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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.

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.

Detailed information about UBUNTU-CVE-2026-46175 affecting null linux-azure. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-46175 - Live Threat Intelligence - Threat Radar | OffSeq.com

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)

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