# CVE-2022-49170: linux: In the Linux kernel, the following vulnerability has been resolved:  f2fs: fix to do sanity check on curseg->alloc_ty...

CVE-2022-49170 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49170, released February 26, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-49170
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0028
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 26, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  f2fs: fix to do sanity check on curseg->alloc_type  As Wenqing Liu reported in bugzilla:  https://bugzilla.kernel.org/show_bug.cgi?id=215657  - Overview UBSAN: array-index-out-of-bounds in fs/f2fs/segment.c:3460:2 when mount and operate a corrupted image  - Reproduce tested on kernel 5.17-rc4, 5.17-rc6  1. mkdir test_crash 2. cd test_crash 3. unzip tmp2.zip 4. mkdir mnt 5. ./single_test.sh f2fs 2  - Kernel dump [   46.434454] loop0: detected capacity change from 0 to 131072 [   46.529839] F2FS-fs (loop0): Mounted with checkpoint version = 7548c2d9 [   46.738319] ================================================================================ [   46.738412] UBSAN: array-index-out-of-bounds in fs/f2fs/segment.c:3460:2 [   46.738475] index 231 is out of range for type 'unsigned int [2]' [   46.738539] CPU: 2 PID: 939 Comm: umount Not tainted 5.17.0-rc6 #1 [   46.738547] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1.1 04/01/2014 [   46.738551] Call Trace: [   46.738556]  <TASK> [   46.738563]  dump_stack_lvl+0x47/0x5c [   46.738581]  ubsan_epilogue+0x5/0x50 [   46.738592]  __ubsan_handle_out_of_bounds+0x68/0x80 [   46.738604]  f2fs_allocate_data_block+0xdff/0xe60 [f2fs] [   46.738819]  do_write_page+0xef/0x210 [f2fs] [   46.738934]  f2fs_do_write_node_page+0x3f/0x80 [f2fs] [   46.739038]  __write_node_page+0x2b7/0x920 [f2fs] [   46.739162]  f2fs_sync_node_pages+0x943/0xb00 [f2fs] [   46.739293]  f2fs_write_checkpoint+0x7bb/0x1030 [f2fs] [   46.739405]  kill_f2fs_super+0x125/0x150 [f2fs] [   46.739507]  deactivate_locked_super+0x60/0xc0 [   46.739517]  deactivate_super+0x70/0xb0 [   46.739524]  cleanup_mnt+0x11a/0x200 [   46.739532]  __cleanup_mnt+0x16/0x20 [   46.739538]  task_work_run+0x67/0xa0 [   46.739547]  exit_to_user_mode_prepare+0x18c/0x1a0 [   46.739559]  syscall_exit_to_user_mode+0x26/0x40 [   46.739568]  do_syscall_64+0x46/0xb0 [   46.739584]  entry_SYSCALL_64_after_hwframe+0x44/0xae  The root cause is we missed to do sanity check on curseg->alloc_type, result in out-of-bound accessing on sbi->block_count[] array, fix it.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.17.3-1 | [DEBIAN-CVE-2022-49170](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49170.md) | Feb 26, 2025 |
| Linux | linux Debian 13.5 (trixie) | 5.17.3-1 | [DEBIAN-CVE-2022-49170](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49170.md) | Feb 26, 2025 |
| Linux | linux Debian 14 | 5.17.3-1 | [DEBIAN-CVE-2022-49170](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49170.md) | Feb 26, 2025 |

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