CVE-2025-38370

Filesystem transaction abort via duplicate free-space entries

Published Jul 25, 2025 · Updated May 11, 2026

Denial of service in btrfs in Linux 6.14 through 6.15.5 and 6.16-rc1 through 6.16-rc4 allows local users to abort a transaction. During a multi-transaction rebuild, btrfs_create_pending_block_groups() adds entries for a new block group, then populate_free_space_tree() adds them again and returns -EEXIST. Reaching the rebuild path requires CAP_SYS_ADMIN in the initial user namespace and a btrfs mount or remount; the observed consequence is a filesystem transaction abort.

CVSS severity6.8
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in btrfs in Linux 6.14 through 6.15.5 and 6.16-rc1 through 6.16-rc4 allows local users to abort a transaction. During a multi-transaction rebuild, btrfs_create_pending_block_groups() adds entries for a new block group, then populate_free_space_tree() adds them again and returns -EEXIST. Reaching the rebuild path requires CAP_SYS_ADMIN in the initial user namespace and a btrfs mount or remount; the observed consequence is a filesystem transaction abort.

The record

CVE
CVE-2025-38370
Published
Jul 25, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jul 25, 2025CVE 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=6.14
  2. Affected versionversion=882af9f13e830c0a4ef696bb72cd5998a5067a93 <1e6ed33cabba8f06f532f2e5851a102602823734
  3. Affected versionversion=882af9f13e830c0a4ef696bb72cd5998a5067a93 <88fdd4899ea9bfe6cf943f099fcf8ad5df153782

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=6.14; version=882af9f13e830c0a4ef696bb72cd5998a5067a93 <1e6ed33cabba8f06f532f2e5851a102602823734; version=882af9f13e830c0a4ef696bb72cd5998a5067a93 <88fdd4899ea9bfe6cf943f099fcf8ad5df153782

Published CVSS scores

5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/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.

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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