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Vulnerabilities

Vulnerability · CVE-2023-53520

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_susp…

Published Oct 1, 2025 · catalog updated Oct 15, 2026 · linux kernel

Check if you run it

No confirmed exploitation is on record for CVE-2023-53520. EPSS is 0.11%. Act only if a listed version of linux kernel is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium4.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.11%
Remediation
Advisory link
Affected products
cpe linux/linux kernel

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: [102152.653246] Call Trace: [102152.653254] hci_suspend_sync+0x109/0x301 [bluetooth] [102152.653259] hci_suspend_dev+0x78/0xcd [bluetooth] [102152.653263] hci_suspend_notifier+0x42/0x7a [bluetooth] [102152.653268] notifier_call_chain+0x43/0x6b [102152.653271] __blocking_notifier_call_chain+0x48/0x69 [102152.653273] __pm_notifier_call_chain+0x22/0x39 [102152.653276] pm_suspend+0x287/0x57c [102152.653278] state_store+0xae/0xe5 [102152.653281] kernfs_fop_write+0x109/0x173 [102152.653284] __vfs_write+0x16f/0x1a2 [102152.653287] ? selinux_file_permission+0xca/0x16f [102152.653289] ? security_file_permission+0x36/0x109 [102152.653291] vfs_write+0x114/0x21d [102152.653293] __x64_sys_write+0x7b/0xdb [102152.653296] do_syscall_64+0x59/0x194 [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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe linux/linux kernelversion unspecified

How to fix CVE-2023-53520

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2023-53520. EPSS is 0.11%. Act only if a listed version of linux kernel is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-362: Race Condition. EPSS 0.11%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 1, 2025 · NIST NVD

    Detected

    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: [102152.653246] Call Trace: [102152.653254] hci_suspend_sync+0x109/0x301 [bluetooth] [102152.653259] hci_suspend_dev+0x78/0xcd [bluetoo

  2. Oct 15, 2026 · NIST NVD

    Updated

    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: [102152.653246] Call Trace: [102152.653254] hci_suspend_sync+0x109/0x301 [bluetooth] [102152.653259] hci_suspend_dev+0x78/0xcd [bluetoo

Sources

  • CVE.orgVulnerability recordCVE-2023-53520

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2023-53520

    30-day exploitation probability 0.1%

    first.org
  • NIST NVDVulnerability recordCVE-2023-53520

    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: [102152.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.