{"id":"CVE-2025-39827","title":"net: rose: include node references in rose_neigh refcount","summary":"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…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 4cce478c3e82a5fc788d72adb2f4c4e983997639","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9c547c8eee9d1cf6e744611d688b9f725cf9a115","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d7563b456ed44151e1a82091d96f60166daea89b","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 384210cceb1873a4c8218b27ba0745444436b728","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < da9c9c877597170b929a6121a68dcd3dd9a80f45","Linux 2.6.12"],"published":"2025-09-16","updated":"2026-09-08","sourceUpdated":"2026-09-08T08:42:23.155Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-39827","references":[{"url":"https://git.kernel.org/stable/c/4cce478c3e82a5fc788d72adb2f4c4e983997639"},{"url":"https://git.kernel.org/stable/c/9c547c8eee9d1cf6e744611d688b9f725cf9a115"},{"url":"https://git.kernel.org/stable/c/d7563b456ed44151e1a82091d96f60166daea89b"},{"url":"https://git.kernel.org/stable/c/384210cceb1873a4c8218b27ba0745444436b728"},{"url":"https://git.kernel.org/stable/c/da9c9c877597170b929a6121a68dcd3dd9a80f45"}],"tags":["cve.org"],"epss":0.00211,"epssPercentile":0.10076,"ingestedAt":"2026-09-08T15:33:26.996Z","slug":"CVE-2025-39827","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 4cce478c3e82a5fc788d72adb2f4c4e983997639`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9c547c8eee9d1cf6e744611d688b9f725cf9a115`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d7563b456ed44151e1a82091d96f60166daea89b`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 384210cceb1873a4c8218b27ba0745444436b728`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < da9c9c877597170b929a6121a68dcd3dd9a80f45`\n- `Linux 2.6.12`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}