{"id":"CVE-2025-39826","title":"net: rose: convert 'use' field to refcount_t","summary":"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 …","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 < fb07156cc0742ba4e93dfcc84280c011d05b301f","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f8c29fc437d03a98fb075c31c5be761cc8326284","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 0085b250fcc79f900c82a69980ec2f3e1871823b","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 203e4f42596ede31498744018716a3db6dbb7f51","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d860d1faa6b2ce3becfdb8b0c2b048ad31800061","Linux 2.6.12"],"published":"2025-09-16","updated":"2026-09-08","sourceUpdated":"2026-09-08T08:42:21.594Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-39826","references":[{"url":"https://git.kernel.org/stable/c/fb07156cc0742ba4e93dfcc84280c011d05b301f"},{"url":"https://git.kernel.org/stable/c/f8c29fc437d03a98fb075c31c5be761cc8326284"},{"url":"https://git.kernel.org/stable/c/0085b250fcc79f900c82a69980ec2f3e1871823b"},{"url":"https://git.kernel.org/stable/c/203e4f42596ede31498744018716a3db6dbb7f51"},{"url":"https://git.kernel.org/stable/c/d860d1faa6b2ce3becfdb8b0c2b048ad31800061"}],"tags":["cve.org"],"epss":0.00201,"epssPercentile":0.10303,"ingestedAt":"2026-09-08T15:33:26.997Z","slug":"CVE-2025-39826","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < fb07156cc0742ba4e93dfcc84280c011d05b301f`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f8c29fc437d03a98fb075c31c5be761cc8326284`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 0085b250fcc79f900c82a69980ec2f3e1871823b`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 203e4f42596ede31498744018716a3db6dbb7f51`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d860d1faa6b2ce3becfdb8b0c2b048ad31800061`\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":[]}