CVE-2025-38218
published 2025-07-04CVE-2025-38218: In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to do sanity check on sit_bitmap_size w/ below testcase, resize will generate a…
medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
In the Linux kernel, the following vulnerability has been resolved:
f2fs: fix to do sanity check on sit_bitmap_size
w/ below testcase, resize will generate a corrupted image which
contains inconsistent metadata, so when mounting such image, it
will trigger kernel panic:
touch img
truncate -s $((512*1024*1024*1024)) img
mkfs.f2fs -f img $((256*1024*1024))
resize.f2fs -s -i img -t $((1024*1024*1024))
mount img /mnt/f2fs
------------[ cut here ]------------
kernel BUG at fs/f2fs/segment.h:863!
Oops: invalid opcode: 0000 [#1] SMP PTI
CPU: 11 UID: 0 PID: 3922 Comm: mount Not tainted 6.15.0-rc1+ #191 PREEMPT(voluntary)
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:f2fs_ra_meta_pages+0x47c/0x490
Call Trace:
f2fs_build_segment_manager+0x11c3/0x2600
f2fs_fill_super+0xe97/0x2840
mount_bdev+0xf4/0x140
legacy_get_tree+0x2b/0x50
vfs_get_tree+0x29/0xd0
path_mount+0x487/0xaf0
__x64_sys_mount+0x116/0x150
do_syscall_64+0x82/0x190
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fdbfde1bcfe
The reaseon is:
sit_i->bitmap_size is 192, so size of sit bitmap is 192*8=1536, at maximum
there are 1536 sit blocks, however MAIN_SEGS is 261893, so that sit_blk_cnt
is 4762, build_sit_entries() -> current_sit_addr() tries to access
out-of-boundary in sit_bitmap at offset from [1536, 4762), once sit_bitmap
and sit_bitmap_mirror is not the same, it will trigger f2fs_bug_on().
Let's add sanity check in f2fs_sanity_check_ckpt() to avoid panic.
Affected
33 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | debian_linux | — | — |
| debian | linux | < linux 6.1.147-1 (bookworm) | linux 6.1.147-1 (bookworm) |
| debian | linux-6.1 | < linux 6.1.147-1 (bookworm) | linux 6.1.147-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | >= 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 < 82f51bff393e4c12cf4de553120ca831cfa4ef19 | 82f51bff393e4c12cf4de553120ca831cfa4ef19 |
| linux | linux | >= 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 < 38ef48a8afef8df646b6f6ae7abb872f18b533c1 | 38ef48a8afef8df646b6f6ae7abb872f18b533c1 |
| linux | linux | >= 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 < ad862f71016ba38039df1c96ed55c0a4314cc183 | ad862f71016ba38039df1c96ed55c0a4314cc183 |
| linux | linux | >= 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 < 79ef8a6c4ec53d327580fd7d2b522cf4f1d05b0c | 79ef8a6c4ec53d327580fd7d2b522cf4f1d05b0c |
| linux | linux | >= 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 < ee1b421c469876544e297ec1090574bd76100247 | ee1b421c469876544e297ec1090574bd76100247 |
| linux | linux | >= 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 < 3e5ac62a56a24f4d88ce8ffd7bc452428b235868 | 3e5ac62a56a24f4d88ce8ffd7bc452428b235868 |
| linux | linux | >= 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 < 5db0d252c64e91ba1929c70112352e85dc5751e7 | 5db0d252c64e91ba1929c70112352e85dc5751e7 |
| linux | linux_kernel | >= 0 < 5.10.244-1 | 5.10.244-1 |
| linux | linux_kernel | >= 0 < 6.1.147-1 | 6.1.147-1 |
| linux | linux_kernel | >= 0 < 6.12.35-1 | 6.12.35-1 |
| linux | linux_kernel | >= 0 < 6.12.35-1 | 6.12.35-1 |
| linux | linux_kernel | >= 0 < 5.15.0-156.166 | 5.15.0-156.166 |
| linux | linux_kernel | >= 0 < 6.8.0-100.100 | 6.8.0-100.100 |
| linux | linux_kernel | >= 3.8 < 5.10.239 | 5.10.239 |
| linux | linux_kernel | >= 5.11 < 5.15.186 | 5.15.186 |
| linux | linux_kernel | >= 5.16 < 6.1.142 | 6.1.142 |
| linux | linux_kernel | >= 6.13 < 6.15.4 | 6.15.4 |
| linux | linux_kernel | >= 6.2 < 6.6.95 | 6.6.95 |
| linux | linux_kernel | >= 6.7 < 6.12.35 | 6.12.35 |
| msrc | azl3_kernel_6.6.92.2-2_on_azure_linux_3.0 | — | — |
| ubuntu | linux-aws | — | — |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.6MEDIUM