CVE-2022-50554

Kernel panic via duplicate queue_rq dispatch

Published Oct 7, 2025 · Updated Oct 7, 2025

Race condition in the Linux kernel blk-mq subsystem allows local users to trigger a kernel panic through delayed request queuing. A request can time out after blk_mq_start_request() begins queue_rq but before hardware submission, letting the timeout handler requeue it and invoke queue_rq twice. Triggering the race requires a virtual-machine scheduling delay, vCPU preemption latency, or a long vCPU page fault; the resulting impact is a host kernel panic.

CVSS severity5.5
Medium
EPSS probability0.20%
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 the Linux kernel blk-mq subsystem allows local users to trigger a kernel panic through delayed request queuing. A request can time out after blk_mq_start_request() begins queue_rq but before hardware submission, letting the timeout handler requeue it and invoke queue_rq twice. Triggering the race requires a virtual-machine scheduling delay, vCPU preemption latency, or a long vCPU page fault; the resulting impact is a host kernel panic.

The record

CVE
CVE-2022-50554
Published
Oct 7, 2025
Updated
Oct 7, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 7, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7a73c54a3750895888ab586896736c9434e062a1
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <82c229476b8f6afd7e09bc4dc77d89dc19ff7688
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8b3d6b029a552d2978bbac275303d11419826a69

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7a73c54a3750895888ab586896736c9434e062a1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <82c229476b8f6afd7e09bc4dc77d89dc19ff7688; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8b3d6b029a552d2978bbac275303d11419826a69

Published CVSS scores

5.5Canonical UbuntuCVSS: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 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

T1499Endpoint Denial of Service

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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