From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 86DDF25BEFD for ; Mon, 28 Jul 2025 11:23:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753701818; cv=none; b=IY7t5qYjmDgUEPKr65EGdoHty7dvuPSue5Hd/O8AE+9EZ2W8B55jLYV8txqU26IjcbY6rFVmA2va4syWHd7ee5PSm7ZvnJHTVn7eVp2o8P/YaWN6bJmQhargLkA0JuxcpcA4bOr+Bb4VDGqc/an8qcAUrkGZ1HC9IZe+y+sKbks= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753701818; c=relaxed/simple; bh=W1qWoWnYNleoLSkyPAf4T4WsTK9J0cTm02N2tJcK5x8=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=qhsNhY5oJlQe78heKRLoFMw9hu7gj5nX2UR/DnhIdkcn7XcDuT8MZlNQqg71ogevOYN9CjiIP8DTpPIuh+RuPjtS5deq+MUX2fTQjek5C5IAbZNQRhkEtlVrZQ7l2fdMzLRVivsrmHOwgIIRbavXGt6jTPZ8HAXVCSukwl42MRI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=FTu0eBkX; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="FTu0eBkX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E580EC4CEF8; Mon, 28 Jul 2025 11:23:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1753701818; bh=W1qWoWnYNleoLSkyPAf4T4WsTK9J0cTm02N2tJcK5x8=; h=From:To:Cc:Subject:Date:Reply-to:From; b=FTu0eBkX/AMLXKUJ80XHH6LsV2+kJprS/bAZVoek3U8LJ+BFkKA4CHo2ergsErzbI leV25j+abiJEHNIrtJLAKcTXGmj5cUohv6xU1ZahBcB1HkJYugo42seZR+KGicOAT3 4hTzCVc1/uwrAwuEZhllGMzDmAicE93k27ORObDM= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2025-38473: Bluetooth: Fix null-ptr-deref in l2cap_sock_resume_cb() Date: Mon, 28 Jul 2025 13:22:16 +0200 Message-ID: <2025072812-CVE-2025-38473-e8bb@gregkh> X-Mailer: git-send-email 2.50.1 Precedence: bulk X-Mailing-List: linux-cve-announce@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Reply-to: , X-Developer-Signature: v=1; a=openpgp-sha256; l=4755; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=+g55EZ4lkRmkP8iFgvGYUgrSr/7O8UcAA2EEVIilPLU=; b=owGbwMvMwCRo6H6F97bub03G02pJDBntsSmH7b1XTkz92c5VcVGm45bfru26wevr/xjEFle+M 25gu+vREcvCIMjEICumyPJlG8/R/RWHFL0MbU/DzGFlAhnCwMUpABPJ6WeYK591ITz5o9gFjb8Z y1lYd6ju00g6zrCg43/TZUsJCfYqy8VT3r2bp37tQZ43AA== X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Content-Transfer-Encoding: 8bit From: Greg Kroah-Hartman Description =========== In the Linux kernel, the following vulnerability has been resolved: Bluetooth: Fix null-ptr-deref in l2cap_sock_resume_cb() syzbot reported null-ptr-deref in l2cap_sock_resume_cb(). [0] l2cap_sock_resume_cb() has a similar problem that was fixed by commit 1bff51ea59a9 ("Bluetooth: fix use-after-free error in lock_sock_nested()"). Since both l2cap_sock_kill() and l2cap_sock_resume_cb() are executed under l2cap_sock_resume_cb(), we can avoid the issue simply by checking if chan->data is NULL. Let's not access to the killed socket in l2cap_sock_resume_cb(). [0]: BUG: KASAN: null-ptr-deref in instrument_atomic_write include/linux/instrumented.h:82 [inline] BUG: KASAN: null-ptr-deref in clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline] BUG: KASAN: null-ptr-deref in l2cap_sock_resume_cb+0xb4/0x17c net/bluetooth/l2cap_sock.c:1711 Write of size 8 at addr 0000000000000570 by task kworker/u9:0/52 CPU: 1 UID: 0 PID: 52 Comm: kworker/u9:0 Not tainted 6.16.0-rc4-syzkaller-g7482bb149b9f #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: hci0 hci_rx_work Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:501 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_report+0x58/0x84 mm/kasan/report.c:524 kasan_report+0xb0/0x110 mm/kasan/report.c:634 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:189 __kasan_check_write+0x20/0x30 mm/kasan/shadow.c:37 instrument_atomic_write include/linux/instrumented.h:82 [inline] clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline] l2cap_sock_resume_cb+0xb4/0x17c net/bluetooth/l2cap_sock.c:1711 l2cap_security_cfm+0x524/0xea0 net/bluetooth/l2cap_core.c:7357 hci_auth_cfm include/net/bluetooth/hci_core.h:2092 [inline] hci_auth_complete_evt+0x2e8/0xa4c net/bluetooth/hci_event.c:3514 hci_event_func net/bluetooth/hci_event.c:7511 [inline] hci_event_packet+0x650/0xe9c net/bluetooth/hci_event.c:7565 hci_rx_work+0x320/0xb18 net/bluetooth/hci_core.c:4070 process_one_work+0x7e8/0x155c kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3402 kthread+0x5fc/0x75c kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847 The Linux kernel CVE team has assigned CVE-2025-38473 to this issue. Affected and fixed versions =========================== Issue introduced in 3.13 with commit d97c899bde330cd1c76c3a162558177563a74362 and fixed in 6.1.147 with commit ac3a8147bb24314fb3e84986590148e79f9872ec Issue introduced in 3.13 with commit d97c899bde330cd1c76c3a162558177563a74362 and fixed in 6.6.100 with commit c4f16f6b071a74ac7eefe5c28985285cbbe2cd96 Issue introduced in 3.13 with commit d97c899bde330cd1c76c3a162558177563a74362 and fixed in 6.12.40 with commit b97be7ee8a1cd96b89817cbd64a9f5cc16c17d08 Issue introduced in 3.13 with commit d97c899bde330cd1c76c3a162558177563a74362 and fixed in 6.15.8 with commit 6d63901dcd592a1e3f71d7c6d78f9be5e8d7eef0 Issue introduced in 3.13 with commit d97c899bde330cd1c76c3a162558177563a74362 and fixed in 6.16 with commit a0075accbf0d76c2dad1ad3993d2e944505d99a0 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-2025-38473 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: net/bluetooth/l2cap_sock.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/ac3a8147bb24314fb3e84986590148e79f9872ec https://git.kernel.org/stable/c/c4f16f6b071a74ac7eefe5c28985285cbbe2cd96 https://git.kernel.org/stable/c/b97be7ee8a1cd96b89817cbd64a9f5cc16c17d08 https://git.kernel.org/stable/c/6d63901dcd592a1e3f71d7c6d78f9be5e8d7eef0 https://git.kernel.org/stable/c/a0075accbf0d76c2dad1ad3993d2e944505d99a0