linux-cve-announce - CVE-2025-21808: net: xdp: Disallow attaching device-bound programs in generic mode

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Message-ID: <2025022753-CVE-2025-21808-b8bf@gregkh>
Date: Thu, 27 Feb 2025 12:00:02 -0800
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21808: net: xdp: Disallow attaching device-bound programs in generic mode

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

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

net: xdp: Disallow attaching device-bound programs in generic mode

Device-bound programs are used to support RX metadata kfuncs. These
kfuncs are driver-specific and rely on the driver context to read the
metadata. This means they can't work in generic XDP mode. However, there
is no check to disallow such programs from being attached in generic
mode, in which case the metadata kfuncs will be called in an invalid
context, leading to crashes.

Fix this by adding a check to disallow attaching device-bound programs
in generic mode.

The Linux kernel CVE team has assigned CVE-2025-21808 to this issue.


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

	Issue introduced in 6.3 with commit 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 and fixed in 6.6.76 with commit b1bc4a35a04cbeb85b6ef5911ec015baa424989f
	Issue introduced in 6.3 with commit 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 and fixed in 6.12.13 with commit 557707906dd3e34b8a8c265f664d19f95799937e
	Issue introduced in 6.3 with commit 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 and fixed in 6.13.2 with commit 5a9eae683d6c36e8a7aa31e5eb8b369e41aa66e1
	Issue introduced in 6.3 with commit 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 and fixed in 6.14-rc1 with commit 3595599fa8360bb3c7afa7ee50c810b4a64106ea

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-2025-21808
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


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/b1bc4a35a04cbeb85b6ef5911ec015baa424989f
	https://git.kernel.org/stable/c/557707906dd3e34b8a8c265f664d19f95799937e
	https://git.kernel.org/stable/c/5a9eae683d6c36e8a7aa31e5eb8b369e41aa66e1
	https://git.kernel.org/stable/c/3595599fa8360bb3c7afa7ee50c810b4a64106ea