{"cve":"CVE-2026-43147","nvd":{"published":"2026-05-06T12:16:32.240","modified":"2026-06-17T10:49:01.380","status":"Analyzed","description":"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 <NUM> > /sys/bus/pci/devices/<pf>/sriov_numvfs\n  $ echo 1 > /sys/bus/pci/devices/<pf>/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   [<00000259778c4f90>] dump_stack_lvl+0xc0/0x110\n   [<00000259779c844e>] print_deadlock_bug+0x31e/0x330\n   [<00000259779c1908>] __lock_acquire+0x16c8/0x32f0\n   [<00000259779bffac>] lock_acquire+0x14c/0x350\n   [<00000259789643a6>] __mutex_lock_common+0xe6/0x1520\n   [<000002597896413c>] mutex_lock_nested+0x3c/0x50\n   [<00000259784a07e4>] sriov_disable+0x34/0x140\n   [<00000258f7d6dd80>] mlx5_sriov_disable+0x50/0x80 [mlx5_core]\n   [<00000258f7d5745e>] remove_one+0x5e/0xf0 [mlx5_core]\n   [<00000259784857fc>] pci_device_remove+0x3c/0xa0\n   [<000002597851012e>] device_release_driver_internal+0x18e/0x280\n   [<000002597847ae22>] pci_stop_bus_device+0x82/0xa0\n   [<000002597847afce>] pci_stop_and_remove_bus_device_locked+0x5e/0x80\n   [<00000259784972c2>] remove_store+0x72/0x90\n   [<0000025977e6661a>] kernfs_fop_write_iter+0x15a/0x200\n   [<0000025977d7241c>] vfs_write+0x24c/0x300\n   [<0000025977d72696>] ksys_write+0x86/0x110\n   [<000002597895b61c>] __do_syscall+0x14c/0x400\n   [<000002597896e0ee>] 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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-667"],"references":["https://git.kernel.org/stable/c/0de341b2365bad430aade0853fe09c2cbe468f59","https://git.kernel.org/stable/c/2fa119c0e5e528453ebae9e70740e8d2d8c0ed5a","https://git.kernel.org/stable/c/40f67686a5002c0c322fac918406bbc8d9c2ec2f","https://git.kernel.org/stable/c/58677783c89681871077f50a7042b0c6380c4fd8","https://git.kernel.org/stable/c/639265296fe6ee21b6f00e00ee2bab65f3b07252"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:33:55.586217763+00:00"},"epss":{"cve":"CVE-2026-43147","score":0.00095,"percentile":0.00593,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}