CVE-2022-49799

Kernel memory disclosure and crash via double unregister

Published May 1, 2025 · Updated May 11, 2026

Out-of-bounds read in Linux kernel tracing allows local users to disclose kernel memory or crash the system through synthetic-event registration. The register_synth_event() error path invokes __unregister_trace_event() through trace_remove_event_call() and then invokes it again when set_synth_event_print_fmt() fails. Local low-privileged access to synthetic-event creation is required; the second unregister can access freed kernel memory and terminate the host.

CVSS severity7.1
High
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

Out-of-bounds read in Linux kernel tracing allows local users to disclose kernel memory or crash the system through synthetic-event registration. The register_synth_event() error path invokes __unregister_trace_event() through trace_remove_event_call() and then invokes it again when set_synth_event_print_fmt() fails. Local low-privileged access to synthetic-event creation is required; the second unregister can access freed kernel memory and terminate the host.

The record

CVE
CVE-2022-49799
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 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=4.17
  2. Affected versionversion=4b147936fa509650beaf638b331573c23ba4d609 <1b5f1c34d3f5a664a57a5a7557a50e4e3cc2505c
  3. Affected versionversion=4b147936fa509650beaf638b331573c23ba4d609 <315b149f08229a233d47532eb5da1707b28f764c
  4. Affected versionversion=4b147936fa509650beaf638b331573c23ba4d609 <6517b97134f724d12f673f9fb4f456d75c7a905f
  5. Affected versionversion=4b147936fa509650beaf638b331573c23ba4d609 <a5bfa53e5036b3e7a80be902dd3719a930accabd

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.17; version=4b147936fa509650beaf638b331573c23ba4d609 <1b5f1c34d3f5a664a57a5a7557a50e4e3cc2505c; version=4b147936fa509650beaf638b331573c23ba4d609 <315b149f08229a233d47532eb5da1707b28f764c; version=4b147936fa509650beaf638b331573c23ba4d609 <6517b97134f724d12f673f9fb4f456d75c7a905f; version=4b147936fa509650beaf638b331573c23ba4d609 <a5bfa53e5036b3e7a80be902dd3719a930accabd

Published CVSS scores

7.1NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.1Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

CWE-125Out-of-bounds Read

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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