linux-cve-announce - CVE-2023-53446: PCI/ASPM: Disable ASPM on MFD function removal to avoid use-after-free

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: <2025091800-CVE-2023-53446-2fcb@gregkh>
Date: Thu, 18 Sep 2025 18:04:37 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53446: PCI/ASPM: Disable ASPM on MFD function removal to avoid use-after-free

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

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

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

PCI/ASPM: Disable ASPM on MFD function removal to avoid use-after-free

Struct pcie_link_state->downstream is a pointer to the pci_dev of function
0.  Previously we retained that pointer when removing function 0, and
subsequent ASPM policy changes dereferenced it, resulting in a
use-after-free warning from KASAN, e.g.:

  # echo 1 > /sys/bus/pci/devices/0000:03:00.0/remove
  # echo powersave > /sys/module/pcie_aspm/parameters/policy

  BUG: KASAN: slab-use-after-free in pcie_config_aspm_link+0x42d/0x500
  Call Trace:
   kasan_report+0xae/0xe0
   pcie_config_aspm_link+0x42d/0x500
   pcie_aspm_set_policy+0x8e/0x1a0
   param_attr_store+0x162/0x2c0
   module_attr_store+0x3e/0x80

PCIe spec r6.0, sec 7.5.3.7, recommends that software program the same ASPM
Control value in all functions of multi-function devices.

Disable ASPM and free the pcie_link_state when any child function is
removed so we can discard the dangling pcie_link_state->downstream pointer
and maintain the same ASPM Control configuration for all functions.

[bhelgaas: commit log and comment]

The Linux kernel CVE team has assigned CVE-2023-53446 to this issue.


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

	Issue introduced in 4.11 with commit b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 and fixed in 5.4.251 with commit 666e7f9d60cee23077ea3e6331f6f8a19f7ea03f
	Issue introduced in 4.11 with commit b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 and fixed in 5.10.188 with commit 7badf4d6f49a358a01ab072bbff88d3ee886c33b
	Issue introduced in 4.11 with commit b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 and fixed in 5.15.121 with commit 9856c0de49052174ab474113f4ba40c02aaee086
	Issue introduced in 4.11 with commit b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 and fixed in 6.1.39 with commit 7aecdd47910c51707696e8b0e045b9f88bd4230f
	Issue introduced in 4.11 with commit b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 and fixed in 6.3.13 with commit d51d2eeae4ce54d542909c4d9d07bf371a78592c
	Issue introduced in 4.11 with commit b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 and fixed in 6.4.4 with commit 4203722d51afe3d239e03f15cc73efdf023a7103
	Issue introduced in 4.11 with commit b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 and fixed in 6.5 with commit 456d8aa37d0f56fc9e985e812496e861dcd6f2f2

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-2023-53446
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/pcie/aspm.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/666e7f9d60cee23077ea3e6331f6f8a19f7ea03f
	https://git.kernel.org/stable/c/7badf4d6f49a358a01ab072bbff88d3ee886c33b
	https://git.kernel.org/stable/c/9856c0de49052174ab474113f4ba40c02aaee086
	https://git.kernel.org/stable/c/7aecdd47910c51707696e8b0e045b9f88bd4230f
	https://git.kernel.org/stable/c/d51d2eeae4ce54d542909c4d9d07bf371a78592c
	https://git.kernel.org/stable/c/4203722d51afe3d239e03f15cc73efdf023a7103
	https://git.kernel.org/stable/c/456d8aa37d0f56fc9e985e812496e861dcd6f2f2