{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38677",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-38677"
  ],
  "published": "2025-08-30T09:19:17Z",
  "summary": "f2fs: fix to avoid out-of-boundary access in dnode page",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid out-of-boundary access in dnode page\n\nAs Jiaming Zhang reported:\n\n <TASK>\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x1c1/0x2a0 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0x17e/0x800 mm/kasan/report.c:480\n kasan_report+0x147/0x180 mm/kasan/report.c:593\n data_blkaddr fs/f2fs/f2fs.h:3053 [inline]\n f2fs_data_blkaddr fs/f2fs/f2fs.h:3058 [inline]\n f2fs_get_dnode_of_data+0x1a09/0x1c40 fs/f2fs/node.c:855\n f2fs_reserve_block+0x53/0x310 fs/f2fs/data.c:1195\n prepare_write_begin fs/f2fs/data.c:3395 [inline]\n f2fs_write_begin+0xf39/0x2190 fs/f2fs/data.c:3594\n generic_perform_write+0x2c7/0x910 mm/filemap.c:4112\n f2fs_buffered_write_iter fs/f2fs/file.c:4988 [inline]\n f2fs_file_write_iter+0x1ec8/0x2410 fs/f2fs/file.c:5216\n new_sync_write fs/read_write.c:593 [inline]\n vfs_write+0x546/0xa90 fs/read_write.c:686\n ksys_write+0x149/0x250 fs/read_write.c:738\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xf3/0x3d0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nThe root cause is in the corrupted image, there is a dnode has the same\nnode id w/ its inode, so during f2fs_get_dnode_of_data(), it tries to\naccess block address in dnode at offset 934, however it parses the dnode\nas inode node, so that get_dnode_addr() returns 360, then it tries to\naccess page address from 360 + 934 * 4 = 4096 w/ 4 bytes.\n\nTo fix this issue, let's add sanity check for node id of all direct nodes\nduring f2fs_get_dnode_of_data().",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38677"
    },
    {
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      "url": "https://git.kernel.org/stable/c/ee4d13f5407cbdf1216cc258f45492075713889a"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable path is reached through a local `write(2)`/`vfs_write` syscall on a file of a mounted f2fs filesystem, with no network component. Local access to the mount is required, so Attack Vector is Local.\nAC:L - Given a crafted f2fs image (a direct-node nid equal to the inode's own nid), the out-of-bounds access is fully deterministic \u2014 the attacker selects the OOB offset simply by choosing the file offset to write, and there is no race or unpredictable memory-layout precondition.\nPR:L - No capability or privilege check exists between the write syscall and `f2fs_get_dnode_of_data()`; any unprivileged user with access to the mounted (attacker-supplied or corrupted) f2fs volume can trigger it, matching the Android/removable-media deployment model where f2fs volumes are user-accessible.\nUI:N - Once the crafted image is present/mounted \u2014 commonly automatic via udisks2/vold-style auto-mount of removable media \u2014 the attacker triggers the bug entirely on their own with ordinary file writes, requiring no action from another user.\nS:U - The out-of-bounds access corrupts kernel memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `data_blkaddr()` performs an out-of-bounds read of up to ~336 bytes past the node page at 84 attacker-chosen 4-byte offsets, and the leaked values are surfaced to userspace as block addresses via FIBMAP/FIEMAP (`f2fs_bmap`); the accompanying heap corruption further enables information disclosure.\nI:H - `__set_data_blkaddr()` writes 4 bytes (`NEW_ADDR`, and later real block addresses) at the same out-of-bounds offset, giving an out-of-bounds write into memory adjacent to a page-cache page at attacker-selected offsets \u2014 a heap-corruption primitive suitable for control-flow hijacking.\nA:H - The bug reproduces as a KASAN-reported out-of-bounds access; corrupting adjacent kernel page/slab memory readily causes an oops or panic, and the condition is repeatedly triggerable."
    }
  }
}