CVE-2026-43127

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ntfs3: fix circular locking dependency in run_unpack_ex<br /> <br /> Syzbot reported a circular locking dependency between wnd-&gt;rw_lock<br /> (sbi-&gt;used.bitmap) and ni-&gt;file.run_lock.<br /> <br /> The deadlock scenario:<br /> 1. ntfs_extend_mft() takes ni-&gt;file.run_lock then wnd-&gt;rw_lock.<br /> 2. run_unpack_ex() takes wnd-&gt;rw_lock then tries to acquire<br /> ni-&gt;file.run_lock inside ntfs_refresh_zone().<br /> <br /> This creates an AB-BA deadlock.<br /> <br /> Fix this by using down_read_trylock() instead of down_read() when<br /> acquiring run_lock in run_unpack_ex(). If the lock is contended,<br /> skip ntfs_refresh_zone() - the MFT zone will be refreshed on the<br /> next MFT operation. This breaks the circular dependency since we<br /> never block waiting for run_lock while holding wnd-&gt;rw_lock.