Message-ID: <2025120941-CVE-2023-53796-4092@gregkh>
Date: Tue,  9 Dec 2025 09:02:17 +0900
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53796: f2fs: fix information leak in f2fs_move_inline_dirents()

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

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

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

f2fs: fix information leak in f2fs_move_inline_dirents()

When converting an inline directory to a regular one, f2fs is leaking
uninitialized memory to disk because it doesn't initialize the entire
directory block.  Fix this by zero-initializing the block.

This bug was introduced by commit 4ec17d688d74 ("f2fs: avoid unneeded
initializing when converting inline dentry"), which didn't consider the
security implications of leaking uninitialized memory to disk.

This was found by running xfstest generic/435 on a KMSAN-enabled kernel.

The Linux kernel CVE team has assigned CVE-2023-53796 to this issue.


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

	Issue introduced in 4.3 with commit 4ec17d688d74b6b7cb10043c57ff4818cde2b0ca and fixed in 4.14.308 with commit 4e3b4b170bd43db1d8a93a6bd0ea434b17cc86f7
	Issue introduced in 4.3 with commit 4ec17d688d74b6b7cb10043c57ff4818cde2b0ca and fixed in 4.19.276 with commit a6807ef0f3b3d8508d3b07a2e35de8a91820a014
	Issue introduced in 4.3 with commit 4ec17d688d74b6b7cb10043c57ff4818cde2b0ca and fixed in 5.4.235 with commit 2bef8314fcf94ddc27e22d03f237c0fafd00de33
	Issue introduced in 4.3 with commit 4ec17d688d74b6b7cb10043c57ff4818cde2b0ca and fixed in 5.10.173 with commit 00b5587326625d0fddb2a5f5a3d4acd950102ace
	Issue introduced in 4.3 with commit 4ec17d688d74b6b7cb10043c57ff4818cde2b0ca and fixed in 5.15.99 with commit 117d4f6687b1f74423b5d398ea95c63b262a8e73
	Issue introduced in 4.3 with commit 4ec17d688d74b6b7cb10043c57ff4818cde2b0ca and fixed in 6.1.16 with commit f07a8d61b6ea81bb3cbe0638af40f8824d6147fd
	Issue introduced in 4.3 with commit 4ec17d688d74b6b7cb10043c57ff4818cde2b0ca and fixed in 6.2.3 with commit eebaecef0095bb8f493c03982da75c6e7bae1056
	Issue introduced in 4.3 with commit 4ec17d688d74b6b7cb10043c57ff4818cde2b0ca and fixed in 6.3 with commit 9a5571cff4ffcfc24847df9fd545cc5799ac0ee5

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-2023-53796
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/inline.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/4e3b4b170bd43db1d8a93a6bd0ea434b17cc86f7
	https://git.kernel.org/stable/c/a6807ef0f3b3d8508d3b07a2e35de8a91820a014
	https://git.kernel.org/stable/c/2bef8314fcf94ddc27e22d03f237c0fafd00de33
	https://git.kernel.org/stable/c/00b5587326625d0fddb2a5f5a3d4acd950102ace
	https://git.kernel.org/stable/c/117d4f6687b1f74423b5d398ea95c63b262a8e73
	https://git.kernel.org/stable/c/f07a8d61b6ea81bb3cbe0638af40f8824d6147fd
	https://git.kernel.org/stable/c/eebaecef0095bb8f493c03982da75c6e7bae1056
	https://git.kernel.org/stable/c/9a5571cff4ffcfc24847df9fd545cc5799ac0ee5

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