CVE-2023-1670

Local privilege escalation via deferred-work use-after-free

Published Mar 30, 2023 · Updated Feb 14, 2025

Use-after-free in the Linux Kernel 6.3-rc4 Xircom PCMCIA Ethernet driver allows local users to crash the system or gain privileges. A timeout work item can execute do_reset after xirc2ps_detach frees its net_device because detachment does not cancel the queued work. Triggering the flaw requires local access, an active Xircom 16-bit PCMCIA adapter, and a timeout racing device removal.

CVSS severity7.8
High
EPSS probability0.27%
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 6.3-rc4 Xircom PCMCIA Ethernet driver allows local users to crash the system or gain privileges. A timeout work item can execute do_reset after xirc2ps_detach frees its net_device because detachment does not cancel the queued work. Triggering the flaw requires local access, an active Xircom 16-bit PCMCIA adapter, and a timeout racing device removal.

The record

CVE
CVE-2023-1670
Published
Mar 30, 2023
Updated
Feb 14, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 14, 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=Linux kernel 6.3-rc4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=Linux kernel 6.3-rc4

Published CVSS scores

7.8NISTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

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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