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NVD / CVE Program· CNA Linux

CVE-2023-53762: Bluetooth: hci_sync: Fix UAF in hci_disconnect_all_sync

Noroxi assessment

Priority: Monitor (action score 35/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.26% (FIRST EPSS).
  • Someone on the same network segment can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 5e3ee972f185eb7957ce789b3bf13a3cb790f178, 94d9ba9f9888b748d4abd2aa1547af56ae85f772, a30c074f0b5b7f909a15c978fbc96a29e2f94e42.

Low priority for now. Upgrade to Linux Linux 5e3ee972f185eb7957ce789b3bf13a3cb790f178, 94d9ba9f9888b748d4abd2aa1547af56ae85f772, a30c074f0b5b7f909a15c978fbc96a29e2f94e42 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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: <TASK> 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 </TASK> 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 ==================================================================

HighCVSS 8.8 · v3.1—No exploit Fix available
Published
Dec 8, 2025
Updated
Oct 3, 2026
EPSS
0.2% · 18th percentile
CWE
—

Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
8.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.17affected
    • 182ee45da083db4e3e621541ccf255bfa9652214 and later · before 5e3ee972f185eb7957ce789b3bf13a3cb790f178affected · git
    • 182ee45da083db4e3e621541ccf255bfa9652214 and later · before a30c074f0b5b7f909a15c978fbc96a29e2f94e42affected · git
    • 182ee45da083db4e3e621541ccf255bfa9652214 and later · before ba3ba53ce1f76fc372b8f918fece4f9b1e41acd4affected · git
    • 182ee45da083db4e3e621541ccf255bfa9652214 and later · before 94d9ba9f9888b748d4abd2aa1547af56ae85f772affected · git
    • before 5.17not affected · semver
    • 6.1.189 and later · up to and including 6.1.*not affected · semver
    • 6.4.16 and later · up to and including 6.4.*not affected · semver
    • 6.5.3 and later · up to and including 6.5.*not affected · semver
    • 6.6 and laternot affected · original_commit_for_fix

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8bpftoolbefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernelbefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-abi-stablelistsbefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-corebefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-cross-headersbefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-debugbefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-debug-corebefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-debug-develbefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-debug-modulesbefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-debug-modules-extrabefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-develbefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-docbefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-headersbefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-modulesbefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-modules-extrabefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-rtbefore 4.18.0-553.105.1.rt7.446.el8_104.18.0-553.105.1.rt7.446.el8_10
AlmaLinux:8kernel-rt-corebefore 4.18.0-553.105.1.rt7.446.el8_104.18.0-553.105.1.rt7.446.el8_10
AlmaLinux:8kernel-rt-debugbefore 4.18.0-553.105.1.rt7.446.el8_104.18.0-553.105.1.rt7.446.el8_10
AlmaLinux:8kernel-rt-debug-corebefore 4.18.0-553.105.1.rt7.446.el8_104.18.0-553.105.1.rt7.446.el8_10
AlmaLinux:8kernel-rt-debug-develbefore 4.18.0-553.105.1.rt7.446.el8_104.18.0-553.105.1.rt7.446.el8_10
AlmaLinux:8kernel-rt-debug-modulesbefore 4.18.0-553.105.1.rt7.446.el8_104.18.0-553.105.1.rt7.446.el8_10
AlmaLinux:8kernel-rt-debug-modules-extrabefore 4.18.0-553.105.1.rt7.446.el8_104.18.0-553.105.1.rt7.446.el8_10
AlmaLinux:8kernel-rt-develbefore 4.18.0-553.105.1.rt7.446.el8_104.18.0-553.105.1.rt7.446.el8_10
AlmaLinux:8kernel-rt-modulesbefore 4.18.0-553.105.1.rt7.446.el8_104.18.0-553.105.1.rt7.446.el8_10

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2023-53750Dec 8, 2025 · pinctrl: freescale: Fix a memory out of bounds when num_configs is 1
    0Monitor
  • ← EarlierCVE-2023-53753Dec 8, 2025 · drm/amd/display: fix mapping to non-allocated address
    31Monitor
  • Later →CVE-2023-53764Dec 8, 2025 · wifi: ath12k: Handle lock during peer_id find
    35Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux5e3ee972f185eb7957ce789b3bf13a3cb790f178Vendor (CNA)
Linux Linux94d9ba9f9888b748d4abd2aa1547af56ae85f772Vendor (CNA)
Linux Linuxa30c074f0b5b7f909a15c978fbc96a29e2f94e42Vendor (CNA)
Linux Linuxba3ba53ce1f76fc372b8f918fece4f9b1e41acd4Vendor (CNA)
almalinux:bpftool4.18.0-553.105.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel4.18.0-553.105.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-abi-stablelists4.18.0-553.105.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-core4.18.0-553.105.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-cross-headers4.18.0-553.105.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug4.18.0-553.105.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-core4.18.0-553.105.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-devel4.18.0-553.105.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-modules4.18.0-553.105.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-modules-extra4.18.0-553.105.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-devel4.18.0-553.105.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-doc4.18.0-553.105.1.el8_10 · AlmaLinux:8Package registry (OSV)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.5.3-1 · Debian:13Package registry (OSV)
opensuse:dtb-aarch646.4.0-150600.23.84.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-64kb6.4.0-150600.23.84.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-debug6.4.0-150600.23.84.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default6.4.0-150600.23.84.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default-base6.4.0-150600.23.84.1.150600.12.38.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-docs6.4.0-150600.23.84.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-kvmsmall6.4.0-150600.23.84.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-build6.4.0-150600.23.84.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-qa6.4.0-150600.23.84.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-source6.4.0-150600.23.84.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-syms6.4.0-150600.23.84.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-zfcpdump6.4.0-150600.23.84.1 · openSUSE:Leap 15.6Package registry (OSV)

+30

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone on the same network segment can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Adjacent
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records