CVE-2025-39822
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-16

Last updated on: 2025-12-02

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: io_uring/kbuf: fix signedness in this_len calculation When importing and using buffers, buf->len is considered unsigned. However, buf->len is converted to signed int when committing. This can lead to unexpected behavior if the buffer is large enough to be interpreted as a negative value. Make min_t calculation unsigned.
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Meta Information
Published
2025-09-16
Last Modified
2025-12-02
Generated
2026-06-16
AI Q&A
2025-09-16
EPSS Evaluated
2026-06-15
NVD
CVE-2025-39822
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 6.12 (inc) to 6.16.5 (exc)
linux linux_kernel 6.17
linux linux_kernel 6.17
linux linux_kernel 6.17
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Exploitability
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Executive Summary

This vulnerability involves a signedness error in the Linux kernel's io_uring subsystem. Specifically, when importing and using buffers, the buffer length (buf->len) is treated as unsigned, but during processing, it is converted to a signed integer. If the buffer length is large enough, this conversion can cause it to be interpreted as a negative value, leading to unexpected behavior. The fix involves making the calculation unsigned to prevent this issue.

Impact Analysis

The vulnerability can cause unexpected behavior in the Linux kernel when handling large buffers due to incorrect signedness conversion. This may lead to potential instability, incorrect processing of data, or security issues related to buffer handling in systems using io_uring.

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