In the Linux kernel, the following vulnerability has been resolved: btrfs: do not strictly require dirty metadata threshold for metadata writepages… (CVE-2026-23157)
A medium severity vulnerability (CVE-2026-23157) in the Linux kernel's BTRFS file system was resolved. The issue involved processes hanging in the balance_dirty_pages() function due to strict enforcement of dirty metadata thresholds, potentially causing system hangs and kernel core dumps. This flaw affects upstream Linux kernels before version 6.18. A patch is available, and users are advised to update to fixed kernel versions. The vulnerability does not impact confidentiality or integrity but can cause denial of service through system hangs.
AI Analysis
Technical Summary
CVE-2026-23157 is a vulnerability in the Linux kernel's BTRFS file system where over 1000 processes can become stuck waiting in io_schedule_timeout() within balance_dirty_pages(), leading to system hangs and kernel core dumps. The root cause is related to the strict requirement of dirty metadata thresholds during metadata writepages, particularly affecting cgroups with small memory allocations and their dirty limits. This results in excessive dirty throttling and task blocking. The issue affects all upstream kernels before version 6.18 and was resolved in kernel 6.18 and later. The vulnerability is rated medium severity with a CVSS score of 5.5 (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Potential Impact
The vulnerability can cause denial of service by hanging the system and triggering kernel core dumps due to many processes waiting indefinitely in the dirty page balancing mechanism. There is no impact on confidentiality or integrity. The issue affects system availability.
Mitigation Recommendations
A patch is available and has been incorporated in Linux kernel version 6.18 and later. Users should update their Linux kernel to version 6.18 or newer to remediate this issue. For Ubuntu users, updated kernel packages are available as per Ubuntu Security Notices USN-8570-1 and USN-8567-1. After updating, a system reboot is required. Note that due to ABI changes, third-party kernel modules may need recompilation and reinstallation.
In the Linux kernel, the following vulnerability has been resolved: btrfs: do not strictly require dirty metadata threshold for metadata writepages… (CVE-2026-23157)
Description
A medium severity vulnerability (CVE-2026-23157) in the Linux kernel's BTRFS file system was resolved. The issue involved processes hanging in the balance_dirty_pages() function due to strict enforcement of dirty metadata thresholds, potentially causing system hangs and kernel core dumps. This flaw affects upstream Linux kernels before version 6.18. A patch is available, and users are advised to update to fixed kernel versions. The vulnerability does not impact confidentiality or integrity but can cause denial of service through system hangs.
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
CVE-2026-23157 is a vulnerability in the Linux kernel's BTRFS file system where over 1000 processes can become stuck waiting in io_schedule_timeout() within balance_dirty_pages(), leading to system hangs and kernel core dumps. The root cause is related to the strict requirement of dirty metadata thresholds during metadata writepages, particularly affecting cgroups with small memory allocations and their dirty limits. This results in excessive dirty throttling and task blocking. The issue affects all upstream kernels before version 6.18 and was resolved in kernel 6.18 and later. The vulnerability is rated medium severity with a CVSS score of 5.5 (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Potential Impact
The vulnerability can cause denial of service by hanging the system and triggering kernel core dumps due to many processes waiting indefinitely in the dirty page balancing mechanism. There is no impact on confidentiality or integrity. The issue affects system availability.
Mitigation Recommendations
A patch is available and has been incorporated in Linux kernel version 6.18 and later. Users should update their Linux kernel to version 6.18 or newer to remediate this issue. For Ubuntu users, updated kernel packages are available as per Ubuntu Security Notices USN-8570-1 and USN-8567-1. After updating, a system reboot is required. Note that due to ABI changes, third-party kernel modules may need recompilation and reinstallation.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-23157
- 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: 6a5b63242d1edb114c8ad3b3
Added to database: 07/18/2026, 11:27:32 UTC
Last enriched: 08/22/2026, 20:57:19 UTC
Last updated: 09/10/2026, 19:24:58 UTC
Views: 8
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