{"id":"CVE-2026-99067","kind":"vulnerability","aliases":["CVE-2026-99067"],"related":[],"title":"Linux kernel btrfs scrub leaks a filesystem root reference on error","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: scrub: fix local_root reference leak in scrub_print_warning_inode()\n\nWhen paths_from_inode() fails, scrub_print_warning_inode() jumps to err\nwithout dropping the reference taken by btrfs_get_fs_root(), leaking a\nreference to the root every time path resolution fails while printing\nscrub warnings.  Every other error and success path of the function\ndrops the reference.\n\nDrop the reference on the paths_from_inode() failure path too.","summary":"When btrfs scrub fails to resolve a file path while printing a warning, the kernel does not release a reference it took to the filesystem root. Each such failure leaks one reference, which can slowly exhaust resources on a system that repeatedly hits this error.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["btrfs","kernel","linux","runtime"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-10-23T13:17:30+00:00","first_seen_at":"2026-10-23T21:57:34+00:00","triaged_at":"2026-10-25T04:53:48+00:00","updated_at":"2026-10-25T04:53:48+00:00","category":"runtime","confidence":0.4,"triage":{"at":"2026-10-25T04:53:48Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Linux kernel btrfs scrub leaks a filesystem root reference on error","impact":"low","summary":"When btrfs scrub fails to resolve a file path while printing a warning, the kernel does not release a reference it took to the filesystem root. Each such failure leaks one reference, which can slowly exhaust resources on a system that repeatedly hits this error.","category":"runtime","nicknames":[],"who_cares":["linux","btrfs","kernel"],"confidence":0.4,"needs_auth":"unknown","worst_case":"unknown; the sources describe a reference leak, not code execution","analyst_note":"Check the kernel.org stable commit for the affected and fixed kernel versions and whether the leak has any security consequence beyond resource exhaustion.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"low"},"cost_usd":0.000516,"input_tokens":3391,"output_tokens":354,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2026':13A,16A '-99067':14A,17A 'btrfs':3A,18B,23B,77C,107C 'cve':12A,15A 'drop':102C,135C,138C 'err':100C 'error':11A,66B,128C 'everi':117C,126C 'exhaust':57B 'fail':25B,93C,121C 'failur':50B,146C 'file':29B 'filesystem':7A,46B 'fix':79C 'follow':72C 'fs':109C 'function':134C 'get':108C 'hit':64B 'inod':88C,92C,97C,145C 'jump':98C 'kernel':2A,19B,36B,70C 'leak':5A,51B,83C,111C 'linux':1A,20B,69C 'local':80C 'one':52B 'path':30B,90C,119C,131C,143C,147C 'print':32B,86C,95C,123C 'refer':9A,41B,53B,82C,104C,113C,137C,140C 'releas':39B 'repeat':63B 'resolut':120C 'resolv':27B,76C 'resourc':58B 'root':8A,47B,81C,110C,116C 'runtim':21B 'scrub':4A,24B,78C,85C,94C,124C 'slowli':56B 'success':130C 'system':61B 'taken':105C 'time':118C 'took':43B 'vulner':73C 'warn':34B,87C,96C,125C 'without':101C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-23T13:17:30+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-99067","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99067","severity":null,"published_at":"2026-10-23T13:17:30+00:00","modified_at":"2026-10-23T13:17:30+00:00","first_seen_at":"2026-10-23T21:57:34+00:00","fetched_at":"2026-10-23T22:29:03+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}