{"schema_version":"1.9.0","id":"CVE-2025-40150","published":"2025-11-12T10:23:27.399Z","modified":"2026-08-12T03:51:11.310322253Z","summary":"f2fs: fix to avoid migrating empty section","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid migrating empty section\n\nIt reports a bug from device w/ zufs:\n\nF2FS-fs (dm-64): Inconsistent segment (173822) type [1, 0] in SSA and SIT\nF2FS-fs (dm-64): Stopped filesystem due to reason: 4\n\nThread A\t\t\t\tThread B\n- f2fs_expand_inode_data\n - f2fs_allocate_pinning_section\n  - f2fs_gc_range\n   - do_garbage_collect w/ segno #x\n\t\t\t\t\t- writepage\n\t\t\t\t\t - f2fs_allocate_data_block\n\t\t\t\t\t  - new_curseg\n\t\t\t\t\t   - allocate segno #x\n\nThe root cause is: fallocate on pinning file may race w/ block allocation\nas above, result in do_garbage_collect() from fallocate() may migrate\nsegment which is just allocated by a log, the log will update segment type\nin its in-memory structure, however GC will get segment type from on-disk\nSSA block, once segment type changes by log, we can detect such\ninconsistency, then shutdown filesystem.\n\nIn this case, on-disk SSA shows type of segno #173822 is 1 (SUM_TYPE_NODE),\nhowever segno #173822 was just allocated as data type segment, so in-memory\nSIT shows type of segno #173822 is 0 (SUM_TYPE_DATA).\n\nChange as below to fix this issue:\n- check whether current section is empty before gc\n- add sanity checks on do_garbage_collect() to avoid any race case, result\nin migrating segment used by log.\n- btw, it fixes misc issue in printed logs: \"SSA and SIT\" -> \"SIT and SSA\".","affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"40d76c393cca83938b11eb7ca8983aa3cd0ed69b"},{"fixed":"db489778e6f2a4034c2cd26fadda2796eba24dcd"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"9703d69d9d153bb230711d0d577454552aeb13d4"},{"fixed":"25d2dc669f2a7e48b335d1cb07139f2ffc9fe5df"},{"fixed":"eec1589be36fcf7440755703e4faeee2c01e360b"},{"fixed":"d625a2b08c089397d3a03bff13fa8645e4ec7a01"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.6.33"},{"fixed":"6.6.130"}]}],"versions":["v6.6.129","v6.6.128","v6.6.127","v6.6.126","v6.6.125","v6.6.124","v6.6.123","v6.6.122","v6.6.121","v6.6.120","v6.6.119","v6.6.118","v6.6.117","v6.6.116","v6.6.115","v6.6.114","v6.6.113","v6.6.112","v6.6.111","v6.6.110","v6.6.109","v6.6.108","v6.6.107","v6.6.106","v6.6.105","v6.6.104","v6.6.103","v6.6.102","v6.6.101","v6.6.100","v6.6.99","v6.6.98","v6.6.97","v6.6.96","v6.6.95","v6.6.94","v6.6.93","v6.6.92","v6.6.91","v6.6.90","v6.6.89","v6.6.88","v6.6.87","v6.6.86","v6.6.85","v6.6.84","v6.6.83","v6.6.82","v6.6.81","v6.6.80","v6.6.79","v6.6.78","v6.6.77","v6.6.76","v6.6.75","v6.6.74","v6.6.73","v6.6.72","v6.6.71","v6.6.70","v6.6.69","v6.6.68","v6.6.67","v6.6.66","v6.6.65","v6.6.64","v6.6.63","v6.6.62","v6.6.61","v6.6.60","v6.6.59","v6.6.58","v6.6.57","v6.6.56","v6.6.55","v6.6.54","v6.6.53","v6.6.52","v6.6.51","v6.6.50","v6.6.49","v6.6.48","v6.6.47","v6.6.46","v6.6.45","v6.6.44","v6.6.43","v6.6.42","v6.6.41","v6.6.40","v6.6.39","v6.6.38","v6.6.37","v6.6.36","v6.6.35","v6.6.34","v6.6.33"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40150.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.6.130"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.78"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.9.0"},{"fixed":"6.17.3"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40150.json"}}],"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/25d2dc669f2a7e48b335d1cb07139f2ffc9fe5df"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d625a2b08c089397d3a03bff13fa8645e4ec7a01"},{"type":"WEB","url":"https://git.kernel.org/stable/c/db489778e6f2a4034c2cd26fadda2796eba24dcd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eec1589be36fcf7440755703e4faeee2c01e360b"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40150.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-40150"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40150.json"}}