ghsa-m8vv-wrwx-6989
Vulnerability from github
Published
2025-08-22 18:31
Modified
2025-08-28 15:30
Details

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

PCI: pnv_php: Clean up allocated IRQs on unplug

When the root of a nested PCIe bridge configuration is unplugged, the pnv_php driver leaked the allocated IRQ resources for the child bridges' hotplug event notifications, resulting in a panic.

Fix this by walking all child buses and deallocating all its IRQ resources before calling pci_hp_remove_devices().

Also modify the lifetime of the workqueue at struct pnv_php_slot::wq so that it is only destroyed in pnv_php_free_slot(), instead of pnv_php_disable_irq(). This is required since pnv_php_disable_irq() will now be called by workers triggered by hot unplug interrupts, so the workqueue needs to stay allocated.

The abridged kernel panic that occurs without this patch is as follows:

WARNING: CPU: 0 PID: 687 at kernel/irq/msi.c:292 msi_device_data_release+0x6c/0x9c CPU: 0 UID: 0 PID: 687 Comm: bash Not tainted 6.14.0-rc5+ #2 Call Trace: msi_device_data_release+0x34/0x9c (unreliable) release_nodes+0x64/0x13c devres_release_all+0xc0/0x140 device_del+0x2d4/0x46c pci_destroy_dev+0x5c/0x194 pci_hp_remove_devices+0x90/0x128 pci_hp_remove_devices+0x44/0x128 pnv_php_disable_slot+0x54/0xd4 power_write_file+0xf8/0x18c pci_slot_attr_store+0x40/0x5c sysfs_kf_write+0x64/0x78 kernfs_fop_write_iter+0x1b0/0x290 vfs_write+0x3bc/0x50c ksys_write+0x84/0x140 system_call_exception+0x124/0x230 system_call_vectored_common+0x15c/0x2ec

[bhelgaas: tidy comments]

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38624"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-08-22T16:15:35Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: pnv_php: Clean up allocated IRQs on unplug\n\nWhen the root of a nested PCIe bridge configuration is unplugged, the\npnv_php driver leaked the allocated IRQ resources for the child bridges\u0027\nhotplug event notifications, resulting in a panic.\n\nFix this by walking all child buses and deallocating all its IRQ resources\nbefore calling pci_hp_remove_devices().\n\nAlso modify the lifetime of the workqueue at struct pnv_php_slot::wq so\nthat it is only destroyed in pnv_php_free_slot(), instead of\npnv_php_disable_irq(). This is required since pnv_php_disable_irq() will\nnow be called by workers triggered by hot unplug interrupts, so the\nworkqueue needs to stay allocated.\n\nThe abridged kernel panic that occurs without this patch is as follows:\n\n  WARNING: CPU: 0 PID: 687 at kernel/irq/msi.c:292 msi_device_data_release+0x6c/0x9c\n  CPU: 0 UID: 0 PID: 687 Comm: bash Not tainted 6.14.0-rc5+ #2\n  Call Trace:\n   msi_device_data_release+0x34/0x9c (unreliable)\n   release_nodes+0x64/0x13c\n   devres_release_all+0xc0/0x140\n   device_del+0x2d4/0x46c\n   pci_destroy_dev+0x5c/0x194\n   pci_hp_remove_devices+0x90/0x128\n   pci_hp_remove_devices+0x44/0x128\n   pnv_php_disable_slot+0x54/0xd4\n   power_write_file+0xf8/0x18c\n   pci_slot_attr_store+0x40/0x5c\n   sysfs_kf_write+0x64/0x78\n   kernfs_fop_write_iter+0x1b0/0x290\n   vfs_write+0x3bc/0x50c\n   ksys_write+0x84/0x140\n   system_call_exception+0x124/0x230\n   system_call_vectored_common+0x15c/0x2ec\n\n[bhelgaas: tidy comments]",
  "id": "GHSA-m8vv-wrwx-6989",
  "modified": "2025-08-28T15:30:39Z",
  "published": "2025-08-22T18:31:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38624"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1773c19fa55e944cdd2634e2d9e552f87f2d38d5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/28aa3cfce12487614219e7667ec84424e1f43227"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/32173edf3fe2d447e14e5e3b299387c6f9602a88"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/398170b7fd0e0db2f8096df5206c75e5ff41415a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4668619092554e1b95c9a5ac2941ca47ba6d548a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8c1ad4af160691e157d688ad9619ced2df556aac"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/912e200240b6f9758f0b126e64a61c9227f4ad37"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bbd302c4b79df10197ffa7270ca3aa572eeca33c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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