linux-cve-announce - CVE-2025-71233: PCI: endpoint: Avoid creating sub-groups asynchronously

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Message-ID: <2026021805-CVE-2025-71233-0c35@gregkh>
Date: Wed, 18 Feb 2026 15:54:04 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-71233: PCI: endpoint: Avoid creating sub-groups asynchronously

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

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

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

PCI: endpoint: Avoid creating sub-groups asynchronously

The asynchronous creation of sub-groups by a delayed work could lead to a
NULL pointer dereference when the driver directory is removed before the
work completes.

The crash can be easily reproduced with the following commands:

  # cd /sys/kernel/config/pci_ep/functions/pci_epf_test
  # for i in {1..20}; do mkdir test && rmdir test; done

  BUG: kernel NULL pointer dereference, address: 0000000000000088
  ...
  Call Trace:
   configfs_register_group+0x3d/0x190
   pci_epf_cfs_work+0x41/0x110
   process_one_work+0x18f/0x350
   worker_thread+0x25a/0x3a0

Fix this issue by using configfs_add_default_group() API which does not
have the deadlock problem as configfs_register_group() and does not require
the delayed work handler.

[mani: slightly reworded the description and added stable list]

The Linux kernel CVE team has assigned CVE-2025-71233 to this issue.


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

	Fixed in 6.12.72 with commit d9af3cf58bb4c8d6dea4166011c780756b1138b5
	Fixed in 6.18.11 with commit 24a253c3aa6d9a2cde46158ce9782e023bfbf32d
	Fixed in 6.19.1 with commit 73cee890adafa2c219bb865356e08e7f82423fe5

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-2025-71233
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/pci/endpoint/pci-ep-cfs.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/d9af3cf58bb4c8d6dea4166011c780756b1138b5
	https://git.kernel.org/stable/c/24a253c3aa6d9a2cde46158ce9782e023bfbf32d
	https://git.kernel.org/stable/c/73cee890adafa2c219bb865356e08e7f82423fe5
	https://git.kernel.org/stable/c/7c5c7d06bd1f86d2c3ebe62be903a4ba42db4d2c