CVE-2025-39888
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-23

Last updated on: 2025-12-12

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: fuse: Block access to folio overlimit syz reported a slab-out-of-bounds Write in fuse_dev_do_write. When the number of bytes to be retrieved is truncated to the upper limit by fc->max_pages and there is an offset, the oob is triggered. Add a loop termination condition to prevent overruns.
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Meta Information
Published
2025-09-23
Last Modified
2025-12-12
Generated
2026-06-16
AI Q&A
2025-09-23
EPSS Evaluated
2026-06-14
NVD
CVE-2025-39888
Affected Vendors & Products
Showing 6 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 6.16 (inc) to 6.16.8 (exc)
linux linux_kernel 6.17
linux linux_kernel 6.17
linux linux_kernel 6.17
linux linux_kernel 6.17
linux linux_kernel 6.17
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-787 The product writes data past the end, or before the beginning, of the intended buffer.
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Executive Summary

This vulnerability is a slab-out-of-bounds write in the Linux kernel's fuse device driver (fuse_dev_do_write). It occurs when the number of bytes to be retrieved is truncated to an upper limit by max_pages and there is an offset, which triggers an out-of-bounds write. The issue was fixed by adding a loop termination condition to prevent memory overruns.

Impact Analysis

This vulnerability could lead to memory corruption in the Linux kernel, potentially causing system instability, crashes, or allowing an attacker to execute arbitrary code with kernel privileges.

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