CVE-2022-50086

Kernel crash via duplicate rq_qos insertion

Published Jun 18, 2025 · Updated May 11, 2026

Race condition in affected Linux kernel versions allows local users to crash the system by concurrently writing the io.cost.qos file. The race creates two iocost instances for one disk, causing their shared root iocg walk_list to overwrite and corrupt list bookkeeping in ioc_timer_fn. Exploitation requires low-privileged local access and an enabled IO cost controller; the bounded consequence is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.18%
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 affected Linux kernel versions allows local users to crash the system by concurrently writing the io.cost.qos file. The race creates two iocost instances for one disk, causing their shared root iocg walk_list to overwrite and corrupt list bookkeeping in ioc_timer_fn. Exploitation requires low-privileged local access and an enabled IO cost controller; the bounded consequence is a kernel crash.

The record

CVE
CVE-2022-50086
Published
Jun 18, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record 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=4.19
  2. Affected versionversion=a79050434b45959f397042080fd1d70ffa9bd9df <08ef66e800a85afc6b54cb95841f6502627eee2e
  3. Affected versionversion=a79050434b45959f397042080fd1d70ffa9bd9df <0b7f5d7a4d2a72ad9de04ab8ccba2a31904aa638
  4. Affected versionversion=a79050434b45959f397042080fd1d70ffa9bd9df <0c9bb1acd1d103a3070b2126870eb52761d606ce
  5. Affected versionversion=a79050434b45959f397042080fd1d70ffa9bd9df <14a6e2eb7df5c7897c15b109cba29ab0c4a791b6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.19; version=a79050434b45959f397042080fd1d70ffa9bd9df <08ef66e800a85afc6b54cb95841f6502627eee2e; version=a79050434b45959f397042080fd1d70ffa9bd9df <0b7f5d7a4d2a72ad9de04ab8ccba2a31904aa638; version=a79050434b45959f397042080fd1d70ffa9bd9df <0c9bb1acd1d103a3070b2126870eb52761d606ce; version=a79050434b45959f397042080fd1d70ffa9bd9df <14a6e2eb7df5c7897c15b109cba29ab0c4a791b6

Published CVSS scores

5.5NIST NVDCVSS: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 exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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