{"id":"CVE-2021-47007","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix panic during f2fs_resize_fs()\n\nf2fs_resize_fs() hangs in below callstack with testcase:\n- mkfs 16GB image & mount image\n- dd 8GB fileA\n- dd 8GB fileB\n- sync\n- rm fileA\n- sync\n- resize filesystem to 8GB\n\nkernel BUG at segment.c:2484!\nCall Trace:\n allocate_segment_by_default+0x92/0xf0 [f2fs]\n f2fs_allocate_data_block+0x44b/0x7e0 [f2fs]\n do_write_page+0x5a/0x110 [f2fs]\n f2fs_outplace_write_data+0x55/0x100 [f2fs]\n f2fs_do_write_data_page+0x392/0x850 [f2fs]\n move_data_page+0x233/0x320 [f2fs]\n do_garbage_collect+0x14d9/0x1660 [f2fs]\n free_segment_range+0x1f7/0x310 [f2fs]\n f2fs_resize_fs+0x118/0x330 [f2fs]\n __f2fs_ioctl+0x487/0x3680 [f2fs]\n __x64_sys_ioctl+0x8e/0xd0\n do_syscall_64+0x33/0x80\n entry_SYSCALL_64_after_hwframe+0x44/0xa9\n\nThe root cause is we forgot to check that whether we have enough space\nin resized filesystem to store all valid blocks in before-resizing\nfilesystem, then allocator will run out-of-space during block migration\nin free_segment_range().","modified":"2026-03-15T14:45:39.261347Z","published":"2024-02-28T09:15:38.507Z","references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/1c20a4896409f5ca1c770e1880c33d0a28a8b10f"},{"type":"FIX","url":"https://git.kernel.org/stable/c/3ab0598e6d860ef49d029943ba80f627c15c15d6"},{"type":"FIX","url":"https://git.kernel.org/stable/c/822054e5026c43b1dd60cf387dd999e95ee2ecc2"},{"type":"FIX","url":"https://git.kernel.org/stable/c/860afd680d9cc1dabd61cda3cd246f60aa1eb705"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47007.json","unresolved_ranges":[{"events":[{"introduced":"5.8"},{"fixed":"5.10.38"}]},{"events":[{"introduced":"5.11"},{"fixed":"5.11.22"}]},{"events":[{"introduced":"5.12"},{"fixed":"5.12.5"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}