{"id":"DEBIAN-CVE-2021-47007","details":"In the Linux kernel, the following vulnerability has been resolved:  f2fs: fix panic during f2fs_resize_fs()  f2fs_resize_fs() hangs in below callstack with testcase: - mkfs 16GB image & mount image - dd 8GB fileA - dd 8GB fileB - sync - rm fileA - sync - resize filesystem to 8GB  kernel BUG at segment.c:2484! Call Trace:  allocate_segment_by_default+0x92/0xf0 [f2fs]  f2fs_allocate_data_block+0x44b/0x7e0 [f2fs]  do_write_page+0x5a/0x110 [f2fs]  f2fs_outplace_write_data+0x55/0x100 [f2fs]  f2fs_do_write_data_page+0x392/0x850 [f2fs]  move_data_page+0x233/0x320 [f2fs]  do_garbage_collect+0x14d9/0x1660 [f2fs]  free_segment_range+0x1f7/0x310 [f2fs]  f2fs_resize_fs+0x118/0x330 [f2fs]  __f2fs_ioctl+0x487/0x3680 [f2fs]  __x64_sys_ioctl+0x8e/0xd0  do_syscall_64+0x33/0x80  entry_SYSCALL_64_after_hwframe+0x44/0xa9  The root cause is we forgot to check that whether we have enough space in resized filesystem to store all valid blocks in before-resizing filesystem, then allocator will run out-of-space during block migration in free_segment_range().","modified":"2026-09-01T20:04:36.150901876Z","published":"2024-02-28T09:15:38.507Z","upstream":["CVE-2021-47007"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2021-47007"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.38-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47007.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.38-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47007.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.38-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47007.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}