{"id":"CVE-2025-40106","summary":"comedi: fix divide-by-zero in comedi_buf_munge()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: fix divide-by-zero in comedi_buf_munge()\n\nThe comedi_buf_munge() function performs a modulo operation\n`async-\u003emunge_chan %= async-\u003ecmd.chanlist_len` without first\nchecking if chanlist_len is zero. If a user program submits a command with\nchanlist_len set to zero, this causes a divide-by-zero error when the device\nprocesses data in the interrupt handler path.\n\nAdd a check for zero chanlist_len at the beginning of the\nfunction, similar to the existing checks for !map and\nCMDF_RAWDATA flag. When chanlist_len is zero, update\nmunge_count and return early, indicating the data was\nhandled without munging.\n\nThis prevents potential kernel panics from malformed user commands.","modified":"2026-04-16T00:02:43.810883163Z","published":"2025-10-31T09:41:46.740Z","related":["SUSE-SU-2026:0447-1","SUSE-SU-2026:0472-1","SUSE-SU-2026:0587-1","SUSE-SU-2026:20477-1","SUSE-SU-2026:20498-1","SUSE-SU-2026:20555-1","SUSE-SU-2026:20599-1","SUSE-SU-2026:20615-1","SUSE-SU-2026:20845-1","SUSE-SU-2026:20876-1","openSUSE-SU-2025:15702-1","openSUSE-SU-2026:10301-1","openSUSE-SU-2026:20287-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40106.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2670932f2465793fea1ef073e40883e8390fa4d9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4ffea48c69cb2b96a281cb7e5e42d706996631db"},{"type":"WEB","url":"https://git.kernel.org/stable/c/55520f65fd447e04099a2c44185453c18ea73b7e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6db19822512396be1a3e1e20c16c97270285ba1a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/87b318ba81dda2ee7b603f4f6c55e78ec3e95974"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a4bb5d1bc2f238461bcbe5303eb500466690bb2c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d4854eff25efb06d0d84c13e7129bbdba4125f8c"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40106.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-40106"},{"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":"ed9eccbe8970f6eedc1b978c157caf1251a896d4"},{"fixed":"4ffea48c69cb2b96a281cb7e5e42d706996631db"},{"fixed":"8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c"},{"fixed":"2670932f2465793fea1ef073e40883e8390fa4d9"},{"fixed":"6db19822512396be1a3e1e20c16c97270285ba1a"},{"fixed":"d4854eff25efb06d0d84c13e7129bbdba4125f8c"},{"fixed":"a4bb5d1bc2f238461bcbe5303eb500466690bb2c"},{"fixed":"55520f65fd447e04099a2c44185453c18ea73b7e"},{"fixed":"87b318ba81dda2ee7b603f4f6c55e78ec3e95974"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-40106.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.29"},{"fixed":"5.4.301"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.246"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.196"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.158"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.115"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.56"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.17.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-40106.json"}}],"schema_version":"1.7.5"}