CVE-2023-53446: In the Linux kernel, the following vulnerability has been resolved: PCI/ASPM: Disable ASPM on MFD function removal to avoid use-after-free Struct…

PriorityP340high7.8CVSS 3.1

AVLACLPRLUINSUCHIHAH

EPSS

0.14%

3.8th percentile

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]

Affected

19 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.1.52-1 (bookworm)	linux 6.1.52-1 (bookworm)
linux	linux	—	—
linux	linux	>= b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 < 666e7f9d60cee23077ea3e6331f6f8a19f7ea03f	666e7f9d60cee23077ea3e6331f6f8a19f7ea03f
linux	linux	>= b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 < 7badf4d6f49a358a01ab072bbff88d3ee886c33b	7badf4d6f49a358a01ab072bbff88d3ee886c33b
linux	linux	>= b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 < 9856c0de49052174ab474113f4ba40c02aaee086	9856c0de49052174ab474113f4ba40c02aaee086
linux	linux	>= b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 < 7aecdd47910c51707696e8b0e045b9f88bd4230f	7aecdd47910c51707696e8b0e045b9f88bd4230f
linux	linux	>= b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 < d51d2eeae4ce54d542909c4d9d07bf371a78592c	d51d2eeae4ce54d542909c4d9d07bf371a78592c
linux	linux	>= b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 < 4203722d51afe3d239e03f15cc73efdf023a7103	4203722d51afe3d239e03f15cc73efdf023a7103
linux	linux	>= b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 < 456d8aa37d0f56fc9e985e812496e861dcd6f2f2	456d8aa37d0f56fc9e985e812496e861dcd6f2f2
linux	linux_kernel	>= 0 < 5.10.191-1	5.10.191-1
linux	linux_kernel	>= 0 < 6.1.52-1	6.1.52-1
linux	linux_kernel	>= 0 < 6.4.4-1	6.4.4-1
linux	linux_kernel	>= 0 < 6.4.4-1	6.4.4-1
linux	linux_kernel	>= 4.11 < 5.4.251	5.4.251
linux	linux_kernel	>= 5.11 < 5.15.121	5.15.121
linux	linux_kernel	>= 5.16 < 6.1.39	6.1.39
linux	linux_kernel	>= 5.5 < 5.10.188	5.10.188
linux	linux_kernel	>= 6.2 < 6.3.13	6.3.13
linux	linux_kernel	>= 6.4 < 6.4.4	6.4.4

CVSS provenance

nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

osv7.8HIGH

vendor_debian7.8HIGH

vendor_redhat7.8HIGH

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