linux-cve-announce - CVE-2025-22000: mm/huge_memory: drop beyond-EOF folios with the right number of refs

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Message-ID: <2025040349-CVE-2025-22000-50c3@gregkh>
Date: Thu,  3 Apr 2025 08:17:52 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-22000: mm/huge_memory: drop beyond-EOF folios with the right number of refs

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

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

mm/huge_memory: drop beyond-EOF folios with the right number of refs

When an after-split folio is large and needs to be dropped due to EOF,
folio_put_refs(folio, folio_nr_pages(folio)) should be used to drop all
page cache refs.  Otherwise, the folio will not be freed, causing memory
leak.

This leak would happen on a filesystem with blocksize > page_size and a
truncate is performed, where the blocksize makes folios split to >0 order
ones, causing truncated folios not being freed.

The Linux kernel CVE team has assigned CVE-2025-22000 to this issue.


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

	Issue introduced in 6.9 with commit c010d47f107f609b9f4d6a103b6dfc53889049e9 and fixed in 6.12.21 with commit 86368616a9ce51f6b41efa251b6e066893851d67
	Issue introduced in 6.9 with commit c010d47f107f609b9f4d6a103b6dfc53889049e9 and fixed in 6.13.9 with commit 92ad820a1f2d95d5a8d6c2bd3f391bbb068a5f9e
	Issue introduced in 6.9 with commit c010d47f107f609b9f4d6a103b6dfc53889049e9 and fixed in 6.14 with commit 14efb4793519d73fb2902bb0ece319b886e4b4b9

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-2025-22000
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:
	mm/huge_memory.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/86368616a9ce51f6b41efa251b6e066893851d67
	https://git.kernel.org/stable/c/92ad820a1f2d95d5a8d6c2bd3f391bbb068a5f9e
	https://git.kernel.org/stable/c/14efb4793519d73fb2902bb0ece319b886e4b4b9