# CVE-2024-33847: linux: In the Linux kernel, the following vulnerability has been resolved:  f2fs: compress: don't allow unaligned truncation...

CVE-2024-33847 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-33847, released June 24, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-33847
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 24, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  f2fs: compress: don't allow unaligned truncation on released compress inode  f2fs image may be corrupted after below testcase: - mkfs.f2fs -O extra_attr,compression -f /dev/vdb - mount /dev/vdb /mnt/f2fs - touch /mnt/f2fs/file - f2fs_io setflags compression /mnt/f2fs/file - dd if=/dev/zero of=/mnt/f2fs/file bs=4k count=4 - f2fs_io release_cblocks /mnt/f2fs/file - truncate -s 8192 /mnt/f2fs/file - umount /mnt/f2fs - fsck.f2fs /dev/vdb  [ASSERT] (fsck_chk_inode_blk:1256)  --> ino: 0x5 has i_blocks: 0x00000002, but has 0x3 blocks [FSCK] valid_block_count matching with CP             [Fail] [0x4, 0x5] [FSCK] other corrupted bugs                           [Fail]  The reason is: partial truncation assume compressed inode has reserved blocks, after partial truncation, valid block count may change w/o .i_blocks and .total_valid_block_count update, result in corruption.  This patch only allow cluster size aligned truncation on released compress inode for fixing.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.94-1 | [DEBIAN-CVE-2024-33847](https://patchblox.com/security/data/fix/linux/debian-cve-2024-33847.md) | Jun 24, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.9.7-1 | [DEBIAN-CVE-2024-33847](https://patchblox.com/security/data/fix/linux/debian-cve-2024-33847.md) | Jun 24, 2024 |
| Linux | linux Debian 14 | 6.9.7-1 | [DEBIAN-CVE-2024-33847](https://patchblox.com/security/data/fix/linux/debian-cve-2024-33847.md) | Jun 24, 2024 |

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