CVE-2026-43147
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: Revert "PCI/IOV: Add PCI rescan-remove locking when enabling/disabling SR-IOV" This reverts commit 05703271c3cd ("PCI/IOV: Add PCI rescan-remove locking when enabling/disabling SR-IOV"), which causes a deadlock by recursively taking pci_rescan_remove_lock when sriov_del_vfs() is called as part of pci_stop_and_remove_bus_device(). For example with the following sequence of commands: $ echo <NUM> > /sys/bus/pci/devices/<pf>/sriov_numvfs $ echo 1 > /sys/bus/pci/devices/<pf>/remove A trimmed trace of the deadlock on a mlx5 device is as below: zsh/5715 is trying to acquire lock: 000002597926ef50 (pci_rescan_remove_lock){+.+.}-{3:3}, at: sriov_disable+0x34/0x140 but task is already holding lock: 000002597926ef50 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_stop_and_remove_bus_device_locked+0x24/0x80 ... Call Trace: [<00000259778c4f90>] dump_stack_lvl+0xc0/0x110 [<00000259779c844e>] print_deadlock_bug+0x31e/0x330 [<00000259779c1908>] __lock_acquire+0x16c8/0x32f0 [<00000259779bffac>] lock_acquire+0x14c/0x350 [<00000259789643a6>] __mutex_lock_common+0xe6/0x1520 [<000002597896413c>] mutex_lock_nested+0x3c/0x50 [<00000259784a07e4>] sriov_disable+0x34/0x140 [<00000258f7d6dd80>] mlx5_sriov_disable+0x50/0x80 [mlx5_core] [<00000258f7d5745e>] remove_one+0x5e/0xf0 [mlx5_core] [<00000259784857fc>] pci_device_remove+0x3c/0xa0 [<000002597851012e>] device_release_driver_internal+0x18e/0x280 [<000002597847ae22>] pci_stop_bus_device+0x82/0xa0 [<000002597847afce>] pci_stop_and_remove_bus_device_locked+0x5e/0x80 [<00000259784972c2>] remove_store+0x72/0x90 [<0000025977e6661a>] kernfs_fop_write_iter+0x15a/0x200 [<0000025977d7241c>] vfs_write+0x24c/0x300 [<0000025977d72696>] ksys_write+0x86/0x110 [<000002597895b61c>] __do_syscall+0x14c/0x400 [<000002597896e0ee>] system_call+0x6e/0x90 This alone is not a complete fix as it restores the issue the cited commit tried to solve. A new fix will be provided as a follow on.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-05-06 12:16:32.240000
Last modified
2026-11-06 16:18:25.303000
View original CVE JSON
{
"id": "CVE-2026-43147",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-05-06T12:16:32.240",
"lastModified": "2026-11-06T16:18:25.303",
"vulnStatus": "Analyzed",
"cveTags": [],
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRevert \"PCI/IOV: Add PCI rescan-remove locking when enabling/disabling SR-IOV\"\n\nThis reverts commit 05703271c3cd (\"PCI/IOV: Add PCI rescan-remove locking\nwhen enabling/disabling SR-IOV\"), which causes a deadlock by recursively\ntaking pci_rescan_remove_lock when sriov_del_vfs() is called as part of\npci_stop_and_remove_bus_device(). For example with the following sequence\nof commands:\n\n $ echo <NUM> > /sys/bus/pci/devices/<pf>/sriov_numvfs\n $ echo 1 > /sys/bus/pci/devices/<pf>/remove\n\nA trimmed trace of the deadlock on a mlx5 device is as below:\n\n zsh/5715 is trying to acquire lock:\n 000002597926ef50 (pci_rescan_remove_lock){+.+.}-{3:3}, at: sriov_disable+0x34/0x140\n\n but task is already holding lock:\n 000002597926ef50 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_stop_and_remove_bus_device_locked+0x24/0x80\n ...\n Call Trace:\n [<00000259778c4f90>] dump_stack_lvl+0xc0/0x110\n [<00000259779c844e>] print_deadlock_bug+0x31e/0x330\n [<00000259779c1908>] __lock_acquire+0x16c8/0x32f0\n [<00000259779bffac>] lock_acquire+0x14c/0x350\n [<00000259789643a6>] __mutex_lock_common+0xe6/0x1520\n [<000002597896413c>] mutex_lock_nested+0x3c/0x50\n [<00000259784a07e4>] sriov_disable+0x34/0x140\n [<00000258f7d6dd80>] mlx5_sriov_disable+0x50/0x80 [mlx5_core]\n [<00000258f7d5745e>] remove_one+0x5e/0xf0 [mlx5_core]\n [<00000259784857fc>] pci_device_remove+0x3c/0xa0\n [<000002597851012e>] device_release_driver_internal+0x18e/0x280\n [<000002597847ae22>] pci_stop_bus_device+0x82/0xa0\n [<000002597847afce>] pci_stop_and_remove_bus_device_locked+0x5e/0x80\n [<00000259784972c2>] remove_store+0x72/0x90\n [<0000025977e6661a>] kernfs_fop_write_iter+0x15a/0x200\n [<0000025977d7241c>] vfs_write+0x24c/0x300\n [<0000025977d72696>] ksys_write+0x86/0x110\n [<000002597895b61c>] __do_syscall+0x14c/0x400\n [<000002597896e0ee>] system_call+0x6e/0x90\n\nThis alone is not a complete fix as it restores the issue the cited commit\ntried to solve. A new fix will be provided as a follow on."
}
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"privilegesRequired": "LOW",
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"type": "Primary",
"description": [
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