{"id":"CVE-2026-31750","summary":"comedi: runflags cannot determine whether to reclaim chanlist","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: runflags cannot determine whether to reclaim chanlist\n\nsyzbot reported a memory leak [1], because commit 4e1da516debb (\"comedi:\nAdd reference counting for Comedi command handling\") did not consider\nthe exceptional exit case in do_cmd_ioctl() where runflags is not set.\nThis caused chanlist not to be properly freed by do_become_nonbusy(),\nas it only frees chanlist when runflags is correctly set.\n\nAdded a check in do_become_nonbusy() for the case where runflags is not\nset, to properly free the chanlist memory.\n\n[1]\nBUG: memory leak\n  backtrace (crc 844a0efa):\n    __comedi_get_user_chanlist drivers/comedi/comedi_fops.c:1815 [inline]\n    do_cmd_ioctl.part.0+0x112/0x350 drivers/comedi/comedi_fops.c:1890\n    do_cmd_ioctl drivers/comedi/comedi_fops.c:1858 [inline]","modified":"2026-08-12T03:51:36.654102520Z","published":"2026-05-01T14:14:42.887Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31750.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/29f644f14b89e6c4965e3c89251929e451190a66"},{"type":"WEB","url":"https://git.kernel.org/stable/c/830c848aba9f047eb6b34288975ebeb8e8621451"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31750.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31750"},{"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":"4e1da516debbe6a573ffa0392e2809d180d0575c"},{"fixed":"830c848aba9f047eb6b34288975ebeb8e8621451"},{"fixed":"29f644f14b89e6c4965e3c89251929e451190a66"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31750.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.12"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31750.json"}}],"schema_version":"1.9.0"}