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CVE-2026-46175

f2fs: fix fsck inconsistency caused by FGGC of node block PUBLISHED

Description (CNA)

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix fsck inconsistency caused by FGGC of node block During FGGC node block migration, fsck may incorrectly treat the migrated node block as fsync-written data. The reproduction scenario: root@vm:/mnt/f2fs# seq 1 2048 | xargs -n 1 ./test_sync // write inline inode and sync root@vm:/mnt/f2fs# rm -f 1 root@vm:/mnt/f2fs# sync root@vm:/mnt/f2fs# f2fs_io gc_range // move data block in sync mode and not write CP SPO, "fsck --dry-run" find inode has already checkpointed but still with DENT_BIT_SHIFT set The root cause is that GC does not clear the dentry mark and fsync mark during node block migration, leading fsck to misinterpret them as user-issued fsync writes. In BGGC mode, node block migration is handled by f2fs_sync_node_pages(), which guarantees the dentry and fsync marks are cleared before writing. This patch move the set/clear of the fsync|dentry marks into __write_node_folio to make the logic clearer, and ensures the fsync|dentry mark is cleared in FGGC.

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected da011cc0da8cf4a60ddf4d2ae8b42902a3d71e5f before d1820a5814eadb8e63ab6c7c8d04e28ce49836be; affected da011cc0da8cf4a60ddf4d2ae8b42902a3d71e5f before 8ac93964658d0649337dcb3f6e38d77f8cdd86f3; affected da011cc0da8cf4a60ddf4d2ae8b42902a3d71e5f before 8be551f538dc5b64183e27bd45a7a0795263f760; affected da011cc0da8cf4a60ddf4d2ae8b42902a3d71e5f before e7c6d30169b03307d27c4479563df79c08f3a746; affected da011cc0da8cf4a60ddf4d2ae8b42902a3d71e5f before c3e238bd1f56993f205ef83889d406dfeaf717a8
Linux / Linuxaffected 4.7; unaffected 0 before 4.7; unaffected 6.6.160 through 6.6.*; unaffected 6.12.114 through 6.12.*; unaffected 6.18.30 through 6.18.*; unaffected 7.0.7 through 7.0.*; unaffected 7.1 through *

CWE

No CWE identifiers supplied.

References