CVE-2024-39496

Local kernel memory corruption via stale device pointer

Published Jul 12, 2024 · Updated Aug 5, 2026

Use-after-free in Linux btrfs allows local users to corrupt kernel memory during concurrent zoned-filesystem device replacement. The btrfs_load_zone_info() path keeps a device pointer taken from the chunk map outside the device-replace rwsem, so replacement can free the device before the function finishes using it. Reachability requires low-privileged local write access to a mounted zoned btrfs filesystem while source-device replacement and block-group creation overlap.

CVSS severity7.8
High
EPSS probability0.29%
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 btrfs allows local users to corrupt kernel memory during concurrent zoned-filesystem device replacement. The btrfs_load_zone_info() path keeps a device pointer taken from the chunk map outside the device-replace rwsem, so replacement can free the device before the function finishes using it. Reachability requires low-privileged local write access to a mounted zoned btrfs filesystem while source-device replacement and block-group creation overlap.

The record

CVE
CVE-2024-39496
Published
Jul 12, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 12, 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

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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=5.11
  2. Affected versionversion=5b316468983dfa9473ff0f1c42e4e30b4c267141 <0090d6e1b210551e63cf43958dc7a1ec942cdde9
  3. Affected versionversion=5b316468983dfa9473ff0f1c42e4e30b4c267141 <092571ef9a812566c8f2c9038d9c2a64c49788d6
  4. Affected versionversion=5b316468983dfa9473ff0f1c42e4e30b4c267141 <17765964703b88d8befd899f8501150bb7e07e43
  5. Affected versionversion=5b316468983dfa9473ff0f1c42e4e30b4c267141 <a0cc006f4214b87e70983c692e05bb36c59b5752

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.11; version=5b316468983dfa9473ff0f1c42e4e30b4c267141 <0090d6e1b210551e63cf43958dc7a1ec942cdde9; version=5b316468983dfa9473ff0f1c42e4e30b4c267141 <092571ef9a812566c8f2c9038d9c2a64c49788d6; version=5b316468983dfa9473ff0f1c42e4e30b4c267141 <17765964703b88d8befd899f8501150bb7e07e43; version=5b316468983dfa9473ff0f1c42e4e30b4c267141 <a0cc006f4214b87e70983c692e05bb36c59b5752

Published CVSS scores

7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Linux kernel CNACVSS: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
T1068Exploitation for Privilege Escalation

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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