CVE-2022-1199Network attack vector

Kernel crash via AX.25 teardown race

Published Aug 29, 2022 · Updated Apr 23, 2025

Null pointer dereference and use-after-free in Linux Kernel before 5.18-rc4 allow remote attackers to crash the kernel via AX.25 amateur-radio traffic. The net/ax25/af_ax25.c teardown path races ax25_disconnect() with ax25_destroy_socket(), allowing ax25->sk to become NULL or freed while dereferenced. Exploitation requires AX.25 protocol activity and causes denial of service; no confidentiality or integrity impact is reported.

CVSS severity7.5
High
EPSS probability2.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference and use-after-free in Linux Kernel before 5.18-rc4 allow remote attackers to crash the kernel via AX.25 amateur-radio traffic. The net/ax25/af_ax25.c teardown path races ax25_disconnect() with ax25_destroy_socket(), allowing ax25->sk to become NULL or freed while dereferenced. Exploitation requires AX.25 protocol activity and causes denial of service; no confidentiality or integrity impact is reported.

The record

CVE
CVE-2022-1199
Published
Aug 29, 2022
Updated
Apr 23, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, CWE-416, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 29, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 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=Fixed in kernel v5.18-rc4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=Fixed in kernel v5.18-rc4

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
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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