CVE-2022-3619Public exploit

Memory exhaustion via unreleased L2CAP start fragments

Published Oct 20, 2022 · Updated Apr 15, 2025

Resource leak in the Linux Kernel Bluetooth L2CAP stack allows attackers to exhaust kernel memory with malformed ACL start fragments. When a start fragment omits the L2CAP length, l2cap_recv_acldata copies its socket buffer into conn->rx_skb without releasing the original buffer. Reachability requires control of Bluetooth ACL input, and published assessments disagree on whether local privileges are required.

CVSS severity4.3
Medium
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leak in the Linux Kernel Bluetooth L2CAP stack allows attackers to exhaust kernel memory with malformed ACL start fragments. When a start fragment omits the L2CAP length, l2cap_recv_acldata copies its socket buffer into conn->rx_skb without releasing the original buffer. Reachability requires control of Bluetooth ACL input, and published assessments disagree on whether local privileges are required.

The record

CVE
CVE-2022-3619
Published
Oct 20, 2022
Updated
Apr 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, CWE-404, T1499.001
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 20, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=n/a

Published CVSS scores

3.5VulDBCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
4.3NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
CWE-404Improper Resource Shutdown or Release
T1499.001OS Exhaustion Flood

Public exploit references

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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