CVE-2023-1855

System crash and kernel disclosure via cleanup race

Published Apr 5, 2023 · Updated Feb 12, 2025

Use-after-free in the xgene-hwmon driver in Linux kernels before 6.3-rc3 allows local users to crash the system or disclose kernel data. xgene_hwmon_remove frees the asynchronous-message FIFO without first synchronizing queued work, allowing xgene_hwmon_evt_work to access the freed FIFO during device removal. Exploitation requires local low-privileged access and removal of an active X-Gene hardware-monitoring device while its queued work is running.

CVSS severity6.3
Medium
EPSS probability0.23%
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 xgene-hwmon driver in Linux kernels before 6.3-rc3 allows local users to crash the system or disclose kernel data. xgene_hwmon_remove frees the asynchronous-message FIFO without first synchronizing queued work, allowing xgene_hwmon_evt_work to access the freed FIFO during device removal. Exploitation requires local low-privileged access and removal of an active X-Gene hardware-monitoring device while its queued work is running.

The record

CVE
CVE-2023-1855
Published
Apr 5, 2023
Updated
Feb 12, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 5, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 12, 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 prior to Kernel 6.3 RC3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=Linux kernel prior to Kernel 6.3 RC3

Published CVSS scores

6.3CISACVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H
6.4OracleCVSS:3.0/AV:L/AC:H/PR:H/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.

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

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-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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