CVE-2022-1198Public exploit

Kernel crash via rearmed 6pack transmit timer

Published Aug 29, 2022 · Updated Aug 2, 2024

Use-after-free in the Linux Kernel 6pack driver before 5.17-rc6 allows local users to crash the kernel through an emulated AX.25 device. During 6pack device teardown, sp_xmit_on_air can rearm a timer after sixpack_close synchronizes it, then pty_write dereferences a released tty_struct. Exploitation requires local syscall access and a kernel with 6pack support; successful triggering interrupts the entire host by crashing the kernel.

CVSS severity5.5
Medium
EPSS probability0.43%
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 Linux Kernel 6pack driver before 5.17-rc6 allows local users to crash the kernel through an emulated AX.25 device. During 6pack device teardown, sp_xmit_on_air can rearm a timer after sixpack_close synchronizes it, then pty_write dereferences a released tty_struct. Exploitation requires local syscall access and a kernel with 6pack support; successful triggering interrupts the entire host by crashing the kernel.

The record

CVE
CVE-2022-1198
Published
Aug 29, 2022
Updated
Aug 2, 2024
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 29, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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?

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

  1. Affected versionversion=Fixed in kernel v5.17-rc6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=Fixed in kernel v5.17-rc6

Published CVSS scores

5.1SUSECVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/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.

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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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free

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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