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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2021-47114 Detail

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/[email protected]/T/


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/0a31dd6fd2f4e7db538fb6eb1f06973d81f8dd3b CVE, kernel.org Patch 
https://git.kernel.org/stable/c/33e03adafb29eedae1bae9cdb50c1385279fcf65 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/624fa7baa3788dc9e57840ba5b94bc22b03cda57 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/6bba4471f0cc1296fe3c2089b9e52442d3074b2e CVE, kernel.org Patch 
https://git.kernel.org/stable/c/a1700479524bb9cb5e8ae720236a6fabd003acae CVE, kernel.org Patch 
https://git.kernel.org/stable/c/c8d5faee46242c3f33b8a71a4d7d52214785bfcc CVE, kernel.org Patch 
https://git.kernel.org/stable/c/cc2edb99ea606a45182b5ea38cc8f4e583aa0774 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/cec4e857ffaa8c447f51cd8ab4e72350077b6770 CVE, kernel.org Patch 

Weakness Enumeration

CWE-ID CWE Name Source
NVD-CWE-noinfo Insufficient Information cwe source acceptance level NIST  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

6 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-47114
NVD Published Date:
03/15/2024
NVD Last Modified:
04/04/2025
Source:
kernel.org