CVE-2026-46175

published 2026-05-28

CVE-2026-46175: 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…

high 7.1 CVSS 3.1

AV L AC L PR L UI N S U C N I H A H

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

5 ranges

Vendor	Product	Version range	Fixed in
linux	linux	—	—
linux	linux	>= da011cc0da8cf4a60ddf4d2ae8b42902a3d71e5f < 8be551f538dc5b64183e27bd45a7a0795263f760	8be551f538dc5b64183e27bd45a7a0795263f760
linux	linux	>= da011cc0da8cf4a60ddf4d2ae8b42902a3d71e5f < e7c6d30169b03307d27c4479563df79c08f3a746	e7c6d30169b03307d27c4479563df79c08f3a746
linux	linux	>= da011cc0da8cf4a60ddf4d2ae8b42902a3d71e5f < c3e238bd1f56993f205ef83889d406dfeaf717a8	c3e238bd1f56993f205ef83889d406dfeaf717a8
linux	linux_kernel	—	—

CWE-911