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CVE-2026-22991

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: libceph: make free_choose_arg_map() resilient to partial allocation free_choose_arg_map() may dereference a NULL pointer if its caller fails after a partial allocation. For example, in decode_choose_args(), if allocation of arg_map->args fails, execution jumps to the fail label and free_choose_arg_map() is called. Since arg_map->size is updated to a non-zero value before memory allocation, free_choose_arg_map() will iterate over arg_map->args and dereference a NULL pointer. To prevent this potential NULL pointer dereference and make free_choose_arg_map() more resilient, add checks for pointers before iterating.

Severity
MEDIUM
CVSS score
5.5 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-01-23 16:15:55.183000
Last modified
2026-10-19 19:17:30.783000
View original CVE JSON 
{
  "id": "CVE-2026-22991",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-01-23T16:15:55.183",
  "lastModified": "2026-10-19T19:17:30.783",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: make free_choose_arg_map() resilient to partial allocation\n\nfree_choose_arg_map() may dereference a NULL pointer if its caller fails\nafter a partial allocation.\n\nFor example, in decode_choose_args(), if allocation of arg_map->args\nfails, execution jumps to the fail label and free_choose_arg_map() is\ncalled. Since arg_map->size is updated to a non-zero value before memory\nallocation, free_choose_arg_map() will iterate over arg_map->args and\ndereference a NULL pointer.\n\nTo prevent this potential NULL pointer dereference and make\nfree_choose_arg_map() more resilient, add checks for pointers before\niterating."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nlibceph: hacer free_choose_arg_map() resistente a la asignación parcial\n\nfree_choose_arg_map() puede desreferenciar un puntero NULL si su llamador falla después de una asignación parcial.\n\nPor ejemplo, en decode_choose_args(), si la asignación de arg_map->args falla, la ejecución salta a la etiqueta fail y se llama a free_choose_arg_map(). Dado que arg_map->size se actualiza a un valor distinto de cero antes de la asignación de memoria, free_choose_arg_map() iterará sobre arg_map->args y desreferenciará un puntero NULL.\n\nPara evitar esta potencial desreferencia de puntero NULL y hacer free_choose_arg_map() más resistente, añadir comprobaciones para los punteros antes de iterar."
    }
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