Linux Kernel up to 6.18.9 btrfs __cow_file_range_inline denial of service

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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in Linux Kernel up to 6.18.9. This affects the function __cow_file_range_inline of the component btrfs. Executing a manipulation can lead to denial of service. This vulnerability appears as CVE-2025-71269. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 6.18.9. This vulnerability affects the function __cow_file_range_inline of the component btrfs. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: btrfs: do not free data reservation in fallback from inline due to -ENOSPC If we fail to create an inline extent due to -ENOSPC, we will attempt to go through the normal COW path, reserve an extent, create an ordered extent, etc. However we were always freeing the reserved qgroup data, which is wrong since we will use data. Fix this by freeing the reserved qgroup data in __cow_file_range_inline() only if we are not doing the fallback (ret is <= 0).

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2025-71269 since 03/17/2026. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 311783 (Debian dla-4561 : linux-config-6.1 - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.18.10 eliminates this vulnerability. Applying the patch 6de3a371a8b9fd095198b1aa68c22cc10a4c6961/f8da41de0bff9eb1d774a7253da0c9f637c4470a is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (311783) and CERT Bund (WID-SEC-2026-0790). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Google Cloud Platform
  • Ubuntu Linux
  • SUSE Linux
  • IGEL OS
  • WatchGuard Firebox
  • Open Source Linux Kernel

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 311783
Nessus Name: Debian dla-4561 : linux-config-6.1 - security update

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.10
Patch: 6de3a371a8b9fd095198b1aa68c22cc10a4c6961/f8da41de0bff9eb1d774a7253da0c9f637c4470a

Timelineinfo

03/17/2026 CVE reserved
03/18/2026 +1 days Advisory disclosed
03/18/2026 +0 days VulDB entry created
05/21/2026 +64 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-71269 (🔒)
GCVE (CVE): GCVE-0-2025-71269
GCVE (VulDB): GCVE-100-351568
CERT Bund: WID-SEC-2026-0790 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 03/18/2026 19:45
Updated: 05/21/2026 22:07
Changes: 03/18/2026 19:45 (58), 03/19/2026 19:09 (7), 03/24/2026 17:52 (1), 04/10/2026 09:27 (1), 05/03/2026 18:47 (2), 05/21/2026 22:07 (10)
Complete: 🔍
Cache ID: 216::103

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