CVE-2025-39826
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: net: rose: convert 'use' field to refcount_t The 'use' field in struct rose_neigh is used as a reference counter but lacks atomicity. This can lead to race conditions where a rose_neigh structure is freed while still being referenced by other code paths. For example, when rose_neigh->use becomes zero during an ioctl operation via rose_rt_ioctl(), the structure may be removed while its timer is still active, potentially causing use-after-free issues. This patch changes the type of 'use' from unsigned short to refcount_t and updates all code paths to use rose_neigh_hold() and rose_neigh_put() which operate reference counts atomically.
Severity
HIGH
CVSS score
7.0
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-09-16 13:16:02.290000
Last modified
2026-10-19 21:10:00.160000
View original CVE JSON
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-09-16T13:16:02.290",
"lastModified": "2026-10-19T21:10:00.160",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: rose: convert 'use' field to refcount_t\n\nThe 'use' field in struct rose_neigh is used as a reference counter but\nlacks atomicity. This can lead to race conditions where a rose_neigh\nstructure is freed while still being referenced by other code paths.\n\nFor example, when rose_neigh->use becomes zero during an ioctl operation\nvia rose_rt_ioctl(), the structure may be removed while its timer is\nstill active, potentially causing use-after-free issues.\n\nThis patch changes the type of 'use' from unsigned short to refcount_t and\nupdates all code paths to use rose_neigh_hold() and rose_neigh_put() which\noperate reference counts atomically."
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"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: rose: convertir el campo 'use' a refcount_t\n\nEl campo 'use' en la estructura rose_neigh se utiliza como un contador de referencias pero carece de atomicidad. Esto puede llevar a condiciones de carrera donde una estructura rose_neigh es liberada mientras aún está siendo referenciada por otras rutas de código.\n\nPor ejemplo, cuando rose_neigh->use llega a cero durante una operación ioctl a través de rose_rt_ioctl(), la estructura puede ser eliminada mientras su temporizador aún está activo, potencialmente causando problemas de uso después de liberación.\n\nEste parche cambia el tipo de 'use' de unsigned short a refcount_t y actualiza todas las rutas de código para usar rose_neigh_hold() y rose_neigh_put() que operan los contadores de referencias de forma atómica."
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