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CVE-2025-39827

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: net: rose: include node references in rose_neigh refcount Current implementation maintains two separate reference counting mechanisms: the 'count' field in struct rose_neigh tracks references from rose_node structures, while the 'use' field (now refcount_t) tracks references from rose_sock. This patch merges these two reference counting systems using 'use' field for proper reference management. Specifically, this patch adds incrementing and decrementing of rose_neigh->use when rose_neigh->count is incremented or decremented. This patch also modifies rose_rt_free(), rose_rt_device_down() and rose_clear_route() to properly release references to rose_neigh objects before freeing a rose_node through rose_remove_node(). These changes ensure rose_neigh structures are properly freed only when all references, including those from rose_node structures, are released. As a result, this resolves a slab-use-after-free issue reported by Syzbot.

Severity
MEDIUM
CVSS score
5.5 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-09-16 13:16:02.873000
Last modified
2026-10-19 21:10:00.160000
View original CVE JSON 
{
  "id": "CVE-2025-39827",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-09-16T13:16:02.873",
  "lastModified": "2026-10-19T21:10:00.160",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: rose: include node references in rose_neigh refcount\n\nCurrent implementation maintains two separate reference counting\nmechanisms: the 'count' field in struct rose_neigh tracks references from\nrose_node structures, while the 'use' field (now refcount_t) tracks\nreferences from rose_sock.\n\nThis patch merges these two reference counting systems using 'use' field\nfor proper reference management. Specifically, this patch adds incrementing\nand decrementing of rose_neigh->use when rose_neigh->count is incremented\nor decremented.\n\nThis patch also modifies rose_rt_free(), rose_rt_device_down() and\nrose_clear_route() to properly release references to rose_neigh objects\nbefore freeing a rose_node through rose_remove_node().\n\nThese changes ensure rose_neigh structures are properly freed only when\nall references, including those from rose_node structures, are released.\nAs a result, this resolves a slab-use-after-free issue reported by Syzbot."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: rose: incluir referencias de nodo en el recuento de referencias de rose_neigh\n\nLa implementación actual mantiene dos mecanismos de recuento de referencias separados: el campo 'count' en la estructura rose_neigh rastrea las referencias de las estructuras rose_node, mientras que el campo 'use' (ahora refcount_t) rastrea las referencias de rose_sock.\n\nEste parche fusiona estos dos sistemas de recuento de referencias utilizando el campo 'use' para una gestión adecuada de las referencias. Específicamente, este parche añade el incremento y decremento de rose_neigh->use cuando rose_neigh->count es incrementado o decrementado.\n\nEste parche también modifica rose_rt_free(), rose_rt_device_down() y rose_clear_route() para liberar correctamente las referencias a los objetos rose_neigh antes de liberar un rose_node a través de rose_remove_node().\n\nEstos cambios aseguran que las estructuras rose_neigh sean liberadas correctamente solo cuando todas las referencias, incluidas las de las estructuras rose_node, sean liberadas. Como resultado, esto resuelve un problema de slab-uso después de liberación reportado por Syzbot."
    }
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