CVE-2025-39826

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.