linux-cve-announce - CVE-2025-21997: xsk: fix an integer overflow in xp_create_and_assign

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Message-ID: <2025040348-CVE-2025-21997-492c@gregkh>
Date: Thu,  3 Apr 2025 08:17:49 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21997: xsk: fix an integer overflow in xp_create_and_assign_umem()

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

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

xsk: fix an integer overflow in xp_create_and_assign_umem()

Since the i and pool->chunk_size variables are of type 'u32',
their product can wrap around and then be cast to 'u64'.
This can lead to two different XDP buffers pointing to the same
memory area.

Found by InfoTeCS on behalf of Linux Verification Center
(linuxtesting.org) with SVACE.

The Linux kernel CVE team has assigned CVE-2025-21997 to this issue.


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

	Issue introduced in 5.16 with commit 94033cd8e73b8632bab7c8b7bb54caa4f5616db7 and fixed in 6.1.132 with commit 205649d642a5b376724f04f3a5b3586815e43d3b
	Issue introduced in 5.16 with commit 94033cd8e73b8632bab7c8b7bb54caa4f5616db7 and fixed in 6.6.85 with commit b7b4be1fa43294b50b22e812715198629806678a
	Issue introduced in 5.16 with commit 94033cd8e73b8632bab7c8b7bb54caa4f5616db7 and fixed in 6.12.21 with commit 130290f44bce0eead2b827302109afc3fe189ddd
	Issue introduced in 5.16 with commit 94033cd8e73b8632bab7c8b7bb54caa4f5616db7 and fixed in 6.13.9 with commit c7670c197b0f1a8726ad5c87bc2bf001a1fc1bbd
	Issue introduced in 5.16 with commit 94033cd8e73b8632bab7c8b7bb54caa4f5616db7 and fixed in 6.14 with commit 559847f56769037e5b2e0474d3dbff985b98083d

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-2025-21997
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:
	net/xdp/xsk_buff_pool.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/205649d642a5b376724f04f3a5b3586815e43d3b
	https://git.kernel.org/stable/c/b7b4be1fa43294b50b22e812715198629806678a
	https://git.kernel.org/stable/c/130290f44bce0eead2b827302109afc3fe189ddd
	https://git.kernel.org/stable/c/c7670c197b0f1a8726ad5c87bc2bf001a1fc1bbd
	https://git.kernel.org/stable/c/559847f56769037e5b2e0474d3dbff985b98083d