linux-cve-announce - CVE-2025-68784: xfs: fix a UAF problem in xattr repair

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Message-ID: <2026011302-CVE-2025-68784-b1e0@gregkh>
Date: Tue, 13 Jan 2026 16:29:10 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-68784: xfs: fix a UAF problem in xattr repair

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

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

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

xfs: fix a UAF problem in xattr repair

The xchk_setup_xattr_buf function can allocate a new value buffer, which
means that any reference to ab->value before the call could become a
dangling pointer.  Fix this by moving an assignment to after the buffer
setup.

The Linux kernel CVE team has assigned CVE-2025-68784 to this issue.


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

	Issue introduced in 6.10 with commit e47dcf113ae348678143cc935a1183059c02c9ad and fixed in 6.12.64 with commit 1e2d3aa19c7962b9474b22893160cb460494c45f
	Issue introduced in 6.10 with commit e47dcf113ae348678143cc935a1183059c02c9ad and fixed in 6.18.3 with commit d29ed9ff972afe17c215cab171761d7a15d7063f
	Issue introduced in 6.10 with commit e47dcf113ae348678143cc935a1183059c02c9ad and fixed in 6.19-rc2 with commit 5990fd756943836978ad184aac980e2b36ab7e01

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-2025-68784
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/xfs/scrub/attr_repair.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/1e2d3aa19c7962b9474b22893160cb460494c45f
	https://git.kernel.org/stable/c/d29ed9ff972afe17c215cab171761d7a15d7063f
	https://git.kernel.org/stable/c/5990fd756943836978ad184aac980e2b36ab7e01