In the Linux kernel, the following vulnerability has been resolved: btrfs: reject new transactions if the fs is fully read-only [BUG] There is a bug… (CVE-2026-23214)
A vulnerability in the Linux kernel's Btrfs file system was resolved that caused new transactions to be incorrectly accepted when the file system was fully read-only, leading to transaction aborts and kernel warnings. This bug could cause denial of service by aborting transactions. The issue affects multiple Linux kernel versions prior to 6.8.0-1055.56 and similar builds. A patch is available and included in updated Linux kernel packages. The vulnerability has a medium severity rating with a CVSS score of 5.5 and does not impact confidentiality or integrity but affects availability. No known exploits are reported in the wild. Users should update to the fixed kernel versions and reboot to apply the fix.
AI Analysis
Technical Summary
The Linux kernel Btrfs file system contained a bug where new transactions were not properly rejected when the file system was fully read-only, causing transaction aborts and kernel warnings during unmount operations. This issue was identified through fuzz testing and traced to the extent-tree management code. The vulnerability affects multiple Ubuntu Linux kernel versions prior to 6.8.0-1055.56 and related builds. The issue was fixed in updated kernel packages as part of a broader security update addressing multiple kernel subsystems. The CVSS 3.1 score is 5.5 (medium), reflecting local attack vector, low complexity, low privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, but high impact on availability. The vendor advisory from Ubuntu confirms the availability of patches and recommends updating and rebooting systems.
Potential Impact
This vulnerability impacts system availability by causing transaction aborts in the Btrfs file system when it is mounted fully read-only, potentially leading to denial of service conditions. There is no impact on confidentiality or integrity. The CVSS score of 5.5 reflects a medium severity with local attack vector and low complexity. No known exploits in the wild have been reported.
Mitigation Recommendations
A patch is available and has been released by Ubuntu in updated Linux kernel packages. Users should apply the standard system update and reboot to ensure the fix is applied. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. Follow vendor instructions for updating to the fixed kernel versions listed in the advisory. No additional mitigation steps are indicated by the vendor.
In the Linux kernel, the following vulnerability has been resolved: btrfs: reject new transactions if the fs is fully read-only [BUG] There is a bug… (CVE-2026-23214)
Description
A vulnerability in the Linux kernel's Btrfs file system was resolved that caused new transactions to be incorrectly accepted when the file system was fully read-only, leading to transaction aborts and kernel warnings. This bug could cause denial of service by aborting transactions. The issue affects multiple Linux kernel versions prior to 6.8.0-1055.56 and similar builds. A patch is available and included in updated Linux kernel packages. The vulnerability has a medium severity rating with a CVSS score of 5.5 and does not impact confidentiality or integrity but affects availability. No known exploits are reported in the wild. Users should update to the fixed kernel versions and reboot to apply the fix.
CVSS v3.1
Score 5.5medium
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 Linux kernel Btrfs file system contained a bug where new transactions were not properly rejected when the file system was fully read-only, causing transaction aborts and kernel warnings during unmount operations. This issue was identified through fuzz testing and traced to the extent-tree management code. The vulnerability affects multiple Ubuntu Linux kernel versions prior to 6.8.0-1055.56 and related builds. The issue was fixed in updated kernel packages as part of a broader security update addressing multiple kernel subsystems. The CVSS 3.1 score is 5.5 (medium), reflecting local attack vector, low complexity, low privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, but high impact on availability. The vendor advisory from Ubuntu confirms the availability of patches and recommends updating and rebooting systems.
Potential Impact
This vulnerability impacts system availability by causing transaction aborts in the Btrfs file system when it is mounted fully read-only, potentially leading to denial of service conditions. There is no impact on confidentiality or integrity. The CVSS score of 5.5 reflects a medium severity with local attack vector and low complexity. No known exploits in the wild have been reported.
Mitigation Recommendations
A patch is available and has been released by Ubuntu in updated Linux kernel packages. Users should apply the standard system update and reboot to ensure the fix is applied. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. Follow vendor instructions for updating to the fixed kernel versions listed in the advisory. No additional mitigation steps are indicated by the vendor.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-23214
- 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: 6a5b63002d1edb114c8a4841
Added to database: 07/18/2026, 11:26:56 UTC
Last enriched: 08/01/2026, 07:09:22 UTC
Last updated: 09/10/2026, 19:24:58 UTC
Views: 6
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