CVE-2022-3176

Local code execution via unhandled POLLFREE notification

Published Sep 16, 2022 · Updated Apr 21, 2025

Use-after-free in the io_uring subsystem of Linux Kernel allows local users to crash the system or execute arbitrary code. The io_uring poll path fails to process a POLLFREE notification when signalfd_poll() or binder_poll() frees a task-owned waitqueue, leaving a stale waiter reference. A local user must submit an io_uring poll request for a signalfd or binder file descriptor; successful exploitation can interrupt service or run code in kernel context.

CVSS severity7.8
High
EPSS probability0.30%
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 io_uring subsystem of Linux Kernel allows local users to crash the system or execute arbitrary code. The io_uring poll path fails to process a POLLFREE notification when signalfd_poll() or binder_poll() frees a task-owned waitqueue, leaving a stale waiter reference. A local user must submit an io_uring poll request for a signalfd or binder file descriptor; successful exploitation can interrupt service or run code in kernel context.

The record

CVE
CVE-2022-3176
Published
Sep 16, 2022
Updated
Apr 21, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 16, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <fc78b2fc21f10c4c9c4d5d659a685710ffa63659

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=unspecified <fc78b2fc21f10c4c9c4d5d659a685710ffa63659

Published CVSS scores

7.8CanonicalCVSS: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

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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

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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