
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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