CVE-2023-0469

System crash via duplicate io_uring file release

Published Jan 25, 2023 · Updated Apr 1, 2025

Use-after-free in the Linux kernel's io_uring fixed-file installation before 6.1-rc7 allows local users to crash the system. On an io_install_fixed_file error path, the function calls fput even though its callers also release the same file reference, underflowing the reference count and leaving cleanup code to access freed memory. Low-privileged local access and an allocation failure during fixed-file installation are required; the grounded consequence is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.32%
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's io_uring fixed-file installation before 6.1-rc7 allows local users to crash the system. On an io_install_fixed_file error path, the function calls fput even though its callers also release the same file reference, underflowing the reference count and leaving cleanup code to access freed memory. Low-privileged local access and an allocation failure during fixed-file installation are required; the grounded consequence is a kernel crash.

The record

CVE
CVE-2023-0469
Published
Jan 25, 2023
Updated
Apr 1, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, CWE-191, T1499.004
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 t oKernel 6.1 RC7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=Linux Kernel prior t oKernel 6.1 RC7

Published CVSS scores

5.5CISA-ADPCVSS: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.

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
CWE-191Integer Underflow (Wrap or Wraparound)
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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