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Date: Fri, 16 Oct 2026 14:25:02 +0200
From: Nicolai Buchwitz <nb@tipi-net.de>
To: stable@vger.kernel.org
Cc: sashal@kernel.org, technoboy85@gmail.com, hirofumi@mail.parknet.co.jp,
 brauner@kernel.org
Subject: Please backport FAT end-of-directory fix to 6.18 and 6.12
Message-ID: <96dbd7d103fa6df33b0bbd492e309bd7@tipi-net.de>
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Hi,

Please consider backporting upstream commit

6a2875517c778ac1111b6920e94cbab91cda8724
fat: stop reading directory entries past the end-of-directory marker

to 6.18.y and 6.12.y, and any other affected supported stable branches.

The fix prevents directory traversal from interpreting residual data
after the FAT end-of-directory marker as real directory entries,
resulting in bogus filenames and I/O errors.

This affects FAT16 CompactFlash media written by devices such as the
Psion Series 7/netBook running EPOC32.

Thanks,
Nicolai