# CVE-2021-47114: linux: In the Linux kernel, the following vulnerability has been resolved:  ocfs2: fix data corruption by fallocate  When fa...

CVE-2021-47114 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47114, released March 15, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47114
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 15, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  ocfs2: fix data corruption by fallocate  When fallocate punches holes out of inode size, if original isize is in the middle of last cluster, then the part from isize to the end of the cluster will be zeroed with buffer write, at that time isize is not yet updated to match the new size, if writeback is kicked in, it will invoke ocfs2_writepage()->block_write_full_page() where the pages out of inode size will be dropped.  That will cause file corruption.  Fix this by zero out eof blocks when extending the inode size.  Running the following command with qemu-image 4.2.1 can get a corrupted coverted image file easily.      qemu-img convert -p -t none -T none -f qcow2 $qcow_image \              -O qcow2 -o compat=1.1 $qcow_image.conv  The usage of fallocate in qemu is like this, it first punches holes out of inode size, then extend the inode size.      fallocate(11, FALLOC_FL_KEEP_SIZE|FALLOC_FL_PUNCH_HOLE, 2276196352, 65536) = 0     fallocate(11, 0, 2276196352, 65536) = 0  v1: https://www.spinics.net/lists/linux-fsdevel/msg193999.html v2: https://lore.kernel.org/linux-fsdevel/20210525093034.GB4112@quack2.suse.cz/T/

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.10.46-1 | [DEBIAN-CVE-2021-47114](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47114.md) | Mar 15, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.10.46-1 | [DEBIAN-CVE-2021-47114](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47114.md) | Mar 15, 2024 |
| Linux | linux Debian 14 | 5.10.46-1 | [DEBIAN-CVE-2021-47114](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47114.md) | Mar 15, 2024 |

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