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

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Summary

CVECVE-2026-43147
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 12:16:32 UTC
Updated2026-05-13 20:18:47 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-667

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1e8a80290f964bdbad225221c8a1594c7e01c8fd f61cdd7e9b67bb8961b0a81bf294b78343e5db05 git Not specified
CNA Linux Linux affected a645ca21de09e3137cbb224fa6c23cca873a1d01 0de341b2365bad430aade0853fe09c2cbe468f59 git Not specified
CNA Linux Linux affected a24219172456f035d886857e265ca24c85b167c8 83651d37474c762920e345a3a0828f975ca4d732 git Not specified
CNA Linux Linux affected 36039348bca77828bf06eae41b8f76e38cd15847 639265296fe6ee21b6f00e00ee2bab65f3b07252 git Not specified
CNA Linux Linux affected 53154cd40ccf285f1d1c24367824082061d155bd d47f27e145f8bd13f3c230da5e3af29225b4a2f7 git Not specified
CNA Linux Linux affected 05703271c3cdcc0f2a8cf6ebdc45892b8ca83520 40f67686a5002c0c322fac918406bbc8d9c2ec2f git Not specified
CNA Linux Linux affected 05703271c3cdcc0f2a8cf6ebdc45892b8ca83520 58677783c89681871077f50a7042b0c6380c4fd8 git Not specified
CNA Linux Linux affected 05703271c3cdcc0f2a8cf6ebdc45892b8ca83520 2fa119c0e5e528453ebae9e70740e8d2d8c0ed5a git Not specified
CNA Linux Linux affected 5c1cd7d405e94dc6cb320cc0cc092b74895b6ddf git Not specified
CNA Linux Linux affected ee40e5db052d7c6f406fdb95ad639c894c74674c git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 5.10.252 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.202 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.165 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.128 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.75 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.16 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.6 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/83651d37474c762920e345a3a0828f975ca4d732 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2fa119c0e5e528453ebae9e70740e8d2d8c0ed5a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f61cdd7e9b67bb8961b0a81bf294b78343e5db05 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/40f67686a5002c0c322fac918406bbc8d9c2ec2f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/58677783c89681871077f50a7042b0c6380c4fd8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d47f27e145f8bd13f3c230da5e3af29225b4a2f7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/639265296fe6ee21b6f00e00ee2bab65f3b07252 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0de341b2365bad430aade0853fe09c2cbe468f59 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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