FKIE_CVE-2023-53446

Vulnerability from fkie_nvd - Published: 2025-09-18 16:15 - Updated: 2025-09-19 16:00
Severity ?
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]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4203722d51afe3d239e03f15cc73efdf023a7103
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/456d8aa37d0f56fc9e985e812496e861dcd6f2f2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/666e7f9d60cee23077ea3e6331f6f8a19f7ea03f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7aecdd47910c51707696e8b0e045b9f88bd4230f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7badf4d6f49a358a01ab072bbff88d3ee886c33b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9856c0de49052174ab474113f4ba40c02aaee086
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d51d2eeae4ce54d542909c4d9d07bf371a78592c
Impacted products
Vendor Product Version
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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]"
    }
  ],
  "id": "CVE-2023-53446",
  "lastModified": "2025-09-19T16:00:27.847",
  "metrics": {},
  "published": "2025-09-18T16:15:48.940",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4203722d51afe3d239e03f15cc73efdf023a7103"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/456d8aa37d0f56fc9e985e812496e861dcd6f2f2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/666e7f9d60cee23077ea3e6331f6f8a19f7ea03f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7aecdd47910c51707696e8b0e045b9f88bd4230f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7badf4d6f49a358a01ab072bbff88d3ee886c33b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9856c0de49052174ab474113f4ba40c02aaee086"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d51d2eeae4ce54d542909c4d9d07bf371a78592c"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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