CVE-2022-49470

Kernel memory corruption via post-hci_recv_frame event dereference

Published Feb 26, 2025 · Updated Aug 5, 2026

Use-after-free in the btmtksdio Bluetooth driver in Linux allows physically proximate attackers to corrupt kernel memory via HCI events. The btmtksdio_recv_event function passes an event skb to hci_recv_frame, which can free the buffer asynchronously, and then dereferences hdr->evt from that freed storage. Reachability requires Bluetooth to be enabled with an operational MediaTek SDIO controller; exploitation can panic the kernel or hijack kernel control flow.

CVSS severity8.8
High
EPSS probability0.31%
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 btmtksdio Bluetooth driver in Linux allows physically proximate attackers to corrupt kernel memory via HCI events. The btmtksdio_recv_event function passes an event skb to hci_recv_frame, which can free the buffer asynchronously, and then dereferences hdr->evt from that freed storage. Reachability requires Bluetooth to be enabled with an operational MediaTek SDIO controller; exploitation can panic the kernel or hijack kernel control flow.

The record

CVE
CVE-2022-49470
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record 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=5.2
  2. Affected versionversion=9aebfd4a2200ab8075e44379c758bccefdc589bb <01c6a899fa6be4f4cbf60c4f44f0f6691155415f
  3. Affected versionversion=9aebfd4a2200ab8075e44379c758bccefdc589bb <02ba31e09a26e8cd4582ac8e6163d80284997727
  4. Affected versionversion=9aebfd4a2200ab8075e44379c758bccefdc589bb <0fab6361c4ba17d1b43a991bef4238a3c1754d35
  5. Affected versionversion=9aebfd4a2200ab8075e44379c758bccefdc589bb <b3cec8a42fcd11d05313c724f27e01b1db77522c

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.2; version=9aebfd4a2200ab8075e44379c758bccefdc589bb <01c6a899fa6be4f4cbf60c4f44f0f6691155415f; version=9aebfd4a2200ab8075e44379c758bccefdc589bb <02ba31e09a26e8cd4582ac8e6163d80284997727; version=9aebfd4a2200ab8075e44379c758bccefdc589bb <0fab6361c4ba17d1b43a991bef4238a3c1754d35; version=9aebfd4a2200ab8075e44379c758bccefdc589bb <b3cec8a42fcd11d05313c724f27e01b1db77522c

Published CVSS scores

7.8CISA ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8Linux Kernel CNACVSS:3.1/AV:A/AC:L/PR:N/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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499Endpoint Denial of Service

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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