linux-cve-announce - CVE-2025-40047: io_uring/waitid: always prune wait queue entry in io_waitid

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Message-ID: <2025102813-CVE-2025-40047-b952@gregkh>
Date: Tue, 28 Oct 2025 12:48:24 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40047: io_uring/waitid: always prune wait queue entry in io_waitid_wait()

From: Greg Kroah-Hartman <gregkh@...nel.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.

The Linux kernel CVE team has assigned CVE-2025-40047 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 6.7 with commit f31ecf671ddc498f20219453395794ff2383e06b and fixed in 6.12.53 with commit 696ba6032081e617564a8113a001b8d7943cb928
	Issue introduced in 6.7 with commit f31ecf671ddc498f20219453395794ff2383e06b and fixed in 6.17.3 with commit 3e2205db2f0608898d535da1964e1b376aacfdaa
	Issue introduced in 6.7 with commit f31ecf671ddc498f20219453395794ff2383e06b and fixed in 6.18-rc1 with commit 2f8229d53d984c6a05b71ac9e9583d4354e3b91f

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2025-40047
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	io_uring/waitid.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/696ba6032081e617564a8113a001b8d7943cb928
	https://git.kernel.org/stable/c/3e2205db2f0608898d535da1964e1b376aacfdaa
	https://git.kernel.org/stable/c/2f8229d53d984c6a05b71ac9e9583d4354e3b91f