CVE-2022-48984

Local kernel crash via unflushed SLCAN work

Published Oct 21, 2024 · Updated May 11, 2026

A NULL pointer dereference in Linux 6.0 through 6.0.12 allows local users to crash the kernel through the SLCAN TTY interface. slcan_close() frees the SLCAN transmit-work structure without flushing scheduled tx_work, leaving a kernel worker to dereference freed state. Reachability requires local access to feed bytes into an SLCAN TTY and force a write wakeup while its network device was never brought up; the result is a host-level kernel crash.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A NULL pointer dereference in Linux 6.0 through 6.0.12 allows local users to crash the kernel through the SLCAN TTY interface. slcan_close() frees the SLCAN transmit-work structure without flushing scheduled tx_work, leaving a kernel worker to dereference freed state. Reachability requires local access to feed bytes into an SLCAN TTY and force a write wakeup while its network device was never brought up; the result is a host-level kernel crash.

The record

CVE
CVE-2022-48984
Published
Oct 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=6.0
  2. Affected versionversion=cfcb4465e9923bb9ac168abcea84e880633f9cef <9e2709d58a14a10eb00d919acd7dec071c33f8c8
  3. Affected versionversion=cfcb4465e9923bb9ac168abcea84e880633f9cef <fb855e9f3b6b42c72af3f1eb0b288998fe0d5ebb

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.0; version=cfcb4465e9923bb9ac168abcea84e880633f9cef <9e2709d58a14a10eb00d919acd7dec071c33f8c8; version=cfcb4465e9923bb9ac168abcea84e880633f9cef <fb855e9f3b6b42c72af3f1eb0b288998fe0d5ebb

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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-476NULL Pointer Dereference
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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