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CVE-2023-53520

Bluetooth: Fix hci_suspend_sync crash

MEDIUM
4.7
CVSS Score
Published: October 1, 2025 at 11:46 AM UTC
Updated: October 15, 2026 at 10:17 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
MEDIUM4.7
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
5.7 ≤ v < 6.1.556.2 ≤ v < 6.5.55.79952d90ea2885d7cbf80cd233f694f09a9c0eaec
Vendor states this is fixed in 06e2b5ad72b60f90bfe565c201346532e271f484 (fixed)
Vendor states this is fixed in 573ebae162111063eedc6c838a659ba628f66a0f (fixed)
Vendor states this is fixed in e1fa25a91091bbed691ba2996a6cee809e3309a2 (fixed)
Vendor states this is fixed in f9c8ce5d665653e3cf71a76349d41d7a7f7947e6 (fixed)
Vendor states this is fixed in 5.15.199 (unaffected)
Vendor states this is fixed in 5.7 (unaffected)
Vendor states this is fixed in 6.1.55 (unaffected)
Vendor states this is fixed in 6.5.5 (unaffected)
Vendor states this is fixed in 6.6 (unaffected)

References (4)

Patch
Source: cverecord
https://git.kernel.org/stable/c/06e2b5ad72b60f90bfe565c201346532e271f484
Patch
Source: cverecord
https://git.kernel.org/stable/c/f9c8ce5d665653e3cf71a76349d41d7a7f7947e6
Patch
Source: cverecord
https://git.kernel.org/stable/c/573ebae162111063eedc6c838a659ba628f66a0f
Patch
Source: cverecord
https://git.kernel.org/stable/c/e1fa25a91091bbed691ba2996a6cee809e3309a2

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.7MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-362

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