CVE-2022-49006

Kernel crash via reused dynamic-event type identifiers

Published Oct 21, 2024 · Updated May 11, 2026

Use-after-free in Linux kernel tracing allows local users with tracing privileges to crash the kernel through dynamic events. Removing a traced dynamic event leaves its ring-buffer records intact, so a later event can reuse the 16-bit type identifier and parse stale records with incompatible logic. The trigger requires privileged tracing access and 65,536 event create-remove cycles; the bounded consequence is a kernel crash.

CVSS severity7.8
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux kernel tracing allows local users with tracing privileges to crash the kernel through dynamic events. Removing a traced dynamic event leaves its ring-buffer records intact, so a later event can reuse the 16-bit type identifier and parse stale records with incompatible logic. The trigger requires privileged tracing access and 65,536 event create-remove cycles; the bounded consequence is a kernel crash.

The record

CVE
CVE-2022-49006
Published
Oct 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2024CVE 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=2.6.33
  2. Affected versionversion=77b44d1b7c28360910cdbd427fb62d485c08674c <1603feac154ff38514e8354e3079a455eb4801e2
  3. Affected versionversion=77b44d1b7c28360910cdbd427fb62d485c08674c <417d5ea6e735e5d88ffb6c436cf2938f3f476dd1
  4. Affected versionversion=77b44d1b7c28360910cdbd427fb62d485c08674c <4313e5a613049dfc1819a6dfb5f94cf2caff9452
  5. Affected versionversion=77b44d1b7c28360910cdbd427fb62d485c08674c <be111ebd8868d4b7c041cb3c6102e1ae27d6dc1d
  6. Affected versionversion=77b44d1b7c28360910cdbd427fb62d485c08674c <c52d0c8c4f38f7580cff61c4dfe1034c580cedfd

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.33; version=77b44d1b7c28360910cdbd427fb62d485c08674c <1603feac154ff38514e8354e3079a455eb4801e2; version=77b44d1b7c28360910cdbd427fb62d485c08674c <417d5ea6e735e5d88ffb6c436cf2938f3f476dd1; version=77b44d1b7c28360910cdbd427fb62d485c08674c <4313e5a613049dfc1819a6dfb5f94cf2caff9452; version=77b44d1b7c28360910cdbd427fb62d485c08674c <be111ebd8868d4b7c041cb3c6102e1ae27d6dc1d; version=77b44d1b7c28360910cdbd427fb62d485c08674c <c52d0c8c4f38f7580cff61c4dfe1034c580cedfd

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-416Use After Free
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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