CVE-2025-39827

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.

• linux linux kernel (>= 2.6.12.1 < 6.1.150) • linux linux kernel (>= 6.2 < 6.6.104) • linux linux kernel (>= 6.7 < 6.12.45) • linux linux kernel (>= 6.13 < 6.16.5) • linux linux kernel 2.6.12 • linux linux kernel 6.17 • debian debian linux 11.0