CVE-2023-2430Public exploit

System crash via unlocked IOPOLL overflow

Published Jul 23, 2023 · Updated Mar 6, 2025

Race condition in Linux Kernel before 6.2-rc5 allows local users to crash the system through IOPOLL completion overflow. The io_cqring_event_overflow() path queues an overflow completion for an IOPOLL ring without holding the ring mutex, allowing concurrent access to violate the locking invariant. A low-privileged local process must create and overflow an IOPOLL io_uring; successful triggering crashes the host rather than exposing or changing data.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux Kernel before 6.2-rc5 allows local users to crash the system through IOPOLL completion overflow. The io_cqring_event_overflow() path queues an overflow completion for an IOPOLL ring without holding the ring mutex, allowing concurrent access to violate the locking invariant. A low-privileged local process must create and overflow an IOPOLL io_uring; successful triggering crashes the host rather than exposing or changing data.

The record

CVE
CVE-2023-2430
Published
Jul 23, 2023
Updated
Mar 6, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-667, CWE-413, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 23, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 6, 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=Kernel Linux prior to Kernel 6.2 RC5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=Kernel Linux prior to Kernel 6.2 RC5

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.6Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/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 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 exploitPublished

Weakness, pattern, technique

CWE-667Improper Locking
CWE-413Improper Resource Locking
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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