linux-cve-announce - CVE-2025-21815: mm/compaction: fix UBSAN shift-out-of-bounds warning

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Message-ID: <2025022709-CVE-2025-21815-19c9@gregkh>
Date: Thu, 27 Feb 2025 12:03:12 -0800
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21815: mm/compaction: fix UBSAN shift-out-of-bounds warning

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

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

mm/compaction: fix UBSAN shift-out-of-bounds warning

syzkaller reported a UBSAN shift-out-of-bounds warning of (1UL << order)
in isolate_freepages_block().  The bogus compound_order can be any value
because it is union with flags.  Add back the MAX_PAGE_ORDER check to fix
the warning.

The Linux kernel CVE team has assigned CVE-2025-21815 to this issue.


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

	Issue introduced in 6.7 with commit 3da0272a4c7d0d37b47b28e87014f421296fc2be and fixed in 6.12.14 with commit 4491159774d973a9e2e998d25d8fbb20fada6dfa
	Issue introduced in 6.7 with commit 3da0272a4c7d0d37b47b28e87014f421296fc2be and fixed in 6.13.3 with commit 10b7d3eb535098ccd4c82a182a33655d8a0e5c88
	Issue introduced in 6.7 with commit 3da0272a4c7d0d37b47b28e87014f421296fc2be and fixed in 6.14-rc1 with commit d1366e74342e75555af2648a2964deb2d5c92200

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-2025-21815
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/compaction.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/4491159774d973a9e2e998d25d8fbb20fada6dfa
	https://git.kernel.org/stable/c/10b7d3eb535098ccd4c82a182a33655d8a0e5c88
	https://git.kernel.org/stable/c/d1366e74342e75555af2648a2964deb2d5c92200