CVE-2025-40291
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-12-08

Last updated on: 2025-12-08

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: io_uring: fix regbuf vector size truncation There is a report of io_estimate_bvec_size() truncating the calculated number of segments that leads to corruption issues. Check it doesn't overflow "int"s used later. Rough but simple, can be improved on top.
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2025-12-08
Last Modified
2025-12-08
Generated
2026-06-16
AI Q&A
2025-12-08
EPSS Evaluated
2026-06-15
NVD
CVE-2025-40291
EUVD
EUVD-2025-201653
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
Executive Summary

This vulnerability involves the Linux kernel's io_uring subsystem, where the function io_estimate_bvec_size() incorrectly truncates the calculated number of segments. This truncation can lead to corruption issues because it may cause an overflow in the integer values used later in the process.

Impact Analysis

The vulnerability can lead to data corruption within the Linux kernel's io_uring subsystem, potentially affecting system stability and data integrity when using io_uring for asynchronous I/O operations.

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2025-40291. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart