{"id":"CVE-2024-41085","summary":"cxl/mem: Fix no cxl_nvd during pmem region auto-assembling","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/mem: Fix no cxl_nvd during pmem region auto-assembling\n\nWhen CXL subsystem is auto-assembling a pmem region during cxl\nendpoint port probing, always hit below calltrace.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000078\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n RIP: 0010:cxl_pmem_region_probe+0x22e/0x360 [cxl_pmem]\n Call Trace:\n  \u003cTASK\u003e\n  ? __die+0x24/0x70\n  ? page_fault_oops+0x82/0x160\n  ? do_user_addr_fault+0x65/0x6b0\n  ? exc_page_fault+0x7d/0x170\n  ? asm_exc_page_fault+0x26/0x30\n  ? cxl_pmem_region_probe+0x22e/0x360 [cxl_pmem]\n  ? cxl_pmem_region_probe+0x1ac/0x360 [cxl_pmem]\n  cxl_bus_probe+0x1b/0x60 [cxl_core]\n  really_probe+0x173/0x410\n  ? __pfx___device_attach_driver+0x10/0x10\n  __driver_probe_device+0x80/0x170\n  driver_probe_device+0x1e/0x90\n  __device_attach_driver+0x90/0x120\n  bus_for_each_drv+0x84/0xe0\n  __device_attach+0xbc/0x1f0\n  bus_probe_device+0x90/0xa0\n  device_add+0x51c/0x710\n  devm_cxl_add_pmem_region+0x1b5/0x380 [cxl_core]\n  cxl_bus_probe+0x1b/0x60 [cxl_core]\n\nThe cxl_nvd of the memdev needs to be available during the pmem region\nprobe. Currently the cxl_nvd is registered after the endpoint port probe.\nThe endpoint probe, in the case of autoassembly of regions, can cause a\npmem region probe requiring the not yet available cxl_nvd. Adjust the\nsequence so this dependency is met.\n\nThis requires adding a port parameter to cxl_find_nvdimm_bridge() that\ncan be used to query the ancestor root port. The endpoint port is not\nyet available, but will share a common ancestor with its parent, so\nstart the query from there instead.","modified":"2026-04-02T12:17:25.851499Z","published":"2024-07-29T15:48:01.267Z","related":["SUSE-SU-2025:02254-1","SUSE-SU-2025:02307-1","SUSE-SU-2025:02333-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/41xxx/CVE-2024-41085.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1d064e4fbebcf5b18dc10c1f3973487eb163b600"},{"type":"WEB","url":"https://git.kernel.org/stable/c/84ec985944ef34a34a1605b93ce401aa8737af96"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/41xxx/CVE-2024-41085.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-41085"},{"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":"f17b558d6663101f876a1d9cbbad3de0c8f4ce4d"},{"fixed":"1d064e4fbebcf5b18dc10c1f3973487eb163b600"},{"fixed":"84ec985944ef34a34a1605b93ce401aa8737af96"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-41085.json"}}],"schema_version":"1.7.5"}