CVE-2024-43891Public exploit

Kernel crash via trace event use-after-free

Published Aug 26, 2024 · Updated Aug 5, 2026

Use-after-free in Linux kernel tracing 6.6.33 through 6.6.48 and 6.9 through 6.10.4 allows local users to crash the kernel. The format file retains a direct call pointer and fails to honor EVENT_FILE_FL_FREED, so a read can dereference an event after its metadata is freed. Triggering the race requires low-privileged tracefs access, CONFIG_USER_EVENTS, event deletion, and concurrent format reads; the bounded consequence is a kernel crash.

CVSS severity4.7
Medium
EPSS probability0.24%
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 6.6.33 through 6.6.48 and 6.9 through 6.10.4 allows local users to crash the kernel. The format file retains a direct call pointer and fails to honor EVENT_FILE_FL_FREED, so a read can dereference an event after its metadata is freed. Triggering the race requires low-privileged tracefs access, CONFIG_USER_EVENTS, event deletion, and concurrent format reads; the bounded consequence is a kernel crash.

The record

CVE
CVE-2024-43891
Published
Aug 26, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 26, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=14aa4f3efc6e784847e8c8543a7ef34ec9bdbb01 <4ed03758ddf0b19d69eed69386d65a92d0091e0c
  2. Affected versionversion=6.6.33 <6.6.49
  3. Affected versionversion=6.9
  4. Affected versionversion=b63db58e2fa5d6963db9c45df88e60060f0ff35f <531dc6780d94245af037c25c2371c8caf652f0f9
  5. Affected versionversion=b63db58e2fa5d6963db9c45df88e60060f0ff35f <b1560408692cd0ab0370cfbe9deb03ce97ab3f6d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=14aa4f3efc6e784847e8c8543a7ef34ec9bdbb01 <4ed03758ddf0b19d69eed69386d65a92d0091e0c; version=6.6.33 <6.6.49; version=6.9; version=b63db58e2fa5d6963db9c45df88e60060f0ff35f <531dc6780d94245af037c25c2371c8caf652f0f9; version=b63db58e2fa5d6963db9c45df88e60060f0ff35f <b1560408692cd0ab0370cfbe9deb03ce97ab3f6d

Published CVSS scores

4.7NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
6.4SUSECVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
4.7UbuntuCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
7.1SUSECVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1499.004Application or System Exploitation

Public exploit references

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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