Data Fork Mapping Issue in Linux Kernel by Linux Foundation

CVE-2026-64600

What is CVE-2026-64600?

CVE-2026-64600 is a vulnerability found in the Linux kernel, specifically linked to the XFS file system. This issue arises from a data fork mapping problem which occurs during the management of inode operations. The vulnerability manifests when two helper functions, tasked with managing data and copy-on-write (cow) mappings, cycle the inode lock (ILOCK) without refreshing the data fork mapping. As a consequence, the mappings utilized during operations may become outdated, leading to incorrect functionality when direct I/O write operations proceed with stale data fork mappings. This vulnerability can negatively impact organizations by potentially resulting in data integrity issues and unintentional data corruption during file system operations, especially in environments that rely heavily on the integrity of file data.

Potential impact of CVE-2026-64600

1. Data Corruption: The primary risk associated with this vulnerability is the potential for data corruption due to stale data fork mappings. This could lead to critical data being written incorrectly, jeopardizing the accuracy and reliability of stored information.

2. File System Reliability: Organizations may experience issues with the reliability of the XFS file system. Operations that depend on accurate data mappings could fail or produce incorrect results, complicating data management and retrieval tasks.

3. Operational Downtime: The vulnerability could lead to an increased risk of operational downtime as systems may need to be taken offline for integrity checks and repairs, impacting overall productivity and potentially leading to financial losses.

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