CVE-2023-0468Public exploit

Local system crash via poll cancellation race

Published Jan 25, 2023 · Updated Apr 1, 2025

Use-after-free in io_uring polling in Linux Kernel before 6.1-rc7 allows local users to crash the system via concurrent poll cancellation. io_poll_check_events and io_poll_cancel_req race while updating poll_refs, allowing duplicate completion to free a request before another path uses it. Low-privileged local access and successful race timing are required; the grounded consequence is a NULL-pointer dereference and system crash.

CVSS severity4.7
Medium
EPSS probability0.28%
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 io_uring polling in Linux Kernel before 6.1-rc7 allows local users to crash the system via concurrent poll cancellation. io_poll_check_events and io_poll_cancel_req race while updating poll_refs, allowing duplicate completion to free a request before another path uses it. Low-privileged local access and successful race timing are required; the grounded consequence is a NULL-pointer dereference and system crash.

The record

CVE
CVE-2023-0468
Published
Jan 25, 2023
Updated
Apr 1, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 25, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 1, 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 6.1 RC7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=Linux Kernel prior to Kernel 6.1 RC7

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7CanonicalCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7NVDCVSS:3.1/AV:L/AC:H/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.

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1499Endpoint Denial of Service

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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