CVE-2022-47946Public exploit

Local kernel crash via stale wait-queue entry

Published Dec 23, 2022 · Updated Apr 15, 2025

Use-after-free in io_sqpoll_wait_sq in Linux kernel 5.10 through 5.10.154 allows local users to crash the kernel via io_uring. The function jumps to its out path when ctx->sqo_dead is set, skipping finish_wait and leaving a stack wait_queue_entry linked after its lifetime. Triggering requires low-privileged local access and a forked process that quickly closes a copied io_uring descriptor; the bounded result is a kernel crash and service interruption.

CVSS severity5.5
Medium
EPSS probability0.37%
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_sqpoll_wait_sq in Linux kernel 5.10 through 5.10.154 allows local users to crash the kernel via io_uring. The function jumps to its out path when ctx->sqo_dead is set, skipping finish_wait and leaving a stack wait_queue_entry linked after its lifetime. Triggering requires low-privileged local access and a forked process that quickly closes a copied io_uring descriptor; the bounded result is a kernel crash and service interruption.

The record

CVE
CVE-2022-47946
Published
Dec 23, 2022
Updated
Apr 15, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 23, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CanonicalCVSS: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.

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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-416Use After Free
T1499.004Application or System Exploitation

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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