CVE-2022-50126: 
Linux Kernel vulnerability analysis and mitigation

A vulnerability in the Linux kernel's jbd2 (Journaling Block Device 2) subsystem was identified and tracked as CVE-2022-50126. The issue involves an assertion failure 'jh->b_frozen_data == NULL' in jbd2_journal_dirty_metadata() when the journal is aborted. This vulnerability was disclosed on June 18, 2025 (NVD, Wiz).

The vulnerability occurs during specific process sequences involving journal transactions and unlink operations. The issue manifests when jbd2_journal_dirty_metadata() is called after journal aborting, where __jbd2_journal_refile_buffer() is executed while holding @jh->b_state_lock. The technical flow involves a sequence of operations including jbd2_journal_commit_transaction, unlink operations, and transaction state changes that lead to the assertion failure (NVD).

When triggered, the vulnerability results in a kernel BUG assertion failure at fs/jbd2/transaction.c:1629, which can cause system instability. The issue affects the filesystem journaling mechanism, potentially impacting system reliability and data integrity (Wiz).

The fix involves moving the 'is_handle_aborted()' check into the area protected by @jh->b_state_lock to prevent the assertion failure. This modification ensures proper synchronization of the journal state checking (Wiz).