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/waitid: always prune wait queue entry in io_waitid_wait() For a successful return, always remove our entry from the wait queue entry list. Previously this was skipped if a cancelation was in progress, but this can race with another invocation of the wait queue entry callback.

CVSS Scores

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Meta Information

Published

2025-10-28

Last Modified

2025-10-30

Generated

2026-07-06

AI Q&A

2025-10-28

EPSS Evaluated

2026-07-05

NVD

CVE-2025-40047

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability in the Linux kernel involves the io_uring subsystem's wait queue handling. Specifically, the function io_waitid_wait() did not always remove its entry from the wait queue if a cancellation was in progress, which could cause a race condition with another invocation of the wait queue entry callback. The fix ensures that the wait queue entry is always pruned on a successful return to prevent this race condition.

Impact Analysis

The vulnerability could lead to race conditions in the kernel's io_uring wait queue handling, potentially causing unexpected behavior such as resource leaks, deadlocks, or kernel instability. This could impact system reliability and security depending on how io_uring is used.

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