CVE-2026-43147
Estado: AnalizadaMedia (5.5)—
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:
A trimmed trace of the deadlock on a mlx5 device is as below:
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.
Detalles técnicos trazas, registros y código del informe original
$ echo <NUM> > /sys/bus/pci/devices/<pf>/sriov_numvfs
$ echo 1 > /sys/bus/pci/devices/<pf>/remove
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/0x90CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.10%
- Percentil entre todas las CVEs puntuadas: 1
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- CWE-667
Referencias
- https://git.kernel.org/stable/c/0de341b2365bad430aade0853fe09c2cbe468f59
- https://git.kernel.org/stable/c/2fa119c0e5e528453ebae9e70740e8d2d8c0ed5a
- https://git.kernel.org/stable/c/40f67686a5002c0c322fac918406bbc8d9c2ec2f
- https://git.kernel.org/stable/c/58677783c89681871077f50a7042b0c6380c4fd8
- https://git.kernel.org/stable/c/639265296fe6ee21b6f00e00ee2bab65f3b07252
- https://git.kernel.org/stable/c/83651d37474c762920e345a3a0828f975ca4d732
- https://git.kernel.org/stable/c/d47f27e145f8bd13f3c230da5e3af29225b4a2f7
- https://git.kernel.org/stable/c/f61cdd7e9b67bb8961b0a81bf294b78343e5db05
JSON original (NVD)
Mostrar
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"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."
}
],
"lastModified": "2026-06-17T10:49:01.380",
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