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vuln-cve/data/2025/38xxx/CVE-2025-38218.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2025-38218",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2025-04-16T04:51:23.995Z",
"datePublished": "2025-07-04T13:37:35.157Z",
"dateUpdated": "2026-08-05T12:00:26.742Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T12:00:26.742Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to do sanity check on sit_bitmap_size\n\nw/ below testcase, resize will generate a corrupted image which\ncontains inconsistent metadata, so when mounting such image, it\nwill trigger kernel panic:\n\ntouch img\ntruncate -s $((512*1024*1024*1024)) img\nmkfs.f2fs -f img $((256*1024*1024))\nresize.f2fs -s -i img -t $((1024*1024*1024))\nmount img /mnt/f2fs\n\n------------[ cut here ]------------\nkernel BUG at fs/f2fs/segment.h:863!\nOops: invalid opcode: 0000 [#1] SMP PTI\nCPU: 11 UID: 0 PID: 3922 Comm: mount Not tainted 6.15.0-rc1+ #191 PREEMPT(voluntary)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\nRIP: 0010:f2fs_ra_meta_pages+0x47c/0x490\n\nCall Trace:\n f2fs_build_segment_manager+0x11c3/0x2600\n f2fs_fill_super+0xe97/0x2840\n mount_bdev+0xf4/0x140\n legacy_get_tree+0x2b/0x50\n vfs_get_tree+0x29/0xd0\n path_mount+0x487/0xaf0\n __x64_sys_mount+0x116/0x150\n do_syscall_64+0x82/0x190\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\nRIP: 0033:0x7fdbfde1bcfe\n\nThe reaseon is:\n\nsit_i->bitmap_size is 192, so size of sit bitmap is 192*8=1536, at maximum\nthere are 1536 sit blocks, however MAIN_SEGS is 261893, so that sit_blk_cnt\nis 4762, build_sit_entries() -> current_sit_addr() tries to access\nout-of-boundary in sit_bitmap at offset from [1536, 4762), once sit_bitmap\nand sit_bitmap_mirror is not the same, it will trigger f2fs_bug_on().\n\nLet's add sanity check in f2fs_sanity_check_ckpt() to avoid panic."
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The vulnerability is reached through the local `mount(2)` path (`f2fs_fill_super` → `f2fs_build_segment_manager` → `build_sit_entries`) when a crafted f2fs image is attached, and the subsequent OOB write is reached via ordinary local file writes triggering a checkpoint. No network exposure exists.\nAC:L - The attacker fully controls the on-disk `sit_ver_bitmap_bytesize` and `segment_count_main` fields, so the out-of-bounds offset is deterministic and reproducible on every mount — the PoC is four shell commands with no race, timing, or memory-layout luck required to trigger it.\nPR:L - An unprivileged local user can get the crafted image mounted through removable-media auto-mount paths that are ubiquitous for f2fs — Android vold mounting SD/adoptable storage and udisks2 on desktops — without holding real `CAP_SYS_ADMIN` in the init namespace.\nUI:N - The attacker supplies and mounts the image themselves via auto-mount or delegated mount rights; no action by a separate victim user is needed, and the follow-on OOB write in `f2fs_flush_sit_entries()` fires from the attacker's own writes.\nS:U - The out-of-bounds access corrupts kernel slab memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `current_sit_addr()` performs a heap out-of-bounds read of the `kmemdup`'d `sit_bitmap` at an attacker-chosen offset extending thousands of bits (up to ~19 KB) past the slab object, and the values read steer computed metadata block addresses, providing an oracle over adjacent kernel heap contents.\nI:H - `f2fs_flush_sit_entries()` → `get_next_sit_folio()` → `set_to_next_sit()` → `f2fs_change_bit()` performs an out-of-bounds bit flip at the same attacker-chosen offset, corrupting adjacent slab objects — a heap-corruption primitive suitable for control-flow hijacking with standard grooming.\nA:H - The reported impact is an immediate kernel panic — `BUG()` via `f2fs_bug_on()` at `fs/f2fs/segment.h:863` inside `f2fs_ra_meta_pages()` during mount — and the far out-of-bounds accesses can also fault on unmapped memory."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/f2fs/super.c"
],
"versions": [
{
"version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4",
"lessThan": "82f51bff393e4c12cf4de553120ca831cfa4ef19",
"status": "affected",
"versionType": "git"
},
{
"version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4",
"lessThan": "38ef48a8afef8df646b6f6ae7abb872f18b533c1",
"status": "affected",
"versionType": "git"
},
{
"version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4",
"lessThan": "ad862f71016ba38039df1c96ed55c0a4314cc183",
"status": "affected",
"versionType": "git"
},
{
"version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4",
"lessThan": "79ef8a6c4ec53d327580fd7d2b522cf4f1d05b0c",
"status": "affected",
"versionType": "git"
},
{
"version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4",
"lessThan": "ee1b421c469876544e297ec1090574bd76100247",
"status": "affected",
"versionType": "git"
},
{
"version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4",
"lessThan": "3e5ac62a56a24f4d88ce8ffd7bc452428b235868",
"status": "affected",
"versionType": "git"
},
{
"version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4",
"lessThan": "5db0d252c64e91ba1929c70112352e85dc5751e7",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/f2fs/super.c"
],
"versions": [
{
"version": "3.8",
"status": "affected"
},
{
"version": "0",
"lessThan": "3.8",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.239",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.186",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.142",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.95",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.35",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.15.4",
"lessThanOrEqual": "6.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.16",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.8",
"versionEndExcluding": "5.10.239"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.8",
"versionEndExcluding": "5.15.186"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.8",
"versionEndExcluding": "6.1.142"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.8",
"versionEndExcluding": "6.6.95"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.8",
"versionEndExcluding": "6.12.35"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.8",
"versionEndExcluding": "6.15.4"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.8",
"versionEndExcluding": "6.16"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/82f51bff393e4c12cf4de553120ca831cfa4ef19"
},
{
"url": "https://git.kernel.org/stable/c/38ef48a8afef8df646b6f6ae7abb872f18b533c1"
},
{
"url": "https://git.kernel.org/stable/c/ad862f71016ba38039df1c96ed55c0a4314cc183"
},
{
"url": "https://git.kernel.org/stable/c/79ef8a6c4ec53d327580fd7d2b522cf4f1d05b0c"
},
{
"url": "https://git.kernel.org/stable/c/ee1b421c469876544e297ec1090574bd76100247"
},
{
"url": "https://git.kernel.org/stable/c/3e5ac62a56a24f4d88ce8ffd7bc452428b235868"
},
{
"url": "https://git.kernel.org/stable/c/5db0d252c64e91ba1929c70112352e85dc5751e7"
}
],
"title": "f2fs: fix to do sanity check on sit_bitmap_size",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
{
"title": "CVE Program Container",
"references": [
{
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
},
{
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
}
],
"providerMetadata": {
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE",
"dateUpdated": "2025-11-03T17:35:36.324Z"
}
}
]
}
}
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