CVE-2022-28389

Local kernel crash via double-freed transmit buffer

Published Apr 3, 2022 · Updated Aug 3, 2024

A double free in the Linux kernel through 5.17.1 allows local users to crash the system by triggering a failed MCBA USB CAN transmission. In mcba_usb_start_xmit, can_put_echo_skb consumes the original socket buffer, but the USB submission error path calls dev_kfree_skb on that buffer again while can_free_echo_skb releases its echo copy. Exploitation requires local access to transmit through the Microchip CAN BUS Analyzer driver and an error from usb_submit_urb; the bounded consequence is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A double free in the Linux kernel through 5.17.1 allows local users to crash the system by triggering a failed MCBA USB CAN transmission. In mcba_usb_start_xmit, can_put_echo_skb consumes the original socket buffer, but the USB submission error path calls dev_kfree_skb on that buffer again while can_free_echo_skb releases its echo copy. Exploitation requires local access to transmit through the Microchip CAN BUS Analyzer driver and an error from usb_submit_urb; the bounded consequence is a kernel crash.

The record

CVE
CVE-2022-28389
Published
Apr 3, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-415, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
2.1NIST NVDAV:L/AC:L/Au:N/C:N/I:N/A:P

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-415Double Free
T1499.004Application 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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