CVE-2025-40046
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-10-28

Last updated on: 2025-10-30

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: io_uring/zcrx: fix overshooting recv limit It's reported that sometimes a zcrx request can receive more than was requested. It's caused by io_zcrx_recv_skb() adjusting desc->count for all received buffers including frag lists, but then doing recursive calls to process frag list skbs, which leads to desc->count double accounting and underflow.
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Meta Information
Published
2025-10-28
Last Modified
2025-10-30
Generated
2026-06-16
AI Q&A
2025-10-28
EPSS Evaluated
2026-06-15
NVD
CVE-2025-40046
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability in the Linux kernel's io_uring subsystem involves the zcrx request sometimes receiving more data than requested. It occurs because the function io_zcrx_recv_skb() incorrectly adjusts the descriptor's count for all received buffers, including fragment lists, and then recursively processes these fragment lists. This leads to double counting and an underflow in the descriptor's count, causing the system to overshoot the receive limit.

Impact Analysis

The vulnerability can cause the system to receive more data than expected, which may lead to buffer management issues such as data corruption, unexpected behavior, or potential security risks related to handling more data than intended.

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