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GHSA-XCJF-5V2R-GVC9

Vulnerability from github – Published: 2025-04-16 15:34 – Updated: 2026-07-16 12:31
VLAI
Details

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

PCI/ASPM: Fix link state exit during switch upstream function removal

Before 456d8aa37d0f ("PCI/ASPM: Disable ASPM on MFD function removal to avoid use-after-free"), we would free the ASPM link only after the last function on the bus pertaining to the given link was removed.

That was too late. If function 0 is removed before sibling function, link->downstream would point to free'd memory after.

After above change, we freed the ASPM parent link state upon any function removal on the bus pertaining to a given link.

That is too early. If the link is to a PCIe switch with MFD on the upstream port, then removing functions other than 0 first would free a link which still remains parent_link to the remaining downstream ports.

The resulting GPFs are especially frequent during hot-unplug, because pciehp removes devices on the link bus in reverse order.

On that switch, function 0 is the virtual P2P bridge to the internal bus. Free exactly when function 0 is removed -- before the parent link is obsolete, but after all subordinate links are gone.

[kwilczynski: commit log]

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2024-58093"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-04-16T15:15:53Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI/ASPM: Fix link state exit during switch upstream function removal\n\nBefore 456d8aa37d0f (\"PCI/ASPM: Disable ASPM on MFD function removal to\navoid use-after-free\"), we would free the ASPM link only after the last\nfunction on the bus pertaining to the given link was removed.\n\nThat was too late. If function 0 is removed before sibling function,\nlink-\u003edownstream would point to free\u0027d memory after.\n\nAfter above change, we freed the ASPM parent link state upon any function\nremoval on the bus pertaining to a given link.\n\nThat is too early. If the link is to a PCIe switch with MFD on the upstream\nport, then removing functions other than 0 first would free a link which\nstill remains parent_link to the remaining downstream ports.\n\nThe resulting GPFs are especially frequent during hot-unplug, because\npciehp removes devices on the link bus in reverse order.\n\nOn that switch, function 0 is the virtual P2P bridge to the internal bus.\nFree exactly when function 0 is removed -- before the parent link is\nobsolete, but after all subordinate links are gone.\n\n[kwilczynski: commit log]",
  "id": "GHSA-xcjf-5v2r-gvc9",
  "modified": "2026-07-16T12:31:42Z",
  "published": "2025-04-16T15:34:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-58093"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0a0f9aecf66b98959aab7fb5764b4b3e522f4f5b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4d96930239981f312821a4065db8cc0f8240a173"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/62db339ecc3d58d8fd83a9e4d80061cd943bb6e2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8b930ddc2044e36866c41423e89889e0258695a3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ba4cdc14c0d4df00d3e99bff7fe545303db98183"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cbf937dcadfd571a434f8074d057b32cd14fbea5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cd4b07507794f7ad1a74e12eca75121d98187e66"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e5cd58f61e9d8024ee11bd78c12c8916891d4077"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f556b6ba0ac5f8353287ce6ed761228f0b4fafb7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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