CVE-2022-3103Public exploit

Kernel crash via out-of-range sync cancellation index

Published Sep 26, 2022 · Updated May 21, 2025

An off-by-one error in Linux Kernel io_uring 6.0-rc2 allows local users to crash the kernel through a sync-cancellation request. In __io_sync_cancel, a fixed-file index equal to nr_user_files passes a greater-than check and indexes one slot beyond the registered-file table. A local user able to invoke io_uring_register with fixed-file cancellation can trigger the demonstrated null-pointer dereference and system crash.

CVSS severity7.8
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An off-by-one error in Linux Kernel io_uring 6.0-rc2 allows local users to crash the kernel through a sync-cancellation request. In __io_sync_cancel, a fixed-file index equal to nr_user_files passes a greater-than check and indexes one slot beyond the registered-file table. A local user able to invoke io_uring_register with fixed-file cancellation can trigger the demonstrated null-pointer dereference and system crash.

The record

CVE
CVE-2022-3103
Published
Sep 26, 2022
Updated
May 21, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-193, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 26, 2022CVE publishedPublication date reported by the CVE source.
  2. May 21, 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?

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  1. Affected versionversion=6.0-rc3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.0-rc3

Published CVSS scores

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

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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-193Off-by-one Error
T1068Exploitation for Privilege Escalation

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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