CVE-2026-74414: hfsplus: Remove the duplicate attr inode dirty marking action

From: Greg Kroah-Hartman <[email protected]>

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

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

hfsplus: Remove the duplicate attr inode dirty marking action

Syzbot reported a null-ptr-deref in [1].
If the attributes file is not loaded during system mount, a trigger
occurs [1] when setxattr is executed in userspace.

Remove the first mark attr inode dirty operation.

[1]
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
Call Trace:
 hfsplus_setxattr+0x124/0x340 fs/hfsplus/xattr.c:555
 hfsplus_trusted_setxattr+0x40/0x60 fs/hfsplus/xattr_trusted.c:30
 __vfs_setxattr+0x43c/0x480 fs/xattr.c:218
 __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:252
 vfs_setxattr+0x163/0x360 fs/xattr.c:339
 do_setxattr fs/xattr.c:654 [inline]

The Linux kernel CVE team has assigned CVE-2026-74414 to this issue.


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

	Issue introduced in 7.1 with commit ee8422d00b7cfa028823ebf1f28bf9dea428cac3 and fixed in 7.1.5 with commit b3c7ccb1a93cbb5a9a13196abf608ffa2516817e
	Issue introduced in 7.1 with commit ee8422d00b7cfa028823ebf1f28bf9dea428cac3 and fixed in 7.2-rc1 with commit 7a41fd2b32e5908f19a68732008d581c167279dd

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-2026-74414
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/hfsplus/xattr.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/b3c7ccb1a93cbb5a9a13196abf608ffa2516817e
	https://git.kernel.org/stable/c/7a41fd2b32e5908f19a68732008d581c167279dd