CVE-2024-38306Public exploit

Kernel crash via unlocked extent-buffer folio detach

Published Jun 25, 2024 · Updated Aug 5, 2026

Race condition in Linux 6.8 through 6.9.4 allows local users to crash the kernel via concurrent Btrfs extent-buffer handling. The grab_extent_buffer and release_extent_buffer paths can detach the same folio::private pointer without mapping->i_private_lock, causing two puts and a folio reference-count underflow. Triggering the narrow race requires activity on a middle page of a multi-page extent buffer and can terminate the running kernel.

CVSS severity4.7
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Race condition in Linux 6.8 through 6.9.4 allows local users to crash the kernel via concurrent Btrfs extent-buffer handling. The grab_extent_buffer and release_extent_buffer paths can detach the same folio::private pointer without mapping->i_private_lock, causing two puts and a folio reference-count underflow. Triggering the narrow race requires activity on a middle page of a multi-page extent buffer and can terminate the running kernel.

The record

CVE
CVE-2024-38306
Published
Jun 25, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, CWE-617, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 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=09e6cef19c9fc0e10547135476865b5272aa0406 <952f048eb901881a7cc6f7c1368b53cd386ead7b
  2. Affected versionversion=09e6cef19c9fc0e10547135476865b5272aa0406 <f3a5367c679d31473d3fbb391675055b4792c309
  3. Affected versionversion=6.8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=09e6cef19c9fc0e10547135476865b5272aa0406 <952f048eb901881a7cc6f7c1368b53cd386ead7b; version=09e6cef19c9fc0e10547135476865b5272aa0406 <f3a5367c679d31473d3fbb391675055b4792c309; version=6.8

Published CVSS scores

4.7NIST NVDCVSS:3.1/AV:L/AC:H/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.

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

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 exploitPublished

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-617Reachable Assertion
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo