CVE-2026-72033: orangefs: keep the readdir entry size 64-bit in fill_from_part()

From: Greg Kroah-Hartman <[email protected]>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

orangefs: keep the readdir entry size 64-bit in fill_from_part()

fill_from_part() computes the size of a directory entry in size_t but
stores it in a __u32. An entry length near U32_MAX wraps it to a small
value, bypasses the bounds check, and is then used to index the entry,
reading far past the directory part -- an out-of-bounds read that oopses
the kernel.

Compute the size as a u64 so it cannot truncate; the bounds check then
rejects the entry. The trailer is supplied by the userspace client.

The Linux kernel CVE team has assigned CVE-2026-72033 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 4.12 with commit 480e3e532e31666a18520a7964bb4095d7a16b9a and fixed in 5.10.261 with commit 1679780f482feeb82acb5995587d4fb1d1fe82fd
	Issue introduced in 4.12 with commit 480e3e532e31666a18520a7964bb4095d7a16b9a and fixed in 5.15.212 with commit a72bbb43689591c9d36e3bb45c2d4e688cf92682
	Issue introduced in 4.12 with commit 480e3e532e31666a18520a7964bb4095d7a16b9a and fixed in 6.1.178 with commit 36723b28e3293047f087f4501f1ef4ead418dd84
	Issue introduced in 4.12 with commit 480e3e532e31666a18520a7964bb4095d7a16b9a and fixed in 6.6.145 with commit 07c05601a9a8e5d4481b2a4a16dc0e3c5bc63ad9
	Issue introduced in 4.12 with commit 480e3e532e31666a18520a7964bb4095d7a16b9a and fixed in 6.12.97 with commit fdf06a1b66ff39664b01c6bb6a2aa98d81e8ebe1
	Issue introduced in 4.12 with commit 480e3e532e31666a18520a7964bb4095d7a16b9a and fixed in 6.18.40 with commit 82fc886e244c76fadf05ef1958aaf8815478ccde
	Issue introduced in 4.12 with commit 480e3e532e31666a18520a7964bb4095d7a16b9a and fixed in 7.1.5 with commit e3d325c0bdb7bc5d1b4cc8d8441d79794cd03729
	Issue introduced in 4.12 with commit 480e3e532e31666a18520a7964bb4095d7a16b9a and fixed in 7.2-rc2 with commit 18227a6bc98bd0ba96ed3ce9d5b28776a5a28dfc

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-72033
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	fs/orangefs/dir.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/1679780f482feeb82acb5995587d4fb1d1fe82fd
	https://git.kernel.org/stable/c/a72bbb43689591c9d36e3bb45c2d4e688cf92682
	https://git.kernel.org/stable/c/36723b28e3293047f087f4501f1ef4ead418dd84
	https://git.kernel.org/stable/c/07c05601a9a8e5d4481b2a4a16dc0e3c5bc63ad9
	https://git.kernel.org/stable/c/fdf06a1b66ff39664b01c6bb6a2aa98d81e8ebe1
	https://git.kernel.org/stable/c/82fc886e244c76fadf05ef1958aaf8815478ccde
	https://git.kernel.org/stable/c/e3d325c0bdb7bc5d1b4cc8d8441d79794cd03729
	https://git.kernel.org/stable/c/18227a6bc98bd0ba96ed3ce9d5b28776a5a28dfc