# CVE-2021-47007: linux: In the Linux kernel, the following vulnerability has been resolved:  f2fs: fix panic during f2fs_resize_fs()  f2fs_re...

CVE-2021-47007 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47007, released February 28, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47007
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 28, 2024

## Description

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().

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.10.38-1 | [DEBIAN-CVE-2021-47007](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47007.md) | Feb 28, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.10.38-1 | [DEBIAN-CVE-2021-47007](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47007.md) | Feb 28, 2024 |
| Linux | linux Debian 14 | 5.10.38-1 | [DEBIAN-CVE-2021-47007](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47007.md) | Feb 28, 2024 |

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