linux-cve-announce - CVE-2025-21659: netdev: prevent accessing NAPI instances from another namespace

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <2025012133-CVE-2025-21659-1c41@gregkh>
Date: Tue, 21 Jan 2025 13:18:38 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21659: netdev: prevent accessing NAPI instances from another namespace

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

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

netdev: prevent accessing NAPI instances from another namespace

The NAPI IDs were not fully exposed to user space prior to the netlink
API, so they were never namespaced. The netlink API must ensure that
at the very least NAPI instance belongs to the same netns as the owner
of the genl sock.

napi_by_id() can become static now, but it needs to move because of
dev_get_by_napi_id().

The Linux kernel CVE team has assigned CVE-2025-21659 to this issue.


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

	Issue introduced in 6.8 with commit 27f91aaf49b3a50e5a02ad5fa27b7c453d029a72 and fixed in 6.12.10 with commit b683ba0df11ff563cc237eb1b74d6adfa77226bf
	Issue introduced in 6.8 with commit 27f91aaf49b3a50e5a02ad5fa27b7c453d029a72 and fixed in 6.13 with commit d1cacd74776895f6435941f86a1130e58f6dd226

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-2025-21659
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/core/dev.c
	net/core/dev.h
	net/core/netdev-genl.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/b683ba0df11ff563cc237eb1b74d6adfa77226bf
	https://git.kernel.org/stable/c/d1cacd74776895f6435941f86a1130e58f6dd226