{"id":"CVE-2026-43147","summary":"Revert \"PCI/IOV: Add PCI rescan-remove locking when enabling/disabling SR-IOV\"","details":"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.","modified":"2026-10-28T02:30:57.372336418Z","published":"2026-05-06T11:27:30.235Z","related":["SUSE-SU-2026:23066-1","SUSE-SU-2026:23068-1","SUSE-SU-2026:23193-1","SUSE-SU-2026:23194-1","SUSE-SU-2026:23221-1","SUSE-SU-2026:23231-1","SUSE-SU-2026:23237-1","SUSE-SU-2026:23241-1","SUSE-SU-2026:23244-1","SUSE-SU-2026:3130-1","SUSE-SU-2026:3166-1","SUSE-SU-2026:4369-1","openSUSE-SU-2026:21555-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43147.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0de341b2365bad430aade0853fe09c2cbe468f59"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2fa119c0e5e528453ebae9e70740e8d2d8c0ed5a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/40f67686a5002c0c322fac918406bbc8d9c2ec2f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/58677783c89681871077f50a7042b0c6380c4fd8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/639265296fe6ee21b6f00e00ee2bab65f3b07252"},{"type":"WEB","url":"https://git.kernel.org/stable/c/83651d37474c762920e345a3a0828f975ca4d732"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d47f27e145f8bd13f3c230da5e3af29225b4a2f7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f61cdd7e9b67bb8961b0a81bf294b78343e5db05"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43147.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43147"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1e8a80290f964bdbad225221c8a1594c7e01c8fd"},{"fixed":"f61cdd7e9b67bb8961b0a81bf294b78343e5db05"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a645ca21de09e3137cbb224fa6c23cca873a1d01"},{"fixed":"0de341b2365bad430aade0853fe09c2cbe468f59"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a24219172456f035d886857e265ca24c85b167c8"},{"fixed":"83651d37474c762920e345a3a0828f975ca4d732"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"36039348bca77828bf06eae41b8f76e38cd15847"},{"fixed":"639265296fe6ee21b6f00e00ee2bab65f3b07252"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"53154cd40ccf285f1d1c24367824082061d155bd"},{"fixed":"d47f27e145f8bd13f3c230da5e3af29225b4a2f7"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"05703271c3cdcc0f2a8cf6ebdc45892b8ca83520"},{"fixed":"40f67686a5002c0c322fac918406bbc8d9c2ec2f"},{"fixed":"58677783c89681871077f50a7042b0c6380c4fd8"},{"fixed":"2fa119c0e5e528453ebae9e70740e8d2d8c0ed5a"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.10.246"},{"fixed":"5.10.252"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.15.195"},{"fixed":"5.15.202"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.1.157"},{"fixed":"6.1.165"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.6.113"},{"fixed":"6.6.128"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.12.54"},{"fixed":"6.12.75"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.4.301"},{"fixed":"5.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.17.4"},{"fixed":"6.18"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5c1cd7d405e94dc6cb320cc0cc092b74895b6ddf"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ee40e5db052d7c6f406fdb95ad639c894c74674c"}]}],"versions":["v5.10.251","v5.10.250","v5.10.249","v5.10.248","v5.10.247","v5.10.246","v5.15.201","v5.15.200","v5.15.199","v5.15.198","v5.15.197","v5.15.196","v5.15.195","v6.1.164","v6.1.163","v6.1.162","v6.1.161","v6.1.160","v6.1.159","v6.1.158","v6.1.157","v6.6.127","v6.6.126","v6.6.125","v6.6.124","v6.6.123","v6.6.122","v6.6.121","v6.6.120","v6.6.119","v6.6.118","v6.6.117","v6.6.116","v6.6.115","v6.6.114","v6.6.113","v6.12.74","v6.12.73","v6.12.72","v6.12.71","v6.12.70","v6.12.69","v6.12.68","v6.12.67","v6.12.66","v6.12.65","v6.12.64","v6.12.63","v6.12.62","v6.12.61","v6.12.60","v6.12.59","v6.12.58","v6.12.57","v6.12.56","v6.12.55","v6.12.54","v5.4.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