CVE - CVE-2025-38218

CVE-ID
CVE-2025-38218	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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 $((512102410241024)) img mkfs.f2fs -f img $((25610241024)) resize.f2fs -s -i img -t $((102410241024)) 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 1928=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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/38ef48a8afef8df646b6f6ae7abb872f18b533c1 URL:https://git.kernel.org/stable/c/38ef48a8afef8df646b6f6ae7abb872f18b533c1 MISC:https://git.kernel.org/stable/c/3e5ac62a56a24f4d88ce8ffd7bc452428b235868 URL:https://git.kernel.org/stable/c/3e5ac62a56a24f4d88ce8ffd7bc452428b235868 MISC:https://git.kernel.org/stable/c/5db0d252c64e91ba1929c70112352e85dc5751e7 URL:https://git.kernel.org/stable/c/5db0d252c64e91ba1929c70112352e85dc5751e7 MISC:https://git.kernel.org/stable/c/79ef8a6c4ec53d327580fd7d2b522cf4f1d05b0c URL:https://git.kernel.org/stable/c/79ef8a6c4ec53d327580fd7d2b522cf4f1d05b0c MISC:https://git.kernel.org/stable/c/82f51bff393e4c12cf4de553120ca831cfa4ef19 URL:https://git.kernel.org/stable/c/82f51bff393e4c12cf4de553120ca831cfa4ef19 MISC:https://git.kernel.org/stable/c/ad862f71016ba38039df1c96ed55c0a4314cc183 URL:https://git.kernel.org/stable/c/ad862f71016ba38039df1c96ed55c0a4314cc183 MISC:https://git.kernel.org/stable/c/ee1b421c469876544e297ec1090574bd76100247 URL:https://git.kernel.org/stable/c/ee1b421c469876544e297ec1090574bd76100247
Assigning CNA
kernel.org
Date Record Created
20250416	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20250416)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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