CVE-2025-71309

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> fs/ntfs3: fix deadlock in ni_read_folio_cmpr<br /> <br /> Syzbot reported a task hung in ni_readpage_cmpr (now ni_read_folio_cmpr).<br /> This is caused by a lock inversion deadlock involving the inode mutex<br /> (ni_lock) and page locks.<br /> <br /> Scenario:<br /> 1. Task A enters ntfs_read_folio() for page X. It acquires ni_lock.<br /> 2. Task A calls ni_read_folio_cmpr(), which attempts to lock all pages in<br /> the compressed frame (including page Y).<br /> 3. Concurrently, Task B (e.g., via readahead) has locked page Y and<br /> calls ntfs_read_folio().<br /> 4. Task B waits for ni_lock (held by A).<br /> 5. Task A waits for page Y lock (held by B).<br /> -&gt; DEADLOCK.<br /> <br /> The fix is to restructure locking: do not take ni_lock in ntfs_read_folio().<br /> Instead, acquire ni_lock inside ni_read_folio_cmpr() ONLY AFTER all required<br /> page locks for the frame have been successfully acquired. This restores the<br /> correct lock ordering (Page Lock -&gt; ni_lock) consistent with VFS.<br /> <br /> [almaz.alexandrovich@paragon-software.com: ni_readpage_cmpr was renamed to ni_read_folio_cmpr]