linux-cve-announce - CVE-2025-38570: eth: fbnic: unlink NAPIs from queues on error to open

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Message-ID: <2025081910-CVE-2025-38570-b790@gregkh>
Date: Tue, 19 Aug 2025 19:18:17 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38570: eth: fbnic: unlink NAPIs from queues on error to open

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

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

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

eth: fbnic: unlink NAPIs from queues on error to open

CI hit a UaF in fbnic in the AF_XDP portion of the queues.py test.
The UaF is in the __sk_mark_napi_id_once() call in xsk_bind(),
NAPI has been freed. Looks like the device failed to open earlier,
and we lack clearing the NAPI pointer from the queue.

The Linux kernel CVE team has assigned CVE-2025-38570 to this issue.


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

	Issue introduced in 6.14 with commit 557d02238e05eb66b9aba9a1f90f3a2131c6c887 and fixed in 6.15.10 with commit 21d3f8441c7f317b93ba6a8029610c8b7e3773db
	Issue introduced in 6.14 with commit 557d02238e05eb66b9aba9a1f90f3a2131c6c887 and fixed in 6.16.1 with commit 4b59f9deff3bdb52b223c85048f1d2924803b817
	Issue introduced in 6.14 with commit 557d02238e05eb66b9aba9a1f90f3a2131c6c887 and fixed in 6.17-rc1 with commit 4b31bcb025cb497da2b01f87173108ff32d350d2

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-2025-38570
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:
	drivers/net/ethernet/meta/fbnic/fbnic_netdev.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/21d3f8441c7f317b93ba6a8029610c8b7e3773db
	https://git.kernel.org/stable/c/4b59f9deff3bdb52b223c85048f1d2924803b817
	https://git.kernel.org/stable/c/4b31bcb025cb497da2b01f87173108ff32d350d2