{"id":"CVE-2022-50091","summary":"locking/csd_lock: Change csdlock_debug from early_param to __setup","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nlocking/csd_lock: Change csdlock_debug from early_param to __setup\n\nThe csdlock_debug kernel-boot parameter is parsed by the\nearly_param() function csdlock_debug().  If set, csdlock_debug()\ninvokes static_branch_enable() to enable csd_lock_wait feature, which\ntriggers a panic on arm64 for kernels built with CONFIG_SPARSEMEM=y and\nCONFIG_SPARSEMEM_VMEMMAP=n.\n\nWith CONFIG_SPARSEMEM_VMEMMAP=n, __nr_to_section is called in\nstatic_key_enable() and returns NULL, resulting in a NULL dereference\nbecause mem_section is initialized only later in sparse_init().\n\nThis is also a problem for powerpc because early_param() functions\nare invoked earlier than jump_label_init(), also resulting in\nstatic_key_enable() failures.  These failures cause the warning \"static\nkey 'xxx' used before call to jump_label_init()\".\n\nThus, early_param is too early for csd_lock_wait to run\nstatic_branch_enable(), so changes it to __setup to fix these.","modified":"2026-04-02T08:28:12.735990Z","published":"2025-06-18T11:02:30.729Z","related":["SUSE-SU-2025:02308-1","SUSE-SU-2025:02320-1","SUSE-SU-2025:02334-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50091.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/05de9e2e33b1625c71aee69e353fe906dd2be88a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9c9b26b0df270d4f9246e483a44686fca951a29c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b480d1e9a8c11ecc1c99dc01814b28e3103bd0a0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d2cbdbe22b5f190055d2d0ae92e7454479343a30"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50091.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50091"},{"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":"8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5"},{"fixed":"d2cbdbe22b5f190055d2d0ae92e7454479343a30"},{"fixed":"05de9e2e33b1625c71aee69e353fe906dd2be88a"},{"fixed":"b480d1e9a8c11ecc1c99dc01814b28e3103bd0a0"},{"fixed":"9c9b26b0df270d4f9246e483a44686fca951a29c"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50091.json"}}],"schema_version":"1.7.5"}