linux-cve-announce - CVE-2025-38175: binder: fix yet another UAF in binder

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Message-ID: <2025070402-CVE-2025-38175-6701@gregkh>
Date: Fri,  4 Jul 2025 12:40:02 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38175: binder: fix yet another UAF in binder_devices

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

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

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

binder: fix yet another UAF in binder_devices

Commit e77aff5528a18 ("binderfs: fix use-after-free in binder_devices")
addressed a use-after-free where devices could be released without first
being removed from the binder_devices list. However, there is a similar
path in binder_free_proc() that was missed:

  ==================================================================
  BUG: KASAN: slab-use-after-free in binder_remove_device+0xd4/0x100
  Write of size 8 at addr ffff0000c773b900 by task umount/467
  CPU: 12 UID: 0 PID: 467 Comm: umount Not tainted 6.15.0-rc7-00138-g57483a362741 #9 PREEMPT
  Hardware name: linux,dummy-virt (DT)
  Call trace:
   binder_remove_device+0xd4/0x100
   binderfs_evict_inode+0x230/0x2f0
   evict+0x25c/0x5dc
   iput+0x304/0x480
   dentry_unlink_inode+0x208/0x46c
   __dentry_kill+0x154/0x530
   [...]

  Allocated by task 463:
   __kmalloc_cache_noprof+0x13c/0x324
   binderfs_binder_device_create.isra.0+0x138/0xa60
   binder_ctl_ioctl+0x1ac/0x230
  [...]

  Freed by task 215:
   kfree+0x184/0x31c
   binder_proc_dec_tmpref+0x33c/0x4ac
   binder_deferred_func+0xc10/0x1108
   process_one_work+0x520/0xba4
  [...]
  ==================================================================

Call binder_remove_device() within binder_free_proc() to ensure the
device is removed from the binder_devices list before being kfreed.

The Linux kernel CVE team has assigned CVE-2025-38175 to this issue.


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

	Issue introduced in 6.14 with commit 12d909cac1e1c4147cc3417fee804ee12fc6b984 and fixed in 6.14.11 with commit 4a7694f499cae5b83412c5281bf2c961f34f2ed6
	Issue introduced in 6.14 with commit 12d909cac1e1c4147cc3417fee804ee12fc6b984 and fixed in 6.15.2 with commit 72a726fb5f25fbb31d6060acfb671c1955831245
	Issue introduced in 6.14 with commit 12d909cac1e1c4147cc3417fee804ee12fc6b984 and fixed in 6.16-rc1 with commit 9857af0fcff385c75433f2162c30c62eb912ef6d

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-2025-38175
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:
	drivers/android/binder.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/4a7694f499cae5b83412c5281bf2c961f34f2ed6
	https://git.kernel.org/stable/c/72a726fb5f25fbb31d6060acfb671c1955831245
	https://git.kernel.org/stable/c/9857af0fcff385c75433f2162c30c62eb912ef6d