CVE-2023-53446

HighCVSS 7.8/10Last modified Jun 17, 2026

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]

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-416

Affected software

VendorProductVersions
LinuxLinux>= b5a0a9b59c8185aebcd9a717e2e6258b58c72c06, < 666e7f9d60cee23077ea3e6331f6f8a19f7ea03f; >= b5a0a9b59c8185aebcd9a717e2e6258b58c72c06, < 7badf4d6f49a358a01ab072bbff88d3ee886c33b; >= b5a0a9b59c8185aebcd9a717e2e6258b58c72c06, < 9856c0de49052174ab474113f4ba40c02aaee086; >= b5a0a9b59c8185aebcd9a717e2e6258b58c72c06, < 7aecdd47910c51707696e8b0e045b9f88bd4230f; >= b5a0a9b59c8185aebcd9a717e2e6258b58c72c06, < d51d2eeae4ce54d542909c4d9d07bf371a78592c; >= b5a0a9b59c8185aebcd9a717e2e6258b58c72c06, < 4203722d51afe3d239e03f15cc73efdf023a7103; >= b5a0a9b59c8185aebcd9a717e2e6258b58c72c06, < 456d8aa37d0f56fc9e985e812496e861dcd6f2f2
LinuxLinux4.11

References

Timeline

Published
Sep 18, 2025
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2023-53446: High severity, CVSS 7.8 | Vulnix