FKIE_CVE-2026-43147

Vulnerability from fkie_nvd - Published: 2026-05-06 12:16 - Updated: 2026-05-13 20:18
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0de341b2365bad430aade0853fe09c2cbe468f59Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2fa119c0e5e528453ebae9e70740e8d2d8c0ed5aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/40f67686a5002c0c322fac918406bbc8d9c2ec2fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/58677783c89681871077f50a7042b0c6380c4fd8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/639265296fe6ee21b6f00e00ee2bab65f3b07252Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/83651d37474c762920e345a3a0828f975ca4d732Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d47f27e145f8bd13f3c230da5e3af29225b4a2f7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f61cdd7e9b67bb8961b0a81bf294b78343e5db05Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

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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 \u003cNUM\u003e \u003e /sys/bus/pci/devices/\u003cpf\u003e/sriov_numvfs\n  $ echo 1 \u003e /sys/bus/pci/devices/\u003cpf\u003e/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   [\u003c00000259778c4f90\u003e] dump_stack_lvl+0xc0/0x110\n   [\u003c00000259779c844e\u003e] print_deadlock_bug+0x31e/0x330\n   [\u003c00000259779c1908\u003e] __lock_acquire+0x16c8/0x32f0\n   [\u003c00000259779bffac\u003e] lock_acquire+0x14c/0x350\n   [\u003c00000259789643a6\u003e] __mutex_lock_common+0xe6/0x1520\n   [\u003c000002597896413c\u003e] mutex_lock_nested+0x3c/0x50\n   [\u003c00000259784a07e4\u003e] sriov_disable+0x34/0x140\n   [\u003c00000258f7d6dd80\u003e] mlx5_sriov_disable+0x50/0x80 [mlx5_core]\n   [\u003c00000258f7d5745e\u003e] remove_one+0x5e/0xf0 [mlx5_core]\n   [\u003c00000259784857fc\u003e] pci_device_remove+0x3c/0xa0\n   [\u003c000002597851012e\u003e] device_release_driver_internal+0x18e/0x280\n   [\u003c000002597847ae22\u003e] pci_stop_bus_device+0x82/0xa0\n   [\u003c000002597847afce\u003e] pci_stop_and_remove_bus_device_locked+0x5e/0x80\n   [\u003c00000259784972c2\u003e] remove_store+0x72/0x90\n   [\u003c0000025977e6661a\u003e] kernfs_fop_write_iter+0x15a/0x200\n   [\u003c0000025977d7241c\u003e] vfs_write+0x24c/0x300\n   [\u003c0000025977d72696\u003e] ksys_write+0x86/0x110\n   [\u003c000002597895b61c\u003e] __do_syscall+0x14c/0x400\n   [\u003c000002597896e0ee\u003e] 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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  "id": "CVE-2026-43147",
  "lastModified": "2026-05-13T20:18:47.387",
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          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
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          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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  "published": "2026-05-06T12:16:32.240",
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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