CVE-2023-53762

HIGHPre-NVD 8.88.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2025-12-08. A secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 4 sources updated this week

Also known asEUVD-2023-60066 (ENISA EUVD) · GHSA-v6x6-vgmm-x298 (GitHub Security Advisories)Source: ENISA EUVD

8.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 8.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_sync: Fix UAF in hci_disconnect_all_sync

Use-after-free can occur in hci_disconnect_all_sync if a connection is deleted by concurrent processing of a controller event.

To prevent this the code now tries to iterate over the list backwards to ensure the links are cleanup before its parents, also it no longer relies on a cursor, instead it always uses the last element since hci_abort_conn_sync is guaranteed to call hci_conn_del.

UAF crash log: ================================================================== BUG: KASAN: slab-use-after-free in hci_set_powered_sync (net/bluetooth/hci_sync.c:5424) [bluetooth] Read of size 8 at addr ffff888009d9c000 by task kworker/u9:0/124

CPU: 0 PID: 124 Comm: kworker/u9:0 Tainted: G W 6.5.0-rc1+ #10 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-1.fc38 04/01/2014 Workqueue: hci0 hci_cmd_sync_work [bluetooth] Call Trace: dump_stack_lvl+0x5b/0x90 print_report+0xcf/0x670 ? __virt_addr_valid+0xdd/0x160 ? hci_set_powered_sync+0x2c9/0x4a0 [bluetooth] kasan_report+0xa6/0xe0 ? hci_set_powered_sync+0x2c9/0x4a0 [bluetooth] ? __pfx_set_powered_sync+0x10/0x10 [bluetooth] hci_set_powered_sync+0x2c9/0x4a0 [bluetooth] ? __pfx_hci_set_powered_sync+0x10/0x10 [bluetooth] ? __pfx_lock_release+0x10/0x10 ? __pfx_set_powered_sync+0x10/0x10 [bluetooth] hci_cmd_sync_work+0x137/0x220 [bluetooth] process_one_work+0x526/0x9d0 ? __pfx_process_one_work+0x10/0x10 ? __pfx_do_raw_spin_lock+0x10/0x10 ? mark_held_locks+0x1a/0x90 worker_thread+0x92/0x630 ? __pfx_worker_thread+0x10/0x10 kthread+0x196/0x1e0 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x2c/0x50

Allocated by task 1782: kasan_save_stack+0x33/0x60 kasan_set_track+0x25/0x30 __kasan_kmalloc+0x8f/0xa0 hci_conn_add+0xa5/0xa80 [bluetooth] hci_bind_cis+0x881/0x9b0 [bluetooth] iso_connect_cis+0x121/0x520 [bluetooth] iso_sock_connect+0x3f6/0x790 [bluetooth] __sys_connect+0x109/0x130 __x64_sys_connect+0x40/0x50 do_syscall_64+0x60/0x90 entry_SYSCALL_64_after_hwframe+0x6e/0xd8

Freed by task 695: kasan_save_stack+0x33/0x60 kasan_set_track+0x25/0x30 kasan_save_free_info+0x2b/0x50 __kasan_slab_free+0x10a/0x180 __kmem_cache_free+0x14d/0x2e0 device_release+0x5d/0xf0 kobject_put+0xdf/0x270 hci_disconn_complete_evt+0x274/0x3a0 [bluetooth] hci_event_packet+0x579/0x7e0 [bluetooth] hci_rx_work+0x287/0xaa0 [bluetooth] process_one_work+0x526/0x9d0 worker_thread+0x92/0x630 kthread+0x196/0x1e0 ret_from_fork+0x2c/0x50 ==================================================================

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity88% × 45%
Impact severity (EG Severity): CVSS 8.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
16th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (8.8): severity, escalated by confirmed exploitation. This CVE's 8.8 is its impact severity (EG Severity), not escalated.

EG Severity
8.8 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-02). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

December 8, 2025

Last Modified

October 3, 2026

Advisory Details (3)

Auto-updated Aug 4, 2026
Patch available.
Web page

Bluetooth: hci_sync: Fix UAF in hci_disconnect_all_sync - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/94d9ba9f9888b748d4abd2aa1547af56ae85f772
Web page

Bluetooth: hci_sync: Fix UAF in hci_disconnect_all_sync - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ba3ba53ce1f76fc372b8f918fece4f9b1e41acd4
Web page

Bluetooth: hci_sync: Fix UAF in hci_disconnect_all_sync - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a30c074f0b5b7f909a15c978fbc96a29e2f94e42

Vendor Advisories for CVE-2023-53762(6)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(6)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatkernel-0:5.14.0-284.158.1.el9_22026-02-25redhat
redhatkernel-rt-0:5.14.0-284.158.1.rt14.443.el9_22026-02-25redhat
redhatkernel-rt-0:4.18.0-553.105.1.rt7.446.el8_102026-02-17redhat
redhatkernel-0:4.18.0-553.105.1.el8_102026-02-16redhat
redhatkernel-0:5.14.0-427.13.1.el9_42024-04-30redhat
linuxKernel @ 6.4.16 (fixes >=5.17.0)—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 7.2~rc7-1~exp1 (360 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 6.5.3-1: fixed in 6.5.3-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 6.5.3-1: fixed in 6.5.3-1
—

Data Freshness Timeline

(refreshed 12× in last 7d / 42× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 94 of 242 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 6 repeat rows among the latest 100 are merged into the row they repeat. The 148 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-03 08:22 UTCEG score recompute
  2. 2026-11-03 08:22 UTCVendor advisory
  3. 2026-11-03 08:22 UTCGHSA enrichmentGHSA-v6x6-vgmm-x298 · GitHub severity HIGH · GitHub CVSS 8.8
  4. 2026-11-02 16:40 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  5. 2026-11-01 16:31 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  6. 2026-10-30 16:31 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  7. 2026-10-29 16:30 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  8. 2026-10-28 16:29 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  9. 2026-10-27 20:11 UTCEG score recompute
  10. 2026-10-27 20:11 UTCVendor advisory
  11. 2026-10-27 20:11 UTCGHSA enrichmentGHSA-v6x6-vgmm-x298 · GitHub severity HIGH · GitHub CVSS 8.8
  12. 2026-10-27 16:29 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  13. 2026-10-26 16:29 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  14. 2026-10-25 17:27 UTCEG score recompute
  15. 2026-10-25 16:30 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  16. 2026-10-24 16:29 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  17. 2026-10-23 16:29 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  18. 2026-10-22 16:31 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  19. 2026-10-21 16:29 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  20. 2026-10-20 21:14 UTCEG score recompute
  21. 2026-10-20 21:14 UTCVendor advisory
  22. 2026-10-20 21:14 UTCGHSA enrichmentGHSA-v6x6-vgmm-x298 · GitHub severity HIGH · GitHub CVSS 8.8
  23. 2026-10-20 16:30 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  24. 2026-10-19 16:29 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  25. 2026-10-18 16:29 UTCEPSS rescoreEPSS 0.2% · 14th percentile
Show 69 more
  1. 2026-10-18 07:40 UTCEG score recompute
  2. 2026-10-17 16:30 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  3. 2026-10-16 16:36 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  4. 2026-10-15 16:29 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  5. 2026-10-14 16:30 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  6. 2026-10-13 16:30 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  7. 2026-10-12 18:12 UTCEG score recompute
  8. 2026-10-12 16:31 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  9. 2026-10-11 21:37 UTCEG score recompute
  10. 2026-10-11 13:45 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  11. 2026-10-10 19:58 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  12. 2026-10-09 20:05 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  13. 2026-10-08 17:06 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  14. 2026-10-07 23:46 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  15. 2026-10-06 15:15 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  16. 2026-10-05 17:41 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  17. 2026-10-04 23:20 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  18. 2026-10-03 14:23 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  19. 2026-10-03 11:36 UTCEG score recompute
  20. 2026-10-03 11:36 UTCVendor advisory
  21. 2026-10-03 11:36 UTCGHSA enrichmentGHSA-v6x6-vgmm-x298 · GitHub severity HIGH · GitHub CVSS 8.8
  22. 2026-10-01 19:48 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  23. 2026-10-01 05:10 UTCOSV refresh
  24. 2026-09-30 16:37 UTCEG score recompute
  25. 2026-09-30 15:01 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  26. 2026-09-29 15:17 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  27. 2026-09-28 13:49 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  28. 2026-09-26 00:22 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  29. 2026-09-24 14:01 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  30. 2026-09-23 13:46 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  31. 2026-09-20 20:14 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  32. 2026-09-18 19:26 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  33. 2026-09-16 14:06 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  34. 2026-09-16 05:11 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  35. 2026-09-15 03:08 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  36. 2026-09-13 16:45 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  37. 2026-09-12 14:58 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  38. 2026-09-12 07:10 UTCOSV refresh
  39. 2026-09-11 14:51 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  40. 2026-09-11 09:34 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  41. 2026-09-08 21:58 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  42. 2026-09-07 15:59 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  43. 2026-09-06 13:46 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  44. 2026-09-05 15:26 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  45. 2026-09-04 13:58 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  46. 2026-09-04 05:04 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  47. 2026-09-02 14:10 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  48. 2026-09-01 13:52 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  49. 2026-09-01 04:36 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  50. 2026-08-30 19:15 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  51. 2026-08-30 01:20 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  52. 2026-08-28 21:39 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  53. 2026-08-27 14:23 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  54. 2026-08-26 14:44 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  55. 2026-08-25 13:47 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  56. 2026-08-24 12:22 UTCOSV refresh
  57. 2026-08-23 00:17 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  58. 2026-08-21 23:47 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  59. 2026-08-20 22:53 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  60. 2026-08-19 17:02 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  61. 2026-08-18 13:46 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  62. 2026-08-16 14:54 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  63. 2026-08-16 02:12 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  64. 2026-08-15 01:28 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  65. 2026-08-13 21:58 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  66. 2026-08-12 13:49 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  67. 2026-08-11 13:40 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  68. 2026-08-10 23:58 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  69. 2026-08-09 13:44 UTCEPSS rescoreEPSS 0.2% · 15th percentile

Related CVEs(same vendor)

Frequently asked(5)

What is CVE-2023-53762?
CVE-2023-53762 is a high-severity vulnerability; its CVE record was published on December 8, 2025. In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: Fix UAF in hci_disconnect_all_sync Use-after-free can occur in hci_disconnect_all_sync if a connection is deleted by concurrent processing of a controller event. To prevent this the code now tries to iterate…
When was the CVE record for CVE-2023-53762 published?
The CVE record for CVE-2023-53762 was published on December 8, 2025. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 3, 2026; the record at its source may have been updated since.
Is CVE-2023-53762 actively exploited?
CVE-2023-53762 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (16th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2023-53762?
CVE-2023-53762 has a CVSS base score of 8.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2023-53762?
A fix for CVE-2023-53762 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2023-53762 are linked in the Vendor Advisories panel on this page.

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