7.8

CVE-2023-53520: Bluetooth: Fix hci_suspend_sync crash

Modified
AliasesUBUNTU-CVE-2023-53520DEBIAN-CVE-2023-53520
Published 01-10-2025Last modified 15-10-2026

Vulnerability summary

CVE-2023-53520 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.12% chance of exploitation in the next 30 days, higher than 1.6% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.12%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 23 · Related 23
SUSE-SU-2025:03600-1SUSE-SU-2025:03634-1SUSE-SU-2025:20851-1SUSE-SU-2025:20861-1SUSE-SU-2025:20870-1SUSE-SU-2025:20898-1

Timeline

  1. 01-10-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.12%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.11% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu111 products
  • linux< 5.15.0-176.186
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1105.112
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 9952d90ea2885d7cbf80cd233f694f09a9c0eaec, < e1fa25a91091bbed691ba2996a6cee809e3309a2 | ≥ 9952d90ea2885d7cbf80cd233f694f09a9c0eaec, < 06e2b5ad72b60f90bfe565c201346532e271f484 | ≥ 9952d90ea2885d7cbf80cd233f694f09a9c0eaec, < f9c8ce5d665653e3cf71a76349d41d7a7f7947e6 | ≥ 9952d90ea2885d7cbf80cd233f694f09a9c0eaec, < 573ebae162111063eedc6c838a659ba628f66a0f | 5.7
  • linux_kernel≥ 5.7, < 6.1.55 | ≥ 6.2, < 6.5.5
Debian1 product
  • linux< 6.1.55-1 | < 6.5.6-1

3 vendors · 114 products

References

21 links
Show all 21 references