{"id":"CVE-2026-68459","summary":"f2fs: fix potential deadlock in gc_merge path of f2fs_balance_fs()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix potential deadlock in gc_merge path of f2fs_balance_fs()\n\nWhen we mount device w/ gc_merge mount option, we may suffer below\npotential deadlock:\n\nKworker\t\t\t\t\tGC trehad\t\t\tTruncator\n- f2fs_write_cache_pages\n - f2fs_write_single_data_page\n  - f2fs_do_write_data_page\n   - folio_start_writeback  --- set writeback flag on folio\n   - f2fs_outplace_write_data\n   : cached folio in internal bio cache\n  - f2fs_balance_fs\n   - wake_up(gc_thread)\n   : wake up gc thread to run foreground GC\n   - finish_wait(fggc_wq)\n   : wait on the waitqueue --- wait on GC thread to finish the work\n\t\t\t\t\t\t\t\t\t- truncate_inode_pages_range\n\t\t\t\t\t\t\t\t\t - __filemap_get_folio(, FGP_LOCK)  --- lock folio\n\t\t\t\t\t\t\t\t\t - truncate_inode_partial_folio\n\t\t\t\t\t\t\t\t\t  - folio_wait_writeback            --- wait on writeback being cleared\n\t\t\t\t\t- do_garbage_collect\n\t\t\t\t\t - move_data_page\n\t\t\t\t\t  - f2fs_get_lock_data_folio\n\t\t\t\t\t   - lock on folio  --- blocked on folio's lock\n\nIn order to avoid such deadlock, let's call below functions to commit\ncached bios in GC_MERGE path of f2fs_balance_fs() as the same as we did\nin NOGC_MERGE path.\n- f2fs_submit_merged_write(sbi, DATA);\n- f2fs_submit_all_merged_ipu_writes(sbi);","modified":"2026-08-16T03:48:26.261793155Z","published":"2026-08-15T05:51:19.713Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68459.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1436031b33fa23ab1ce7df5bc5500093413e8acf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8071500a8124e5a6d47d901a8d5ffd91743107a1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/89479a27fa4e1e11f378b3724944eabceb84f114"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8b4468ec023d0d1b4669dfb867588997cc03a06b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/aa807064473abd6f2cafe419fb77ea402d3e3104"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b885c7783c19c36c7bf899492a0bffcd68afa8c7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eb02f218aacb36365e0ca2339cbae81fb05d31a5"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68459.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68459"},{"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":"351df4b201157351c7d26bf12c3eeb9dbce98854"},{"fixed":"8071500a8124e5a6d47d901a8d5ffd91743107a1"},{"fixed":"eb02f218aacb36365e0ca2339cbae81fb05d31a5"},{"fixed":"1436031b33fa23ab1ce7df5bc5500093413e8acf"},{"fixed":"b885c7783c19c36c7bf899492a0bffcd68afa8c7"},{"fixed":"89479a27fa4e1e11f378b3724944eabceb84f114"},{"fixed":"aa807064473abd6f2cafe419fb77ea402d3e3104"},{"fixed":"8b4468ec023d0d1b4669dfb867588997cc03a06b"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68459.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.8.0"},{"fixed":"5.15.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.96"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.39"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68459.json"}}],"schema_version":"1.9.0"}