CVE-2026-43147

MEDIUM EPSS 0.8%
Published May 6, 20261mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published May 6, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
0.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-667

Affected Products 8

VendorProductVersionRange
linuxlinux_kernel*≥5.4.301  –  <5.5
linuxlinux_kernel*≥5.10.246  –  <5.10.252
linuxlinux_kernel*≥5.15.195  –  <5.15.202
linuxlinux_kernel*≥6.1.157  –  <6.1.165
linuxlinux_kernel*≥6.6.113  –  <6.6.128
linuxlinux_kernel*≥6.12.54  –  <6.12.75
linuxlinux_kernel*≥6.17.4  –  <6.18.16
linuxlinux_kernel*≥6.19  –  <6.19.6

References 8

  • git.kernel.org https://git.kernel.org/stable/c/0de341b2365bad430aade0853fe09c2cbe468f59
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2fa119c0e5e528453ebae9e70740e8d2d8c0ed5a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/40f67686a5002c0c322fac918406bbc8d9c2ec2f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/58677783c89681871077f50a7042b0c6380c4fd8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/639265296fe6ee21b6f00e00ee2bab65f3b07252
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/83651d37474c762920e345a3a0828f975ca4d732
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d47f27e145f8bd13f3c230da5e3af29225b4a2f7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f61cdd7e9b67bb8961b0a81bf294b78343e5db05
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/0de341b2365bad430aade0853fe09c2cbe468f59
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2fa119c0e5e528453ebae9e70740e8d2d8c0ed5a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/40f67686a5002c0c322fac918406bbc8d9c2ec2f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/58677783c89681871077f50a7042b0c6380c4fd8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/639265296fe6ee21b6f00e00ee2bab65f3b07252
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/83651d37474c762920e345a3a0828f975ca4d732
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d47f27e145f8bd13f3c230da5e3af29225b4a2f7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f61cdd7e9b67bb8961b0a81bf294b78343e5db05
    Patch