CVE-2025-38164

f2fs: zone: fix to avoid inconsistence in between SIT and SSA

State: Published
Severity: 7.1 High
Published: Jul 3, 2025
Updated: Aug 5, 2026
Reserved: Apr 16, 2025

Description

In the Linux kernel, the following vulnerability has been resolved:

f2fs: zone: fix to avoid inconsistence in between SIT and SSA

w/ below testcase, it will cause inconsistence in between SIT and SSA.

create_null_blk 512 2 1024 1024 mkfs.f2fs -m /dev/nullb0 mount /dev/nullb0 /mnt/f2fs/ touch /mnt/f2fs/file f2fs_io pinfile set /mnt/f2fs/file fallocate -l 4GiB /mnt/f2fs/file

F2FS-fs (nullb0): Inconsistent segment (0) type [1, 0] in SSA and SIT CPU: 5 UID: 0 PID: 2398 Comm: fallocate Tainted: G O 6.13.0-rc1 #84 Tainted: [O]=OOT_MODULE Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006 Call Trace: <TASK> dump_stack_lvl+0xb3/0xd0 dump_stack+0x14/0x20 f2fs_handle_critical_error+0x18c/0x220 [f2fs] f2fs_stop_checkpoint+0x38/0x50 [f2fs] do_garbage_collect+0x674/0x6e0 [f2fs] f2fs_gc_range+0x12b/0x230 [f2fs] f2fs_allocate_pinning_section+0x5c/0x150 [f2fs] f2fs_expand_inode_data+0x1cc/0x3c0 [f2fs] f2fs_fallocate+0x3c3/0x410 [f2fs] vfs_fallocate+0x15f/0x4b0 __x64_sys_fallocate+0x4a/0x80 x64_sys_call+0x15e8/0x1b80 do_syscall_64+0x68/0x130 entry_SYSCALL_64_after_hwframe+0x67/0x6f RIP: 0033:0x7f9dba5197ca F2FS-fs (nullb0): Stopped filesystem due to reason: 4

The reason is f2fs_gc_range() may try to migrate block in curseg, however, its SSA block is not uptodate due to the last summary block data is still in cache of curseg.

In this patch, we add a condition in f2fs_gc_range() to check whether section is opened or not, and skip block migration for opened section.

Scores

CVSS	Score	Vector	Source
3.1	7.1 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	40d76c393cca83938b11eb7ca8983aa3cd0ed69b to before d1365d2abfaf2d85ee51a005da3ca373aea97f6aAffected 9703d69d9d153bb230711d0d577454552aeb13d4 to before 44a51592ac657d8e422585414d7ec17a5b50fb0eAffected 9703d69d9d153bb230711d0d577454552aeb13d4 to before 8d9431b0d11a5030aa1ce477defee455b3821701Affected 9703d69d9d153bb230711d0d577454552aeb13d4 to before 773704c1ef96a8b70d0d186ab725f50548de82c4Affected 6.6.33 to before 6.6.130Affected
LinuxLinux	6.9Affected before 6.9Not affected 6.6.130 through 6.6.Not affected 6.12.34 through 6.12.Not affected 6.15.3 through 6.15.*Not affected 6.16 and laterNot affected

Product

Versions

LinuxLinux

40d76c393cca83938b11eb7ca8983aa3cd0ed69b to before d1365d2abfaf2d85ee51a005da3ca373aea97f6aAffected
9703d69d9d153bb230711d0d577454552aeb13d4 to before 44a51592ac657d8e422585414d7ec17a5b50fb0eAffected
9703d69d9d153bb230711d0d577454552aeb13d4 to before 8d9431b0d11a5030aa1ce477defee455b3821701Affected
9703d69d9d153bb230711d0d577454552aeb13d4 to before 773704c1ef96a8b70d0d186ab725f50548de82c4Affected
6.6.33 to before 6.6.130Affected

LinuxLinux

6.9Affected
before 6.9Not affected
6.6.130 through 6.6.*Not affected
6.12.34 through 6.12.*Not affected
6.15.3 through 6.15.*Not affected
6.16 and laterNot affected

References

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