CVE-2026-43147

Revert "PCI/IOV: Add PCI rescan-remove locking when enabling/disabling SR-IOV"

State: Published
Severity: Not scored
Published: May 6, 2026
Updated: May 23, 2026
Reserved: May 1, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	1e8a80290f964bdbad225221c8a1594c7e01c8fd to before f61cdd7e9b67bb8961b0a81bf294b78343e5db05Affected a645ca21de09e3137cbb224fa6c23cca873a1d01 to before 0de341b2365bad430aade0853fe09c2cbe468f59Affected a24219172456f035d886857e265ca24c85b167c8 to before 83651d37474c762920e345a3a0828f975ca4d732Affected 36039348bca77828bf06eae41b8f76e38cd15847 to before 639265296fe6ee21b6f00e00ee2bab65f3b07252Affected 53154cd40ccf285f1d1c24367824082061d155bd to before d47f27e145f8bd13f3c230da5e3af29225b4a2f7Affected 05703271c3cdcc0f2a8cf6ebdc45892b8ca83520 to before 40f67686a5002c0c322fac918406bbc8d9c2ec2fAffected 05703271c3cdcc0f2a8cf6ebdc45892b8ca83520 to before 58677783c89681871077f50a7042b0c6380c4fd8Affected 05703271c3cdcc0f2a8cf6ebdc45892b8ca83520 to before 2fa119c0e5e528453ebae9e70740e8d2d8c0ed5aAffected 5c1cd7d405e94dc6cb320cc0cc092b74895b6ddfAffected ee40e5db052d7c6f406fdb95ad639c894c74674cAffected 5.10.246 to before 5.10.252Affected 5.15.195 to before 5.15.202Affected 6.1.157 to before 6.1.165Affected 6.6.113 to before 6.6.128Affected 6.12.54 to before 6.12.75Affected 5.4.301 to before 5.5Affected 6.17.4 to before 6.18Affected
LinuxLinux	6.18Affected before 6.18Not affected 5.10.252 through 5.10.Not affected 5.15.202 through 5.15.Not affected 6.1.165 through 6.1.Not affected 6.6.128 through 6.6.Not affected 6.12.75 through 6.12.Not affected 6.18.16 through 6.18.Not affected 6.19.6 through 6.19.*Not affected 7.0 and laterNot affected

Product

Versions

LinuxLinux

1e8a80290f964bdbad225221c8a1594c7e01c8fd to before f61cdd7e9b67bb8961b0a81bf294b78343e5db05Affected
a645ca21de09e3137cbb224fa6c23cca873a1d01 to before 0de341b2365bad430aade0853fe09c2cbe468f59Affected
a24219172456f035d886857e265ca24c85b167c8 to before 83651d37474c762920e345a3a0828f975ca4d732Affected
36039348bca77828bf06eae41b8f76e38cd15847 to before 639265296fe6ee21b6f00e00ee2bab65f3b07252Affected
53154cd40ccf285f1d1c24367824082061d155bd to before d47f27e145f8bd13f3c230da5e3af29225b4a2f7Affected
05703271c3cdcc0f2a8cf6ebdc45892b8ca83520 to before 40f67686a5002c0c322fac918406bbc8d9c2ec2fAffected
05703271c3cdcc0f2a8cf6ebdc45892b8ca83520 to before 58677783c89681871077f50a7042b0c6380c4fd8Affected
05703271c3cdcc0f2a8cf6ebdc45892b8ca83520 to before 2fa119c0e5e528453ebae9e70740e8d2d8c0ed5aAffected
5c1cd7d405e94dc6cb320cc0cc092b74895b6ddfAffected
ee40e5db052d7c6f406fdb95ad639c894c74674cAffected
5.10.246 to before 5.10.252Affected
5.15.195 to before 5.15.202Affected
6.1.157 to before 6.1.165Affected
6.6.113 to before 6.6.128Affected
6.12.54 to before 6.12.75Affected
5.4.301 to before 5.5Affected
6.17.4 to before 6.18Affected

LinuxLinux

6.18Affected
before 6.18Not affected
5.10.252 through 5.10.*Not affected
5.15.202 through 5.15.*Not affected
6.1.165 through 6.1.*Not affected
6.6.128 through 6.6.*Not affected
6.12.75 through 6.12.*Not affected
6.18.16 through 6.18.*Not affected
6.19.6 through 6.19.*Not affected
7.0 and laterNot affected

References

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