{"id":"CVE-2025-71309","summary":"fs/ntfs3: fix deadlock in ni_read_folio_cmpr","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: fix deadlock in ni_read_folio_cmpr\n\nSyzbot reported a task hung in ni_readpage_cmpr (now ni_read_folio_cmpr).\nThis is caused by a lock inversion deadlock involving the inode mutex\n(ni_lock) and page locks.\n\nScenario:\n1. Task A enters ntfs_read_folio() for page X. It acquires ni_lock.\n2. Task A calls ni_read_folio_cmpr(), which attempts to lock all pages in\n   the compressed frame (including page Y).\n3. Concurrently, Task B (e.g., via readahead) has locked page Y and\n   calls ntfs_read_folio().\n4. Task B waits for ni_lock (held by A).\n5. Task A waits for page Y lock (held by B).\n   -\u003e DEADLOCK.\n\nThe fix is to restructure locking: do not take ni_lock in ntfs_read_folio().\nInstead, acquire ni_lock inside ni_read_folio_cmpr() ONLY AFTER all required\npage locks for the frame have been successfully acquired. This restores the\ncorrect lock ordering (Page Lock -\u003e ni_lock) consistent with VFS.\n\n[almaz.alexandrovich@paragon-software.com: ni_readpage_cmpr was renamed to ni_read_folio_cmpr]","modified":"2026-07-08T07:32:21.451822378Z","published":"2026-05-27T12:15:03.360Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/71xxx/CVE-2025-71309.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/cfe246b318106e1691bd6c9466c739e8559d25c2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e37a75bb866c29da954b51d0dd7670406246d9ee"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/71xxx/CVE-2025-71309.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-71309"},{"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":"f35590ee26f5722bfe12cdff14396c4c057a8f74"},{"fixed":"cfe246b318106e1691bd6c9466c739e8559d25c2"},{"fixed":"e37a75bb866c29da954b51d0dd7670406246d9ee"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-71309.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-71309.json"}}],"schema_version":"1.7.5"}