{"id":"CVE-2025-21781","summary":"batman-adv: fix panic during interface removal","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: fix panic during interface removal\n\nReference counting is used to ensure that\nbatadv_hardif_neigh_node and batadv_hard_iface\nare not freed before/during\nbatadv_v_elp_throughput_metric_update work is\nfinished.\n\nBut there isn't a guarantee that the hard if will\nremain associated with a soft interface up until\nthe work is finished.\n\nThis fixes a crash triggered by reboot that looks\nlike this:\n\nCall trace:\n batadv_v_mesh_free+0xd0/0x4dc [batman_adv]\n batadv_v_elp_throughput_metric_update+0x1c/0xa4\n process_one_work+0x178/0x398\n worker_thread+0x2e8/0x4d0\n kthread+0xd8/0xdc\n ret_from_fork+0x10/0x20\n\n(the batadv_v_mesh_free call is misleading,\nand does not actually happen)\n\nI was able to make the issue happen more reliably\nby changing hardif_neigh-\u003ebat_v.metric_work work\nto be delayed work. This allowed me to track down\nand confirm the fix.\n\n[sven@narfation.org: prevent entering batadv_v_elp_get_throughput without\n soft_iface]","modified":"2026-04-02T12:45:13.035224Z","published":"2025-02-27T02:18:24.013Z","related":["SUSE-SU-2025:01919-1","SUSE-SU-2025:1177-1","SUSE-SU-2025:1178-1","SUSE-SU-2025:1180-1","SUSE-SU-2025:20190-1","SUSE-SU-2025:20192-1","SUSE-SU-2025:20260-1","SUSE-SU-2025:20270-1","USN-7521-2"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21781.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/072b2787321903287a126c148e8db87dd7ef96fe"},{"type":"WEB","url":"https://git.kernel.org/stable/c/167422a07096a6006599067c8b55884064fa0b72"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2c3fb7df4cc6d043f70d4a8a10f8b915bbfb75e7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/522b1596ea19e327853804da2de60aeb9c5d6f42"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7eb5dd201695645af071592a50026eb780081a72"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ccb7276a6d26d6f8416e315b43b45e15ee7f29e2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ce3f1545bf8fa28bd05ec113679e8e6cd23af577"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f0a16c6c79768180333f3e41ce63f32730e3c3af"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21781.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21781"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"c833484e5f3872a38fe232c663586069d5ad9645"},{"fixed":"167422a07096a6006599067c8b55884064fa0b72"},{"fixed":"ce3f1545bf8fa28bd05ec113679e8e6cd23af577"},{"fixed":"f0a16c6c79768180333f3e41ce63f32730e3c3af"},{"fixed":"7eb5dd201695645af071592a50026eb780081a72"},{"fixed":"072b2787321903287a126c148e8db87dd7ef96fe"},{"fixed":"2c3fb7df4cc6d043f70d4a8a10f8b915bbfb75e7"},{"fixed":"522b1596ea19e327853804da2de60aeb9c5d6f42"},{"fixed":"ccb7276a6d26d6f8416e315b43b45e15ee7f29e2"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21781.json"}}],"schema_version":"1.7.5"}