High 7.8Published Oct 1, 2025

CVE-2023-53520Bluetooth: Fix hci_suspend_sync crash

Updated under an hour ago (Oct 27, 2026, 10:00 PM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: Fix hci_suspend_sync crash If hci_unregister_dev() frees the hci_dev object but hci_suspend_notifier may still be accessing it, it can cause the program to crash. Here's the call trace: <4>[102152.653246] Call Trace: <4>[102152.653254] hci_suspend_sync+0x109/0x301 [bluetooth] <4>[102152.653259] hci_suspend_dev+0x78/0xcd [bluetooth] <4>[102152.653263] hci_suspend_notifier+0x42/0x7a [bluetooth] <4>[102152.653268] notifier_call_chain+0x43/0x6b <4>[102152.653271] __blocking_notifier_call_chain+0x48/0x69 <4>[102152.653273] __pm_notifier_call_chain+0x22/0x39 <4>[102152.653276] pm_suspend+0x287/0x57c <4>[102152.653278] state_store+0xae/0xe5 <4>[102152.653281] kernfs_fop_write+0x109/0x173 <4>[102152.653284] __vfs_write+0x16f/0x1a2 <4>[102152.653287] ? selinux_file_permission+0xca/0x16f <4>[102152.653289] ? security_file_permission+0x36/0x109 <4>[102152.653291] vfs_write+0x114/0x21d <4>[102152.653293] __x64_sys_write+0x7b/0xdb <4>[102152.653296] do_syscall_64+0x59/0x194 <4>[102152.653299] entry_SYSCALL_64_after_hwframe+0x5c/0xc1 This patch holds the reference count of the hci_dev object while processing it in hci_suspend_notifier to avoid potential crash caused by the race condition.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 9952d90ea2885d7cbf80cd233f694f09a9c0eaec before e1fa25a91091bbed691ba2996a6cee809e3309a2; 9952d90ea2885d7cbf80cd233f694f09a9c0eaec builds before 06e2b5ad72b60f90bfe565c201346532e271f484; from 9952d90ea2885d7cbf80cd233f694f09a9c0eaec before f9c8ce5d665653e3cf71a76349d41d7a7f7947e6; 9952d90ea2885d7cbf80cd233f694f09a9c0eaec builds before 573ebae162111063eedc6c838a659ba628f66a0f	CNA record
linux linux_kernel linux:linux_kernel	from 5.7 before 6.1.55; from 6.2 before 6.5.5	NVD

References

References

https://git.kernel.org/stable/c/e1fa25a91091bbed691ba2996a6cee809e3309a2	patch
https://git.kernel.org/stable/c/06e2b5ad72b60f90bfe565c201346532e271f484	patch
https://git.kernel.org/stable/c/f9c8ce5d665653e3cf71a76349d41d7a7f7947e6	patch
https://git.kernel.org/stable/c/573ebae162111063eedc6c838a659ba628f66a0f	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.