{"id":"CVE-2025-40219","title":"PCI/IOV: Fix race between SR-IOV enable/disable and hotplug","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nPCI/IOV: Fix race between SR-IOV enable/disable and hotplug\n\nCommit 05703271c3cd (\"PCI/IOV: Add PCI rescan-remove locking when\nenabling/disabling SR-IOV\") tried to fix …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 18f9e9d150fccfa747875df6f0a9f606740762b3 < 3cddde484471c602bea04e6f384819d336a1ff84","Linux >= 18f9e9d150fccfa747875df6f0a9f606740762b3 < d7673ac466eca37ec3e6b7cc9ccdb06de3304e9b","Linux >= 18f9e9d150fccfa747875df6f0a9f606740762b3 < 7c37920c96b85ef4255a7acc795e99e63dd38d59","Linux >= 18f9e9d150fccfa747875df6f0a9f606740762b3 < 1047ca2d816994f31e1475e63e0c0b7825599747","Linux >= 18f9e9d150fccfa747875df6f0a9f606740762b3 < 97c18f074ff1c12d016a0753072a3afdfa0b9611","Linux >= 18f9e9d150fccfa747875df6f0a9f606740762b3 < bea1d373098b22d7142da48750ce5526096425bc","Linux >= 18f9e9d150fccfa747875df6f0a9f606740762b3 < f3015627b6e9ddf85cfeaf42405b3c194dde2c36","Linux >= 18f9e9d150fccfa747875df6f0a9f606740762b3 < a5338e365c4559d7b4d7356116b0eb95b12e08d5","Linux 5.0"],"published":"2025-12-04","updated":"2026-09-08","sourceUpdated":"2026-09-08T08:42:55.399Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-40219","references":[{"url":"https://git.kernel.org/stable/c/3cddde484471c602bea04e6f384819d336a1ff84"},{"url":"https://git.kernel.org/stable/c/d7673ac466eca37ec3e6b7cc9ccdb06de3304e9b"},{"url":"https://git.kernel.org/stable/c/7c37920c96b85ef4255a7acc795e99e63dd38d59"},{"url":"https://git.kernel.org/stable/c/1047ca2d816994f31e1475e63e0c0b7825599747"},{"url":"https://git.kernel.org/stable/c/97c18f074ff1c12d016a0753072a3afdfa0b9611"},{"url":"https://git.kernel.org/stable/c/bea1d373098b22d7142da48750ce5526096425bc"},{"url":"https://git.kernel.org/stable/c/f3015627b6e9ddf85cfeaf42405b3c194dde2c36"},{"url":"https://git.kernel.org/stable/c/a5338e365c4559d7b4d7356116b0eb95b12e08d5"}],"tags":["cve.org"],"epss":0.00224,"epssPercentile":0.13247,"ingestedAt":"2026-09-08T15:33:26.996Z","slug":"CVE-2025-40219","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nPCI/IOV: Fix race between SR-IOV enable/disable and hotplug\n\nCommit 05703271c3cd (\"PCI/IOV: Add PCI rescan-remove locking when\nenabling/disabling SR-IOV\") tried to fix a race between the VF removal\ninside sriov_del_vfs() and concurrent hot unplug by taking the PCI\nrescan/remove lock in sriov_del_vfs(). Similarly the PCI rescan/remove lock\nwas also taken in sriov_add_vfs() to protect addition of VFs.\n\nThis approach however causes deadlock on trying to remove PFs with SR-IOV\nenabled because PFs disable SR-IOV during removal and this removal happens\nunder the PCI rescan/remove lock. So the original fix had to be reverted.\n\nInstead of taking the PCI rescan/remove lock in sriov_add_vfs() and\nsriov_del_vfs(), fix the race that occurs with SR-IOV enable and disable vs\nhotplug higher up in the callchain by taking the lock in\nsriov_numvfs_store() before calling into the driver's sriov_configure()\ncallback.\n\n## Affected\n\n- `Linux >= 18f9e9d150fccfa747875df6f0a9f606740762b3 < 3cddde484471c602bea04e6f384819d336a1ff84`\n- `Linux >= 18f9e9d150fccfa747875df6f0a9f606740762b3 < d7673ac466eca37ec3e6b7cc9ccdb06de3304e9b`\n- `Linux >= 18f9e9d150fccfa747875df6f0a9f606740762b3 < 7c37920c96b85ef4255a7acc795e99e63dd38d59`\n- `Linux >= 18f9e9d150fccfa747875df6f0a9f606740762b3 < 1047ca2d816994f31e1475e63e0c0b7825599747`\n- `Linux >= 18f9e9d150fccfa747875df6f0a9f606740762b3 < 97c18f074ff1c12d016a0753072a3afdfa0b9611`\n- `Linux >= 18f9e9d150fccfa747875df6f0a9f606740762b3 < bea1d373098b22d7142da48750ce5526096425bc`\n- `Linux >= 18f9e9d150fccfa747875df6f0a9f606740762b3 < f3015627b6e9ddf85cfeaf42405b3c194dde2c36`\n- `Linux >= 18f9e9d150fccfa747875df6f0a9f606740762b3 < a5338e365c4559d7b4d7356116b0eb95b12e08d5`\n- `Linux 5.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}