CVE-2022-3564

System crash via L2CAP receive race

Published Oct 17, 2022 · Updated Aug 3, 2024

Use-after-free in the Linux Kernel Bluetooth L2CAP subsystem allows local users to crash the system through a receive race. One flow queues an SKB while another dequeues and frees it; callers then access l2cap_ctrl data retained inside the freed buffer after l2cap_reassemble_sdu returns. Reachability requires local low-privileged access to exercise Bluetooth L2CAP receive paths, and the confirmed consequence is a system crash.

CVSS severity7.1
High
EPSS probability1.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux Kernel Bluetooth L2CAP subsystem allows local users to crash the system through a receive race. One flow queues an SKB while another dequeues and frees it; callers then access l2cap_ctrl data retained inside the freed buffer after l2cap_reassemble_sdu returns. Reachability requires local low-privileged access to exercise Bluetooth L2CAP receive paths, and the confirmed consequence is a system crash.

The record

CVE
CVE-2022-3564
Published
Oct 17, 2022
Updated
Aug 3, 2024
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-119, CWE-362, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 17, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=n/a

Published CVSS scores

5.5VulDB CNACVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
7.1NIST NVDCVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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