{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38652",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-38652"
  ],
  "published": "2025-08-22T16:01:13Z",
  "summary": "f2fs: fix to avoid out-of-boundary access in devs.path",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid out-of-boundary access in devs.path\n\n- touch /mnt/f2fs/012345678901234567890123456789012345678901234567890123\n- truncate -s $((1024*1024*1024)) \\\n  /mnt/f2fs/012345678901234567890123456789012345678901234567890123\n- touch /mnt/f2fs/file\n- truncate -s $((1024*1024*1024)) /mnt/f2fs/file\n- mkfs.f2fs /mnt/f2fs/012345678901234567890123456789012345678901234567890123 \\\n  -c /mnt/f2fs/file\n- mount /mnt/f2fs/012345678901234567890123456789012345678901234567890123 \\\n  /mnt/f2fs/loop\n\n[16937.192225] F2FS-fs (loop0): Mount Device [ 0]: /mnt/f2fs/012345678901234567890123456789012345678901234567890123\\xff\\x01,      511,        0 -    3ffff\n[16937.192268] F2FS-fs (loop0): Failed to find devices\n\nIf device path length equals to MAX_PATH_LEN, sbi->devs.path[] may\nnot end up w/ null character due to path array is fully filled, So\naccidently, fields locate after path[] may be treated as part of\ndevice path, result in parsing wrong device path.\n\nstruct f2fs_dev_info {\n...\n\tchar path[MAX_PATH_LEN];\n...\n};\n\nLet's add one byte space for sbi->devs.path[] to store null\ncharacter of device path string.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38652"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/dc0172c74bd9edaee7bea2ebb35f3dbd37a8ae80"
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      "url": "https://git.kernel.org/stable/c/1cf1ff15f262e8baf12201b270b6a79f9d119b2d"
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      "url": "https://git.kernel.org/stable/c/345fc8d1838f3f8be7c8ed08d86a13dedef67136"
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    {
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      "url": "https://git.kernel.org/stable/c/70849d33130a2cf1d6010069ed200669c8651fbd"
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      "url": "https://git.kernel.org/stable/c/755427093e4294ac111c3f9e40d53f681a0fbdaa"
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      "url": "https://git.kernel.org/stable/c/5661998536af52848cc4d52a377e90368196edea"
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    "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": 7.3,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The only trigger is `mount(2)` of a crafted f2fs image whose superblock `devs[].path` is a full 64 bytes with no terminator (`get_tree_bdev` \u2192 `f2fs_fill_super` \u2192 `f2fs_scan_devices`), and the resulting disclosure is read back locally via `/proc/fs/f2fs/<dev>/disk_map`. No network or peer-supplied data reaches this code; between Physical (removable media) and Local, the higher-severity Local applies.\nAC:L - The attacker fully controls the on-disk `f2fs_device.path[64]` bytes and the adjacent `total_segments` value, so filling the path completely deterministically leaves `sbi->devs[i].path` unterminated on every mount \u2014 exactly as the reporter demonstrated. There is no race, no memory-layout guessing, and the trailing struct fields (`start_blk`/`end_blk`) are deterministically derived from segment counts the attacker chooses.\nPR:N - The attacker needs no account or privileges on the victim system \u2014 only delivery of a malicious f2fs image on an SD card, USB stick, or disk image that a privileged auto-mount daemon (Android vold, udisks2) or administrator later processes, which is the most severe reasonable scenario for f2fs given its role as the standard Android/removable-media filesystem.\nUI:R - f2fs does not set `FS_USERNS_MOUNT`, so mounting requires `CAP_SYS_ADMIN` in the initial user namespace; the crafted image therefore reaches the vulnerable code only when a victim inserts the media or mounts the image, and that mount action constitutes user interaction.\nS:U - The over-read, the leaked slab contents, and any resulting fault all remain within the kernel's own security authority on the host performing the mount; no VM, container, or IOMMU boundary is crossed.\nC:H - The unterminated string is read until an arbitrary in-memory NUL, so the length is determined by heap contents rather than by any bound: the over-read spills into `total_segments`/`start_blk`/`end_blk`, into `nr_blkz` and the `blkz_seq` kernel heap pointer on zoned devices, and past the end of the `kzalloc`'d `f2fs_dev_info` array at its last element. Those bytes are printed verbatim into dmesg and exported through the world-readable 0444 `/proc/fs/f2fs/<dev>/disk_map`, so adjacent slab data and a kernel heap pointer (defeating KASLR) are disclosed to unprivileged userspace and can be re-read at will.\nI:L - The mis-parsed string is handed to `bdev_file_open_by_path()`, so f2fs can attach to and write filesystem data onto a block device whose path exceeds the 64-byte on-disk field \u2014 a target the format otherwise cannot name \u2014 corrupting that device's contents. There is no out-of-bounds write or attacker-controlled store, so the modification is limited rather than arbitrary.\nA:H - The strlen/vsnprintf walk past the end of the slab object faults hard on hardened configurations (KFENCE guard page, `panic_on_warn` with a KASAN slab-out-of-bounds report) and can read into unmapped memory at a slab-page boundary, oopsing the mounting task. Even without a fault, the mis-parsed device path aborts the mount with \"Failed to find devices\", leaving the volume \u2014 typically the device's primary Android/SD-card storage \u2014 unusable."
    }
  }
}
