CVE-2022-50091
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: locking/csd_lock: Change csdlock_debug from early_param to __setup The csdlock_debug kernel-boot parameter is parsed by the early_param() function csdlock_debug(). If set, csdlock_debug() invokes static_branch_enable() to enable csd_lock_wait feature, which triggers a panic on arm64 for kernels built with CONFIG_SPARSEMEM=y and CONFIG_SPARSEMEM_VMEMMAP=n. With CONFIG_SPARSEMEM_VMEMMAP=n, __nr_to_section is called in static_key_enable() and returns NULL, resulting in a NULL dereference because mem_section is initialized only later in sparse_init(). This is also a problem for powerpc because early_param() functions are invoked earlier than jump_label_init(), also resulting in static_key_enable() failures. These failures cause the warning "static key 'xxx' used before call to jump_label_init()". Thus, early_param is too early for csd_lock_wait to run static_branch_enable(), so changes it to __setup to fix these.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-06-18 11:15:38.277000
Last modified
2026-11-05 20:17:23.400000
View original CVE JSON
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-06-18T11:15:38.277",
"lastModified": "2026-11-05T20:17:23.400",
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"value": "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."
},
{
"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 parámetro csdlock_debug kernel-boot es analizado por la función early_param() csdlock_debug(). Si se establece, csdlock_debug() invoca static_branch_enable() para habilitar la función csd_lock_wait, que desencadena un pánico 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 más tarde en sparse_init(). Esto también representa un problema para PowerPC, ya que las funciones early_param() se invocan antes que jump_label_init(), lo que también provoca fallos en static_key_enable(). Estos fallos generan la advertencia \"Clave estática '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."
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