CVE-2022-50648

Service hang via recursive ftrace mutex acquisition

Published Dec 9, 2025 · Updated May 11, 2026

Deadlock in ftrace in Linux kernel 6.0 through 6.0.2 allows local users to hang kernel direct-call modification operations. ftrace_modify_direct_caller calls register_ftrace_function, which reacquires direct_mutex while modify_ftrace_direct already holds that mutex. Reaching the path requires high privileges and a module that uses ftrace direct modification; the documented consequence is an availability interruption.

CVSS severity5.6
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

Deadlock in ftrace in Linux kernel 6.0 through 6.0.2 allows local users to hang kernel direct-call modification operations. ftrace_modify_direct_caller calls register_ftrace_function, which reacquires direct_mutex while modify_ftrace_direct already holds that mutex. Reaching the path requires high privileges and a module that uses ftrace direct modification; the documented consequence is an availability interruption.

The record

CVE
CVE-2022-50648
Published
Dec 9, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Dec 9, 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=53cd885bc5c3ea283cc9c00ca6446c778f00bfba <2482eacb685b6500e158268befbe6c90de5f166a
  2. Affected versionversion=53cd885bc5c3ea283cc9c00ca6446c778f00bfba <9d2ce78ddcee159eb6a97449e9c68b6d60b9cec4
  3. Affected versionversion=6.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=53cd885bc5c3ea283cc9c00ca6446c778f00bfba <2482eacb685b6500e158268befbe6c90de5f166a; version=53cd885bc5c3ea283cc9c00ca6446c778f00bfba <9d2ce78ddcee159eb6a97449e9c68b6d60b9cec4; version=6.0

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.6SUSECVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
4.1SUSECVSS:3.1/AV:L/AC:H/PR:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

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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