{"id":"DEBIAN-CVE-2022-49434","details":"In the Linux kernel, the following vulnerability has been resolved:  PCI: Avoid pci_dev_lock() AB/BA deadlock with sriov_numvfs_store()  The sysfs sriov_numvfs_store() path acquires the device lock before the config space access lock:    sriov_numvfs_store     device_lock                 # A (1) acquire device lock     sriov_configure       vfio_pci_sriov_configure  # (for example)         vfio_pci_core_sriov_configure           pci_disable_sriov             sriov_disable               pci_cfg_access_lock                 pci_wait_cfg    # B (4) wait for dev-\u003eblock_cfg_access == 0  Previously, pci_dev_lock() acquired the config space access lock before the device lock:    pci_dev_lock     pci_cfg_access_lock       dev-\u003eblock_cfg_access = 1 # B (2) set dev-\u003eblock_cfg_access = 1     device_lock                 # A (3) wait for device lock  Any path that uses pci_dev_lock(), e.g., pci_reset_function(), may deadlock with sriov_numvfs_store() if the operations occur in the sequence (1) (2) (3) (4).  Avoid the deadlock by reversing the order in pci_dev_lock() so it acquires the device lock before the config space access lock, the same as the sriov_numvfs_store() path.  [bhelgaas: combined and adapted commit log from Jay Zhou's independent subsequent posting: https://lore.kernel.org/r/20220404062539.1710-1-jianjay.zhou@huawei.com]","modified":"2026-09-01T16:05:32.085140362Z","published":"2025-02-26T07:01:19.863Z","upstream":["CVE-2022-49434"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-49434"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.18.5-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49434.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.18.5-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49434.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.18.5-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49434.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}