linux-cve-announce - CVE-2025-40077: f2fs: fix to avoid overflow while left shift operation

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Message-ID: <2025102819-CVE-2025-40077-2313@gregkh>
Date: Tue, 28 Oct 2025 12:48:54 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40077: f2fs: fix to avoid overflow while left shift operation

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

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

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

f2fs: fix to avoid overflow while left shift operation

Should cast type of folio->index from pgoff_t to loff_t to avoid overflow
while left shift operation.

The Linux kernel CVE team has assigned CVE-2025-40077 to this issue.


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

	Issue introduced in 5.8 with commit 3265d3db1f16395cfc6b8ea9b31b4001d98d05ef and fixed in 6.17.3 with commit 57d3381dfb97ff73ddd18601017fec21cca80985
	Issue introduced in 5.8 with commit 3265d3db1f16395cfc6b8ea9b31b4001d98d05ef and fixed in 6.18-rc1 with commit 0fe1c6bec54ea68ed8c987b3890f2296364e77bb

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-2025-40077
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/f2fs/compress.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/57d3381dfb97ff73ddd18601017fec21cca80985
	https://git.kernel.org/stable/c/0fe1c6bec54ea68ed8c987b3890f2296364e77bb