{"id":"CVE-2025-39827","title":"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…","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","vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 2.6.12.1, < 6.1.150","linux_kernel >= 6.2, < 6.6.104","linux_kernel >= 6.7, < 6.12.45","linux_kernel >= 6.13, < 6.16.5","linux_kernel = 2.6.12","linux_kernel = 6.17","debian_linux = 11.0"],"patched":["linux_kernel 6.16.5"],"published":"2025-09-16","updated":"2026-10-15","sourceUpdated":"2026-10-15T02:18:01.717","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-39827","references":[{"url":"https://git.kernel.org/stable/c/384210cceb1873a4c8218b27ba0745444436b728","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4cce478c3e82a5fc788d72adb2f4c4e983997639","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9c547c8eee9d1cf6e744611d688b9f725cf9a115","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d7563b456ed44151e1a82091d96f60166daea89b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/da9c9c877597170b929a6121a68dcd3dd9a80f45","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-032379.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"epss":0.00225,"epssPercentile":0.13139,"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_kernel >= 2.6.12.1, < 6.1.150`\n- `linux_kernel >= 6.2, < 6.6.104`\n- `linux_kernel >= 6.7, < 6.12.45`\n- `linux_kernel >= 6.13, < 6.16.5`\n- `linux_kernel = 2.6.12`\n- `linux_kernel = 6.17`\n- `debian_linux = 11.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.16.5`","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}