Linux azure: In the Linux kernel, the following vulnerability has been resolved: f2fs: fix fsck inconsistency caused by FGGC of node block During FGGC node block… (CVE-2026-46175)
A vulnerability in the Linux kernel's f2fs filesystem caused fsck to incorrectly treat migrated node blocks as fsync-written data due to improper clearing of dentry and fsync marks during node block migration. This inconsistency could lead to filesystem corruption or denial of service. The issue has been fixed in updated Linux kernel versions.
AI Analysis
Technical Summary
CVE-2026-46175 addresses a flaw in the Linux kernel's f2fs filesystem where the garbage collection (FGGC) of node blocks did not clear dentry and fsync marks properly during migration. This caused the filesystem check utility (fsck) to misinterpret migrated node blocks as fsync-written data, leading to inconsistencies during filesystem checks. The patch moves the set/clear logic of these marks into __write_node_folio to ensure correctness. The vulnerability affects multiple linux-azure kernel versions prior to 7.0.0-28.28~24.04.1 and related versions. The fix is included in updated kernel packages as per Ubuntu advisories USN-8566-1 and USN-8568-1.
Potential Impact
The vulnerability can cause fsck to incorrectly interpret filesystem state, potentially leading to filesystem inconsistencies or denial of service. The CVSS score of 7.1 indicates a high impact on integrity and availability, though no confidentiality impact is noted. There are no known exploits in the wild. The issue requires local privileges to exploit (AV:L) and low attack complexity (AC:L).
Mitigation Recommendations
A patch is available and should be applied by updating to the fixed Linux kernel versions listed in the Ubuntu security advisories USN-8566-1 and USN-8568-1. After updating, a system reboot is required. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled. Follow the vendor's update instructions carefully to ensure full remediation.
Linux azure: In the Linux kernel, the following vulnerability has been resolved: f2fs: fix fsck inconsistency caused by FGGC of node block During FGGC node block… (CVE-2026-46175)
Description
A vulnerability in the Linux kernel's f2fs filesystem caused fsck to incorrectly treat migrated node blocks as fsync-written data due to improper clearing of dentry and fsync marks during node block migration. This inconsistency could lead to filesystem corruption or denial of service. The issue has been fixed in updated Linux kernel versions.
CVSS v3.1
Score 7.1high
Affected software
pkg:deb/ubuntu/[email protected]~14.04.1?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.2?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.2?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips-updates/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips-updates/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips-updates/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips-updates/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips/bionicpkg:deb/ubuntu/[email 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Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-46175 addresses a flaw in the Linux kernel's f2fs filesystem where the garbage collection (FGGC) of node blocks did not clear dentry and fsync marks properly during migration. This caused the filesystem check utility (fsck) to misinterpret migrated node blocks as fsync-written data, leading to inconsistencies during filesystem checks. The patch moves the set/clear logic of these marks into __write_node_folio to ensure correctness. The vulnerability affects multiple linux-azure kernel versions prior to 7.0.0-28.28~24.04.1 and related versions. The fix is included in updated kernel packages as per Ubuntu advisories USN-8566-1 and USN-8568-1.
Potential Impact
The vulnerability can cause fsck to incorrectly interpret filesystem state, potentially leading to filesystem inconsistencies or denial of service. The CVSS score of 7.1 indicates a high impact on integrity and availability, though no confidentiality impact is noted. There are no known exploits in the wild. The issue requires local privileges to exploit (AV:L) and low attack complexity (AC:L).
Mitigation Recommendations
A patch is available and should be applied by updating to the fixed Linux kernel versions listed in the Ubuntu security advisories USN-8566-1 and USN-8568-1. After updating, a system reboot is required. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled. Follow the vendor's update instructions carefully to ensure full remediation.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-46175
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu: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","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
Threat ID: 6a5a01d891ae9bcd3f82cbbb
Added to database: 07/17/2026, 10:20:08 UTC
Last enriched: 09/08/2026, 00:31:14 UTC
Last updated: 09/14/2026, 22:01:34 UTC
Views: 20
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