CVE-2023-53446 (GCVE-0-2023-53446)

Vulnerability from cvelistv5 – Published: 2025-09-18 16:04 – Updated: 2026-01-14 19:23
VLAI?
Title
PCI/ASPM: Disable ASPM on MFD function removal to avoid use-after-free
Summary
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]
Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 , < 666e7f9d60cee23077ea3e6331f6f8a19f7ea03f (git)
Affected: b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 , < 7badf4d6f49a358a01ab072bbff88d3ee886c33b (git)
Affected: b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 , < 9856c0de49052174ab474113f4ba40c02aaee086 (git)
Affected: b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 , < 7aecdd47910c51707696e8b0e045b9f88bd4230f (git)
Affected: b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 , < d51d2eeae4ce54d542909c4d9d07bf371a78592c (git)
Affected: b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 , < 4203722d51afe3d239e03f15cc73efdf023a7103 (git)
Affected: b5a0a9b59c8185aebcd9a717e2e6258b58c72c06 , < 456d8aa37d0f56fc9e985e812496e861dcd6f2f2 (git)
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    Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 5.4.251 , ≤ 5.4.* (semver)
Unaffected: 5.10.188 , ≤ 5.10.* (semver)
Unaffected: 5.15.121 , ≤ 5.15.* (semver)
Unaffected: 6.1.39 , ≤ 6.1.* (semver)
Unaffected: 6.3.13 , ≤ 6.3.* (semver)
Unaffected: 6.4.4 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI/ASPM: Disable ASPM on MFD function removal to avoid use-after-free\n\nStruct pcie_link_state-\u003edownstream is a pointer to the pci_dev of function\n0.  Previously we retained that pointer when removing function 0, and\nsubsequent ASPM policy changes dereferenced it, resulting in a\nuse-after-free warning from KASAN, e.g.:\n\n  # echo 1 \u003e /sys/bus/pci/devices/0000:03:00.0/remove\n  # echo powersave \u003e /sys/module/pcie_aspm/parameters/policy\n\n  BUG: KASAN: slab-use-after-free in pcie_config_aspm_link+0x42d/0x500\n  Call Trace:\n   kasan_report+0xae/0xe0\n   pcie_config_aspm_link+0x42d/0x500\n   pcie_aspm_set_policy+0x8e/0x1a0\n   param_attr_store+0x162/0x2c0\n   module_attr_store+0x3e/0x80\n\nPCIe spec r6.0, sec 7.5.3.7, recommends that software program the same ASPM\nControl value in all functions of multi-function devices.\n\nDisable ASPM and free the pcie_link_state when any child function is\nremoved so we can discard the dangling pcie_link_state-\u003edownstream pointer\nand maintain the same ASPM Control configuration for all functions.\n\n[bhelgaas: commit log and comment]"
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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