CVE-2022-50386

Kernel compromise via L2CAP channel use-after-free

Published Sep 18, 2025 · Updated Sep 18, 2025

Use-after-free in Bluetooth L2CAP in affected Linux kernel releases allows attackers to compromise the kernel via Bluetooth proximity. l2cap_connect_create_rsp obtains an l2cap_chan pointer without first retaining it, so concurrent channel teardown can free the object before the response path locks it. An unauthenticated Bluetooth peer within radio range can control the signaling and teardown race, leading to kernel memory disclosure, corruption, control-flow hijacking, or panic.

CVSS severity8.8
High
EPSS probability0.36%
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 Bluetooth L2CAP in affected Linux kernel releases allows attackers to compromise the kernel via Bluetooth proximity. l2cap_connect_create_rsp obtains an l2cap_chan pointer without first retaining it, so concurrent channel teardown can free the object before the response path locks it. An unauthenticated Bluetooth peer within radio range can control the signaling and teardown race, leading to kernel memory disclosure, corruption, control-flow hijacking, or panic.

The record

CVE
CVE-2022-50386
Published
Sep 18, 2025
Updated
Sep 18, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1210
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0c108cf3ad386e0084277093b55a351c49e0be27
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <11e40d6c0823f699d8ad501e48d1c3ae4be386cd
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <15fc21695eb606bdc5d483b92118ee42610a952d
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <35fcbc4243aad7e7d020b7c1dfb14bb888b20a4f
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6ffde6e03085874ae22263ff4cef4869f797e84f
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7d6f9cb24d2b2f6b6370eac074e2e6b1bafdad45
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <843fc4e386dd84b806a7f07fb062d8c3a44e5364
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d1e894f950ad48897d1a7cb05909ea29d8c3810e
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d91fc2836562f299f34e361e089e9fe154da4f73

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0c108cf3ad386e0084277093b55a351c49e0be27; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <11e40d6c0823f699d8ad501e48d1c3ae4be386cd; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <15fc21695eb606bdc5d483b92118ee42610a952d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <35fcbc4243aad7e7d020b7c1dfb14bb888b20a4f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6ffde6e03085874ae22263ff4cef4869f797e84f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7d6f9cb24d2b2f6b6370eac074e2e6b1bafdad45; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <843fc4e386dd84b806a7f07fb062d8c3a44e5364; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d1e894f950ad48897d1a7cb05909ea29d8c3810e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d91fc2836562f299f34e361e089e9fe154da4f73

Published CVSS scores

8.0CISA-ADPCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8kernel.orgCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.0NIST NVDCVSS:3.1/AV:A/AC:L/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

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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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1210Exploitation of Remote Services

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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