{"id":"CVE-2023-54323","summary":"cxl/pmem: Fix nvdimm registration races","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/pmem: Fix nvdimm registration races\n\nA loop of the form:\n\n    while true; do modprobe cxl_pci; modprobe -r cxl_pci; done\n\n...fails with the following crash signature:\n\n    BUG: kernel NULL pointer dereference, address: 0000000000000040\n    [..]\n    RIP: 0010:cxl_internal_send_cmd+0x5/0xb0 [cxl_core]\n    [..]\n    Call Trace:\n     \u003cTASK\u003e\n     cxl_pmem_ctl+0x121/0x240 [cxl_pmem]\n     nvdimm_get_config_data+0xd6/0x1a0 [libnvdimm]\n     nd_label_data_init+0x135/0x7e0 [libnvdimm]\n     nvdimm_probe+0xd6/0x1c0 [libnvdimm]\n     nvdimm_bus_probe+0x7a/0x1e0 [libnvdimm]\n     really_probe+0xde/0x380\n     __driver_probe_device+0x78/0x170\n     driver_probe_device+0x1f/0x90\n     __device_attach_driver+0x85/0x110\n     bus_for_each_drv+0x7d/0xc0\n     __device_attach+0xb4/0x1e0\n     bus_probe_device+0x9f/0xc0\n     device_add+0x445/0x9c0\n     nd_async_device_register+0xe/0x40 [libnvdimm]\n     async_run_entry_fn+0x30/0x130\n\n...namely that the bottom half of async nvdimm device registration runs\nafter the CXL has already torn down the context that cxl_pmem_ctl()\nneeds. Unlike the ACPI NFIT case that benefits from launching multiple\nnvdimm device registrations in parallel from those listed in the table,\nCXL is already marked PROBE_PREFER_ASYNCHRONOUS. So provide for a\nsynchronous registration path to preclude this scenario.","modified":"2026-03-20T12:33:33.308582Z","published":"2025-12-30T12:37:07.656Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54323.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/18c65667fa9104780eeaa0dc1bc240f0c2094772"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a371788d4f4a7f59eecd22644331d599979fd283"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f57aec443c24d2e8e1f3b5b4856aea12ddda4254"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54323.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-54323"},{"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":"21083f51521fb0f60dbac591f175c3ed48435af4"},{"fixed":"a371788d4f4a7f59eecd22644331d599979fd283"},{"fixed":"18c65667fa9104780eeaa0dc1bc240f0c2094772"},{"fixed":"f57aec443c24d2e8e1f3b5b4856aea12ddda4254"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-54323.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.14.0"},{"fixed":"6.1.16"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.2.3"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-54323.json"}}],"schema_version":"1.7.5"}