cve-2026-45934

CVE-2026-45934 is a Linux kernel Btrfs flaw disclosed by kernel.org and published by NVD on May 27, 2026. The bug causes non-consecutive pending chunk allocations to make DUP chunk allocation overlap device extents, aborting a filesystem transaction with EEXIST. While not a remote-code-execution vulnerability, it leads to downtime, forced read-only behavior, or unplanned recovery windows. The fix addresses an allocation map correctness issue rather than a missing lock. This tag covers discussions about the vulnerability's impact on Btrfs filesystem stability, transaction aborts, and the kernel patch that resolves the overlap condition.