CVE-2025-38624

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]

Affected Software

References

• https://git.kernel.org/stable/c/1773c19fa55e944cdd2634e2d9e552f87f2d38d5
• https://git.kernel.org/stable/c/28aa3cfce12487614219e7667ec84424e1f43227
• https://git.kernel.org/stable/c/32173edf3fe2d447e14e5e3b299387c6f9602a88
• https://git.kernel.org/stable/c/398170b7fd0e0db2f8096df5206c75e5ff41415a
• https://git.kernel.org/stable/c/4668619092554e1b95c9a5ac2941ca47ba6d548a
• https://git.kernel.org/stable/c/8c1ad4af160691e157d688ad9619ced2df556aac
• https://git.kernel.org/stable/c/912e200240b6f9758f0b126e64a61c9227f4ad37
• https://git.kernel.org/stable/c/bbd302c4b79df10197ffa7270ca3aa572eeca33c