CVE-2024-26616

System crash via duplicate btrfs scrub completion

Published Feb 29, 2024 · Updated May 11, 2026

Use-after-free in Linux 6.4 through 6.6.14 and 6.7 through 6.7.2 allows local users to crash the system during a btrfs scrub. scrub_submit_initial_read builds a 64K bio past the end of a shorter final chunk; btrfs_submit_bio splits it, and the first endio callback frees bbio::bio before the second callback uses its bvec. Triggering the crash requires local access sufficient to start scrub on an ext4-converted btrfs filesystem whose data chunk length is not 64K aligned.

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 6.4 through 6.6.14 and 6.7 through 6.7.2 allows local users to crash the system during a btrfs scrub. scrub_submit_initial_read builds a 64K bio past the end of a shorter final chunk; btrfs_submit_bio splits it, and the first endio callback frees bbio::bio before the second callback uses its bvec. Triggering the crash requires local access sufficient to start scrub on an ext4-converted btrfs filesystem whose data chunk length is not 64K aligned.

The record

CVE
CVE-2024-26616
Published
Feb 29, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 29, 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

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=6.4
  2. Affected versionversion=e02ee89baa66c40e1002cf8b09141fce7265e0f5 <34de0f04684ec00c093a0455648be055f0e8e24f
  3. Affected versionversion=e02ee89baa66c40e1002cf8b09141fce7265e0f5 <642b9c520ef2f104277ad1f902f8526edbe087fb
  4. Affected versionversion=e02ee89baa66c40e1002cf8b09141fce7265e0f5 <f546c4282673497a06ecb6190b50ae7f6c85b02f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.4; version=e02ee89baa66c40e1002cf8b09141fce7265e0f5 <34de0f04684ec00c093a0455648be055f0e8e24f; version=e02ee89baa66c40e1002cf8b09141fce7265e0f5 <642b9c520ef2f104277ad1f902f8526edbe087fb; version=e02ee89baa66c40e1002cf8b09141fce7265e0f5 <f546c4282673497a06ecb6190b50ae7f6c85b02f

Published CVSS scores

7.8NISTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

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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