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… (CVE-2025-71269)
A vulnerability in the Linux kernel's Btrfs file system was resolved that involved improper freeing of reserved quota group data during fallback from inline extent creation when encountering a -ENOSPC error. This flaw could lead to a denial of service by causing system instability or crashes. The issue affects multiple Ubuntu Linux kernel versions prior to 6.8.0-1061.64~22.04.1 and related builds. A patch is available and should be applied via standard system updates followed by a reboot. The update requires recompilation of third-party kernel modules due to an ABI change. No known exploits are reported in the wild.
AI Analysis
Technical Summary
The vulnerability (CVE-2025-71269) in the Linux kernel's Btrfs file system occurs when an attempt to create an inline extent fails with a -ENOSPC (no space) error. The kernel then falls back to the normal copy-on-write (COW) path, reserving an extent and creating an ordered extent. However, the reserved quota group data was always freed incorrectly, even though it would be used in the fallback path. This improper freeing could cause resource mismanagement leading to potential denial of service (system instability or crash). The issue affects Ubuntu Linux kernel versions prior to 6.8.0-1061.64~22.04.1 and similar versions. The vulnerability has a CVSS 3.1 score of 7.5 (medium severity) with network attack vector, low attack complexity, no privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, but high impact on availability. A patch is available and included in Ubuntu security notices USN-8567-1 and USN-8574-1. Users must update and reboot their systems. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled.
Potential Impact
This vulnerability can cause a denial of service by improper handling of quota group data during fallback from inline extent creation in the Btrfs file system. The impact is limited to availability, with no direct confidentiality or integrity loss. No known exploits exist in the wild. The vulnerability can be triggered remotely as the CVSS vector indicates network attack vector with no privileges or user interaction required, increasing the risk of disruption in affected systems.
Mitigation Recommendations
A patch is available and should be applied promptly by updating the Linux kernel to versions 6.8.0-1061.64~22.04.1 or later as provided by the vendor. After updating, a system reboot is required to activate the fix. Due to an ABI change in the kernel update, all third-party kernel modules must be recompiled and reinstalled to ensure compatibility. Follow the vendor's official update instructions as detailed in Ubuntu security notices USN-8567-1 and USN-8574-1. No additional mitigations are specified or required.
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… (CVE-2025-71269)
Description
A vulnerability in the Linux kernel's Btrfs file system was resolved that involved improper freeing of reserved quota group data during fallback from inline extent creation when encountering a -ENOSPC error. This flaw could lead to a denial of service by causing system instability or crashes. The issue affects multiple Ubuntu Linux kernel versions prior to 6.8.0-1061.64~22.04.1 and related builds. A patch is available and should be applied via standard system updates followed by a reboot. The update requires recompilation of third-party kernel modules due to an ABI change. No known exploits are reported in the wild.
CVSS v3.1
Score 7.5high
Affected software
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protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability (CVE-2025-71269) in the Linux kernel's Btrfs file system occurs when an attempt to create an inline extent fails with a -ENOSPC (no space) error. The kernel then falls back to the normal copy-on-write (COW) path, reserving an extent and creating an ordered extent. However, the reserved quota group data was always freed incorrectly, even though it would be used in the fallback path. This improper freeing could cause resource mismanagement leading to potential denial of service (system instability or crash). The issue affects Ubuntu Linux kernel versions prior to 6.8.0-1061.64~22.04.1 and similar versions. The vulnerability has a CVSS 3.1 score of 7.5 (medium severity) with network attack vector, low attack complexity, no privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, but high impact on availability. A patch is available and included in Ubuntu security notices USN-8567-1 and USN-8574-1. Users must update and reboot their systems. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled.
Potential Impact
This vulnerability can cause a denial of service by improper handling of quota group data during fallback from inline extent creation in the Btrfs file system. The impact is limited to availability, with no direct confidentiality or integrity loss. No known exploits exist in the wild. The vulnerability can be triggered remotely as the CVSS vector indicates network attack vector with no privileges or user interaction required, increasing the risk of disruption in affected systems.
Mitigation Recommendations
A patch is available and should be applied promptly by updating the Linux kernel to versions 6.8.0-1061.64~22.04.1 or later as provided by the vendor. After updating, a system reboot is required to activate the fix. Due to an ABI change in the kernel update, all third-party kernel modules must be recompiled and reinstalled to ensure compatibility. Follow the vendor's official update instructions as detailed in Ubuntu security notices USN-8567-1 and USN-8574-1. No additional mitigations are specified or required.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2025-71269
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10"]
- Cvss Version
- 3.1
Threat ID: 6a5b63932d1edb114c8b75d6
Added to database: 07/18/2026, 11:29:23 UTC
Last enriched: 08/01/2026, 23:32:47 UTC
Last updated: 09/14/2026, 22:01:31 UTC
Views: 16
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