CVE-2026-97485: omfs: handle set_blocksize failures

CVE-2026-97485: omfs: handle set_blocksize failures

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

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

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

omfs: handle set_blocksize failures

omfs uses buffer_heads, which don't handle block size > PAGE_SIZE well.
Without this, mounting we will hit the

        BUG_ON(offset >= folio_size(folio));

in folio_set_bh on the first __bread_gfp call.

The Linux kernel CVE team has assigned CVE-2026-97485 to this issue.


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

	Fixed in 6.12.111 with commit 61ffc31cd8642d7a950b6831720629c8331365f6
	Fixed in 6.18.53 with commit fd4d6593c51253c79be422d6ae42e318250e20a7
	Fixed in 7.2 with commit 18c3d6fcb557f920c9143711497625e70153874c

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-2026-97485
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/omfs/inode.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/61ffc31cd8642d7a950b6831720629c8331365f6
	https://git.kernel.org/stable/c/fd4d6593c51253c79be422d6ae42e318250e20a7
	https://git.kernel.org/stable/c/18c3d6fcb557f920c9143711497625e70153874c