{"schema":"threatline.record/2","record":{"id":"CVE-2026-98682","aliases":[],"summary":"smb: client: drain and invalidate before server-side copy/clone","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: drain and invalidate before server-side copy/clone\n\ncifs_file_copychunk_range() and the clone (FICLONE) path of\ncifs_remap_file_range() do not serialise the destination page cache\nagainst the server-side copy the way the other server-side range\noperations (smb3_zero_range(), smb3_punch_hole(), smb3_collapse_range()\nand smb3_insert_range()) do.\n\ncifs_file_copychunk_range() invalidates the destination range with\nfilemap_invalidate_inode(), which takes and drops the mapping's\ninvalidate_lock internally, so the lock is no longer held when the\ncopychunk ioctl is issued.  It also never drains in-flight netfs I/O on\nthe target.  The clone path never takes the invalidate_lock at all (only\ni_rwsem), uses a bare truncate_inode_pages_range() and likewise does not\ndrain outstanding I/O.\n\nAs a result an asynchronous destination writeback can complete after the\nserver-side copy/clone has run and reinstate stale data over the region\njust written by the server, corrupting the file.  This is the same class\nof corruption as commit d7d2adcd022b (\"smb/client: flush dirty data\nbefore punching a hole\") and has been seen randomly in generic/363\nagainst Windows Server.\n\nFix both paths to follow the established ordering: hold the target\nmapping's invalidate_lock across the flush and invalidation of the\ndestination and the server ioctl, and call netfs_wait_for_outstanding_io()\non the target to drain in-flight writes before the ioctl is issued.  Only\nthe target inode's invalidate_lock is required, as the source is merely\nflushed and not invalidated; i_rwsem (already held via\nlock_two_nondirectories()) is acquired before the invalidate_lock,\nmatching the VFS lock ordering.  Since filemap_invalidate_inode() takes\nthat same lock internally, replace it with its own unmap/flush/invalidate\nsteps instead of calling it, and return early on a zero-length copy to\navoid a range underflow.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98682","source_modified_at":"2026-10-19T09:23:52.548Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"c54fc3a4f375663f2361a9cbb2955fb4ef912879","lessThan":"dc71660f11ef2fecc0695a41e49cd496a9d255ab","status":"affected","versionType":"git"},{"version":"c54fc3a4f375663f2361a9cbb2955fb4ef912879","lessThan":"c9b1194e8ec99d95db25db45edd2fbf690f043ab","status":"affected","versionType":"git"},{"version":"358bd5f436d820bb758833050aae065b35d6986c","status":"affected","versionType":"git"},{"version":"43801359c8971cc49b4a4db5015fba77fbd09c32","status":"affected","versionType":"git"},{"version":"6.1.68","lessThan":"6.2","status":"affected","versionType":"semver"},{"version":"6.6.7","lessThan":"6.7","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98682","source_modified_at":"2026-10-19T09:23:52.548Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.7","status":"affected"},{"version":"0","lessThan":"6.7","status":"unaffected","versionType":"semver"},{"version":"7.2.10","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98682","source_modified_at":"2026-10-19T09:23:52.548Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6.2","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98682","source_modified_at":"2026-10-19T09:23:52.548Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6.7","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00155,"percentile":0.04315,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:45:47.375Z","modified_at":"2026-10-19T09:23:52.548Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98682","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:23:52.548Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98682","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/dc71660f11ef2fecc0695a41e49cd496a9d255ab"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/c9b1194e8ec99d95db25db45edd2fbf690f043ab"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:23:52.548Z","content_hash":"8868aea95f8eaa8148903e9c45622edde273e543d374847da2eb7c554d3cf57c"}}