# CVE-2024-43859: linux: In the Linux kernel, the following vulnerability has been resolved:  f2fs: fix to truncate preallocated blocks in f2f...

CVE-2024-43859 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-43859, released August 17, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-43859
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 17, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  f2fs: fix to truncate preallocated blocks in f2fs_file_open()  chenyuwen reports a f2fs bug as below:  Unable to handle kernel NULL pointer dereference at virtual address 0000000000000011  fscrypt_set_bio_crypt_ctx+0x78/0x1e8  f2fs_grab_read_bio+0x78/0x208  f2fs_submit_page_read+0x44/0x154  f2fs_get_read_data_page+0x288/0x5f4  f2fs_get_lock_data_page+0x60/0x190  truncate_partial_data_page+0x108/0x4fc  f2fs_do_truncate_blocks+0x344/0x5f0  f2fs_truncate_blocks+0x6c/0x134  f2fs_truncate+0xd8/0x200  f2fs_iget+0x20c/0x5ac  do_garbage_collect+0x5d0/0xf6c  f2fs_gc+0x22c/0x6a4  f2fs_disable_checkpoint+0xc8/0x310  f2fs_fill_super+0x14bc/0x1764  mount_bdev+0x1b4/0x21c  f2fs_mount+0x20/0x30  legacy_get_tree+0x50/0xbc  vfs_get_tree+0x5c/0x1b0  do_new_mount+0x298/0x4cc  path_mount+0x33c/0x5fc  __arm64_sys_mount+0xcc/0x15c  invoke_syscall+0x60/0x150  el0_svc_common+0xb8/0xf8  do_el0_svc+0x28/0xa0  el0_svc+0x24/0x84  el0t_64_sync_handler+0x88/0xec  It is because inode.i_crypt_info is not initialized during below path: - mount  - f2fs_fill_super   - f2fs_disable_checkpoint    - f2fs_gc     - f2fs_iget      - f2fs_truncate  So, let's relocate truncation of preallocated blocks to f2fs_file_open(), after fscrypt_file_open().

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.112-1 | [DEBIAN-CVE-2024-43859](https://patchblox.com/security/data/fix/linux/debian-cve-2024-43859.md) | Aug 17, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.10.3-1 | [DEBIAN-CVE-2024-43859](https://patchblox.com/security/data/fix/linux/debian-cve-2024-43859.md) | Aug 17, 2024 |
| Linux | linux Debian 14 | 6.10.3-1 | [DEBIAN-CVE-2024-43859](https://patchblox.com/security/data/fix/linux/debian-cve-2024-43859.md) | Aug 17, 2024 |

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