CVE-2022-50407

Local kernel crash via unbounded QoS value scan

Published Sep 18, 2025 · Updated Sep 18, 2025

Stack-based buffer overflow in the Linux kernel allows local users to crash the system through the HiSilicon QM QoS configuration interface. In qm_algqos_write(), sscanf parses a user-controlled string with unbounded %s conversions into val_buf, although that destination is only 32 bytes for input of up to 256 bytes. Reachability requires a loaded HiSilicon accelerator QM driver and access to its alg_qos debugfs control; debugfs is root-only by default, but mount options can broaden access.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in the Linux kernel allows local users to crash the system through the HiSilicon QM QoS configuration interface. In qm_algqos_write(), sscanf parses a user-controlled string with unbounded %s conversions into val_buf, although that destination is only 32 bytes for input of up to 256 bytes. Reachability requires a loaded HiSilicon accelerator QM driver and access to its alg_qos debugfs control; debugfs is root-only by default, but mount options can broaden access.

The record

CVE
CVE-2022-50407
Published
Sep 18, 2025
Updated
Sep 18, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-674, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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 <34c4f8ad45b4ea814c7ecc3f23a2d292959d5a52
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3efe90af4c0c46c58dba1b306de142827153d9c0
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fc521abb6ee4b8f06fdfc52646140dab6a2ed334

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <34c4f8ad45b4ea814c7ecc3f23a2d292959d5a52; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3efe90af4c0c46c58dba1b306de142827153d9c0; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fc521abb6ee4b8f06fdfc52646140dab6a2ed334

Published CVSS scores

5.5CISA ADPCVSS: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

CWE-674Uncontrolled Recursion
T1499.004Application or System Exploitation

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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