CVE-2022-50091

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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."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: locking/csd_lock: Cambiar csdlock_debug de early_param a __setup El par\u00e1metro csdlock_debug kernel-boot es analizado por la funci\u00f3n early_param() csdlock_debug(). Si se establece, csdlock_debug() invoca static_branch_enable() para habilitar la funci\u00f3n csd_lock_wait, que desencadena un p\u00e1nico en arm64 para kernels compilados con CONFIG_SPARSEMEM=y y CONFIG_SPARSEMEM_VMEMMAP=n. Con CONFIG_SPARSEMEM_VMEMMAP=n, se llama a __nr_to_section en static_key_enable() y devuelve NULL, lo que resulta en una desreferencia NULL porque mem_section se inicializa solo m\u00e1s tarde en sparse_init(). Esto tambi\u00e9n representa un problema para PowerPC, ya que las funciones early_param() se invocan antes que jump_label_init(), lo que tambi\u00e9n provoca fallos en static_key_enable(). Estos fallos generan la advertencia \"Clave est\u00e1tica 'xxx' usada antes de la llamada a jump_label_init()\". Por lo tanto, early_param es demasiado pronto para que csd_lock_wait ejecute static_branch_enable(), por lo que se cambia a __setup para solucionarlos."}], "id": "CVE-2022-50091", "lastModified": "2026-11-05T20:17:23.400", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-50091", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T19:54:21.275116Z", "version": "2.0.3"}}]}, "published": "2025-06-18T11:15:38.277", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/05de9e2e33b1625c71aee69e353fe906dd2be88a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9c9b26b0df270d4f9246e483a44686fca951a29c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b480d1e9a8c11ecc1c99dc01814b28e3103bd0a0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d2cbdbe22b5f190055d2d0ae92e7454479343a30"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: locking/csd_lock: Change csdlock_debug from early_param to __setup", "id": "2373532", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2373532"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nlocking/csd_lock: Change csdlock_debug from early_param to __setup\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.\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().\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()\".\nThus, early_param is too early for csd_lock_wait to run\nstatic_branch_enable(), so changes it to __setup to fix these."], "name": "CVE-2022-50091", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-06-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-50091\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-50091\nhttps://lore.kernel.org/linux-cve-announce/2025061800-CVE-2022-50091-fddc@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-06-23T08:36:33.604121+00:00", "updated": "2025-06-23T08:36:33.604238+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}