linux-cve-announce - CVE-2025-38002: io_uring/fdinfo: grab ctx->uring_lock around io_uring_show

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Message-ID: <2025060644-CVE-2025-38002-5e89@gregkh>
Date: Fri,  6 Jun 2025 15:43:45 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38002: io_uring/fdinfo: grab ctx->uring_lock around io_uring_show_fdinfo()

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

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

io_uring/fdinfo: grab ctx->uring_lock around io_uring_show_fdinfo()

Not everything requires locking in there, which is why the 'has_lock'
variable exists. But enough does that it's a bit unwieldy to manage.
Wrap the whole thing in a ->uring_lock trylock, and just return
with no output if we fail to grab it. The existing trylock() will
already have greatly diminished utility/output for the failure case.

This fixes an issue with reading the SQE fields, if the ring is being
actively resized at the same time.

The Linux kernel CVE team has assigned CVE-2025-38002 to this issue.


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

	Issue introduced in 6.13 with commit 79cfe9e59c2a12c3b3faeeefe38d23f3d8030972 and fixed in 6.14.8 with commit bdb7d2ec2e31c46c45d1f32667dfa8216a72705e
	Issue introduced in 6.13 with commit 79cfe9e59c2a12c3b3faeeefe38d23f3d8030972 and fixed in 6.15 with commit d871198ee431d90f5308d53998c1ba1d5db5619a

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-2025-38002
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/fdinfo.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/bdb7d2ec2e31c46c45d1f32667dfa8216a72705e
	https://git.kernel.org/stable/c/d871198ee431d90f5308d53998c1ba1d5db5619a